This document outlines Tibor Astrab's investigation of simple harmonic motion. The experiment involves attaching different masses to a spring and measuring how the spring's oscillations change. Key points covered include:
1) The background physics of simple harmonic motion, including the exchange of potential and kinetic energy during oscillations and relevant equations.
2) The preliminary apparatus, method, and risk assessment, which will use similar equipment to the full experiment but with less precision.
3) Plans to measure the spring's stiffness constant and the effect of mass on the oscillation period.
4) Preliminary expectations for results graphs and evaluations of measurements.
5) An outline of the main apparatus, method, and risk assessment
This document contains the instructions for three experiments:
1) To compare the reactivity of alkali metals towards oxygen by observing their reactions in different sets. Students are asked to record observations, make predictions, and analyze pH changes.
2) To determine the reaction between barium chloride and potassium chromate solutions by measuring precipitate formation at different volumes. Students must complete a table of results and draw a graph to identify the reacting quantities.
3) To investigate the effect of zinc size on its reaction rate with sulfuric acid by developing a full experiment plan outlining the problem, hypothesis, variables, materials, procedure, and method of collecting data.
1) The document discusses electromagnetism and how magnetic fields can be produced by electric currents in wires and coils. It explains concepts like the right-hand grip rule and how magnetic fields are oriented.
2) Factors that affect the strength of electromagnets are discussed, including the number of turns in the coil, the electric current, and whether an iron core is used. Soft iron cores produce stronger magnetic fields.
3) Examples of applications of electromagnets are given, including electric bells, electromagnetic relays, and telephone earpieces. The working principles of these devices rely on magnetizing soft iron components using electric currents.
The document discusses integration and indefinite integrals. It covers determining integrals by reversing differentiation, integrating algebraic expressions like constants, variables, and polynomials. It also discusses determining the constant of integration and using integration to find equations of curves from their gradients. Examples are provided to illustrate integrating functions and finding volumes generated by rotating an area about an axis.
Alpha decay - physical background and practical applicationsAndrii Sofiienko
This document provides background information on alpha decay, including its discovery, experimental observations, and theoretical explanations. It discusses how alpha decay was first observed in uranium salts and describes the four main types of radioactivity. The document outlines experiments showing that alpha particles have a charge of +2 and consist of two protons and two neutrons. It also summarizes George Gamow's 1928 quantum tunneling theory of alpha decay, which explained how alpha particles can escape the nucleus despite facing a Coulomb barrier. The theory predicts the relationship between half-life and emission energy that had previously been observed empirically.
Dokumen tersebut membahas tentang teori kesetimbangan, dinamika rotasi, dan titik berat kesetimbangan. Terdapat berbagai jenis kesetimbangan berdasarkan posisi dan keadaan benda, serta penjelasan mengenai momen gaya, momen inersia, dan hubungan antara gerak translasi dan rotasi.
This document provides an introduction to thermochemistry and the key concepts of enthalpy, enthalpy change, and standard enthalpy of formation. It defines system and surroundings, and the three types of systems - open, closed, and isolated. The key points are:
- Enthalpy change (ΔH) is the difference in enthalpies between products and reactants and indicates whether a reaction is endothermic or exothermic.
- Standard enthalpy of formation (H°f) is the enthalpy change when 1 mole of a substance is formed from its elements under standard conditions.
- Enthalpy of combustion (H°c) is the enthalpy change when 1 mole
This document contains the instructions for three experiments:
1) To compare the reactivity of alkali metals towards oxygen by observing their reactions in different sets. Students are asked to record observations, make predictions, and analyze pH changes.
2) To determine the reaction between barium chloride and potassium chromate solutions by measuring precipitate formation at different volumes. Students must complete a table of results and draw a graph to identify the reacting quantities.
3) To investigate the effect of zinc size on its reaction rate with sulfuric acid by developing a full experiment plan outlining the problem, hypothesis, variables, materials, procedure, and method of collecting data.
1) The document discusses electromagnetism and how magnetic fields can be produced by electric currents in wires and coils. It explains concepts like the right-hand grip rule and how magnetic fields are oriented.
2) Factors that affect the strength of electromagnets are discussed, including the number of turns in the coil, the electric current, and whether an iron core is used. Soft iron cores produce stronger magnetic fields.
3) Examples of applications of electromagnets are given, including electric bells, electromagnetic relays, and telephone earpieces. The working principles of these devices rely on magnetizing soft iron components using electric currents.
The document discusses integration and indefinite integrals. It covers determining integrals by reversing differentiation, integrating algebraic expressions like constants, variables, and polynomials. It also discusses determining the constant of integration and using integration to find equations of curves from their gradients. Examples are provided to illustrate integrating functions and finding volumes generated by rotating an area about an axis.
Alpha decay - physical background and practical applicationsAndrii Sofiienko
This document provides background information on alpha decay, including its discovery, experimental observations, and theoretical explanations. It discusses how alpha decay was first observed in uranium salts and describes the four main types of radioactivity. The document outlines experiments showing that alpha particles have a charge of +2 and consist of two protons and two neutrons. It also summarizes George Gamow's 1928 quantum tunneling theory of alpha decay, which explained how alpha particles can escape the nucleus despite facing a Coulomb barrier. The theory predicts the relationship between half-life and emission energy that had previously been observed empirically.
Dokumen tersebut membahas tentang teori kesetimbangan, dinamika rotasi, dan titik berat kesetimbangan. Terdapat berbagai jenis kesetimbangan berdasarkan posisi dan keadaan benda, serta penjelasan mengenai momen gaya, momen inersia, dan hubungan antara gerak translasi dan rotasi.
This document provides an introduction to thermochemistry and the key concepts of enthalpy, enthalpy change, and standard enthalpy of formation. It defines system and surroundings, and the three types of systems - open, closed, and isolated. The key points are:
- Enthalpy change (ΔH) is the difference in enthalpies between products and reactants and indicates whether a reaction is endothermic or exothermic.
- Standard enthalpy of formation (H°f) is the enthalpy change when 1 mole of a substance is formed from its elements under standard conditions.
- Enthalpy of combustion (H°c) is the enthalpy change when 1 mole
Dokumen tersebut membahas tentang keseimbangan benda tegar dan partikel. Definisi benda tegar adalah benda yang tidak berubah bentuknya bila diberi gaya luar. Syarat keseimbangan benda tegar adalah jumlah gaya yang bekerja pada benda sama dengan nol dan jumlah torsi terhadap sembarang titik pada benda tegar juga sama dengan nol. Dokumen ini juga menjelaskan konsep partikel, titik berat, dan cara men
This document provides an alphabetical index of components for the Bobcat MT52 and MT55 service manuals. It lists various systems, components, and specifications that are referenced throughout the service manuals. Safety instructions are provided at the beginning, followed by sections covering systems like hydraulic, hydrostatic, drive, electrical, engine service, and specifications. Maintenance procedures in the operation manual can be done by the owner, while those in the service manual require a qualified Bobcat technician.
Dokumen tersebut membahas tentang termodinamika, meliputi konsep-konsep seperti usaha sistem terhadap lingkungan, hukum pertama dan kedua termodinamika, proses-proses termodinamika seperti isobarik, isotermik, dan adiabatik, serta siklus Carnot dan efisiensi mesin kalor.
Bab ini membahas konsep-konsep dasar teori relativitas khusus, meliputi:
1. Transformasi Lorentz dan postulat relativitas khusus
2. Pemekaran waktu dan kontraksi panjang
3. Massa, momentum, dan energi relativistik termasuk kesetaraan massa-energi.
This document provides examples and problems related to transport properties of gases. Specifically:
1. It gives examples calculating the diffusion coefficient of CO2 and viscosity of methane using transport property formulas.
2. It provides additional problems calculating properties like thermal conductivity, viscosity, diffusion rate, and heat transfer rate using the transport equations and given parameter values.
3. It concludes with multiple choice questions testing understanding of concepts like mean free path, factors affecting diffusion coefficient, relationships between temperature and transport properties, and kinetics and transport processes.
The document summarizes key concepts from Chapter 2 of a Physics textbook on kinematics of linear motion. It discusses the following in 3 sentences:
Linear motion can be one-dimensional or two-dimensional projectile motion. Equations of motion include relationships between displacement, velocity, acceleration, and time. Uniformly accelerated motion follows equations that relate the initial and final velocity, acceleration, and time to determine displacement and distance traveled.
This document discusses the phenomenon of diffraction - how light bends or spreads when encountering an obstacle or opening. It provides details on diffraction patterns created by single slits, edges, and gratings. Key points covered include the characteristics of diffraction patterns such as bright and dark bands, as well as the differences between Fresnel and Fraunhofer diffraction based on the distances between the light source, obstacle, and viewing screen. Equations for determining the positions of maxima and minima in diffraction patterns are also presented.
This document discusses damped and forced harmonic motion. It explains that in damped harmonic motion, a damping force acts opposite to the velocity to dissipate energy and stop vibrations. The damping causes the amplitude to decay exponentially over time. A system can be under-damped, over-damped, or critically damped depending on how quickly it stops oscillating. Forced harmonic motion occurs when an external periodic force drives the system, like pushing a swing. At resonance, the driving frequency matches the natural frequency, causing large amplitude oscillations. While resonance can be dangerous if it causes collapse, it can also be useful in applications like radios and musical instruments.
1) Simple harmonic motion (SHM) is a type of periodic motion where an object moves back and forth over the same path, like a mass on a spring or a pendulum.
2) For motion to be SHM, there must be a restoring force acting towards the equilibrium position that is proportional to the displacement.
3) The acceleration during SHM is directly proportional to the displacement from the equilibrium position and always acts to restore the object towards equilibrium.
The document discusses angular momentum in three sections:
1) It defines angular momentum and how it is analogous to linear momentum, relating angular momentum to torque and moment of inertia.
2) It explains that angular momentum is conserved when there is no external torque, and provides examples of how objects can change their moment of inertia and angular velocity while conserving angular momentum.
3) It states that angular momentum is a vector quantity pointing in the direction of the angular velocity, and provides examples of balancing angular momentum.
The rate law for the reaction 2A → A2 is second order, with the rate equal to k[A]2. For a second-order reaction, the integrated rate law is ln([A]/[A]0) = -kt. The half-life is independent of the initial concentration and is equal to 0.693/k.
- The Stern-Gerlach experiment in 1922 showed that a beam of silver atoms passed through an inhomogeneous magnetic field split into two beams, providing early evidence that angular momentum is quantized.
- The development of quantum mechanics helped explain phenomena like the fine structure of hydrogen emission spectra, but failed to account for observed splittings until the concept of intrinsic "spin" angular momentum was introduced.
- Angular momentum operators like Jx, Jy, and Jz are defined based on classical angular momentum expressions, with momentum terms replaced by operators involving partial derivatives. These operators obey specific commutation relationships and do not commute with one another.
Pada hari Selasa, 13 Oktober 2015, siswa melakukan praktikum difraksi cahaya untuk menunjukkan pelenturan cahaya melalui celah sempit dan mengukur panjang gelombangnya. Mereka menggunakan kisi difraksi dengan berbagai jumlah kisi dan mengukur jarak antara pita cahaya. Hasilnya menunjukkan panjang gelombang rata-rata sebesar 6,697×10−5 cm.
The document discusses chemical kinetics, which is the study of the speed of chemical reactions and the factors that affect reaction rates. It provides information on determining reaction rates from experimental data by measuring changes in reactant and product concentrations over time. The rate of a reaction is directly proportional to the concentrations of reactants raised to a power, where the powers are determined experimentally. Several examples are provided to illustrate how to calculate average and instantaneous reaction rates from concentration-time data and use this to determine the order of a reaction.
The document describes how the Zeeman effect can be observed using a strong electromagnet called an MM. A source of light is placed between the pole pieces of the MM, which have holes drilled through them. The light is passed through the holes and its spectrum is observed using a spectrograph. When a magnetic field is applied, the spectral lines split into multiple components that are polarized in different ways, demonstrating the Zeeman effect. This effect can be seen longitudinally or transversely to the magnetic field direction.
1. Dokumen tersebut membahas tentang hukum Faraday dan hukum Lenz yang menjelaskan tentang induksi elektromagnetik.
2. Juga membahas dinamo, transformator, detektor logam, dan beberapa soal yang terkait dengan konsep-konsep tersebut.
3. Termasuk rumus-rumus penting seperti induktansi, fluks magnetik, dan hubungan antara jumlah lilitan transformator dengan rasio tegangan.
Physics team at kibasila sec school made an animation on the Hooke's law of Elasticity. These teachers have never used a computer before for teaching purposes. This lesson is a result of a two days workshop and collaboration in design teams
This document provides objectives and guidance for revising physics concepts related to measurement and analysis, including choosing measuring instruments, identifying variables, making measurements, processing data, using equations and graphs, identifying sources of error, and drawing valid conclusions from experimental evidence and results. Key concepts covered include significant figures, sensitivity, precision, accuracy, systematic and random error, and analyzing linear relationships through equations, direct and inverse proportion, and calculating gradients and intercepts from graphs.
Dokumen tersebut membahas tentang keseimbangan benda tegar dan partikel. Definisi benda tegar adalah benda yang tidak berubah bentuknya bila diberi gaya luar. Syarat keseimbangan benda tegar adalah jumlah gaya yang bekerja pada benda sama dengan nol dan jumlah torsi terhadap sembarang titik pada benda tegar juga sama dengan nol. Dokumen ini juga menjelaskan konsep partikel, titik berat, dan cara men
This document provides an alphabetical index of components for the Bobcat MT52 and MT55 service manuals. It lists various systems, components, and specifications that are referenced throughout the service manuals. Safety instructions are provided at the beginning, followed by sections covering systems like hydraulic, hydrostatic, drive, electrical, engine service, and specifications. Maintenance procedures in the operation manual can be done by the owner, while those in the service manual require a qualified Bobcat technician.
Dokumen tersebut membahas tentang termodinamika, meliputi konsep-konsep seperti usaha sistem terhadap lingkungan, hukum pertama dan kedua termodinamika, proses-proses termodinamika seperti isobarik, isotermik, dan adiabatik, serta siklus Carnot dan efisiensi mesin kalor.
Bab ini membahas konsep-konsep dasar teori relativitas khusus, meliputi:
1. Transformasi Lorentz dan postulat relativitas khusus
2. Pemekaran waktu dan kontraksi panjang
3. Massa, momentum, dan energi relativistik termasuk kesetaraan massa-energi.
This document provides examples and problems related to transport properties of gases. Specifically:
1. It gives examples calculating the diffusion coefficient of CO2 and viscosity of methane using transport property formulas.
2. It provides additional problems calculating properties like thermal conductivity, viscosity, diffusion rate, and heat transfer rate using the transport equations and given parameter values.
3. It concludes with multiple choice questions testing understanding of concepts like mean free path, factors affecting diffusion coefficient, relationships between temperature and transport properties, and kinetics and transport processes.
The document summarizes key concepts from Chapter 2 of a Physics textbook on kinematics of linear motion. It discusses the following in 3 sentences:
Linear motion can be one-dimensional or two-dimensional projectile motion. Equations of motion include relationships between displacement, velocity, acceleration, and time. Uniformly accelerated motion follows equations that relate the initial and final velocity, acceleration, and time to determine displacement and distance traveled.
This document discusses the phenomenon of diffraction - how light bends or spreads when encountering an obstacle or opening. It provides details on diffraction patterns created by single slits, edges, and gratings. Key points covered include the characteristics of diffraction patterns such as bright and dark bands, as well as the differences between Fresnel and Fraunhofer diffraction based on the distances between the light source, obstacle, and viewing screen. Equations for determining the positions of maxima and minima in diffraction patterns are also presented.
This document discusses damped and forced harmonic motion. It explains that in damped harmonic motion, a damping force acts opposite to the velocity to dissipate energy and stop vibrations. The damping causes the amplitude to decay exponentially over time. A system can be under-damped, over-damped, or critically damped depending on how quickly it stops oscillating. Forced harmonic motion occurs when an external periodic force drives the system, like pushing a swing. At resonance, the driving frequency matches the natural frequency, causing large amplitude oscillations. While resonance can be dangerous if it causes collapse, it can also be useful in applications like radios and musical instruments.
1) Simple harmonic motion (SHM) is a type of periodic motion where an object moves back and forth over the same path, like a mass on a spring or a pendulum.
2) For motion to be SHM, there must be a restoring force acting towards the equilibrium position that is proportional to the displacement.
3) The acceleration during SHM is directly proportional to the displacement from the equilibrium position and always acts to restore the object towards equilibrium.
The document discusses angular momentum in three sections:
1) It defines angular momentum and how it is analogous to linear momentum, relating angular momentum to torque and moment of inertia.
2) It explains that angular momentum is conserved when there is no external torque, and provides examples of how objects can change their moment of inertia and angular velocity while conserving angular momentum.
3) It states that angular momentum is a vector quantity pointing in the direction of the angular velocity, and provides examples of balancing angular momentum.
The rate law for the reaction 2A → A2 is second order, with the rate equal to k[A]2. For a second-order reaction, the integrated rate law is ln([A]/[A]0) = -kt. The half-life is independent of the initial concentration and is equal to 0.693/k.
- The Stern-Gerlach experiment in 1922 showed that a beam of silver atoms passed through an inhomogeneous magnetic field split into two beams, providing early evidence that angular momentum is quantized.
- The development of quantum mechanics helped explain phenomena like the fine structure of hydrogen emission spectra, but failed to account for observed splittings until the concept of intrinsic "spin" angular momentum was introduced.
- Angular momentum operators like Jx, Jy, and Jz are defined based on classical angular momentum expressions, with momentum terms replaced by operators involving partial derivatives. These operators obey specific commutation relationships and do not commute with one another.
Pada hari Selasa, 13 Oktober 2015, siswa melakukan praktikum difraksi cahaya untuk menunjukkan pelenturan cahaya melalui celah sempit dan mengukur panjang gelombangnya. Mereka menggunakan kisi difraksi dengan berbagai jumlah kisi dan mengukur jarak antara pita cahaya. Hasilnya menunjukkan panjang gelombang rata-rata sebesar 6,697×10−5 cm.
The document discusses chemical kinetics, which is the study of the speed of chemical reactions and the factors that affect reaction rates. It provides information on determining reaction rates from experimental data by measuring changes in reactant and product concentrations over time. The rate of a reaction is directly proportional to the concentrations of reactants raised to a power, where the powers are determined experimentally. Several examples are provided to illustrate how to calculate average and instantaneous reaction rates from concentration-time data and use this to determine the order of a reaction.
The document describes how the Zeeman effect can be observed using a strong electromagnet called an MM. A source of light is placed between the pole pieces of the MM, which have holes drilled through them. The light is passed through the holes and its spectrum is observed using a spectrograph. When a magnetic field is applied, the spectral lines split into multiple components that are polarized in different ways, demonstrating the Zeeman effect. This effect can be seen longitudinally or transversely to the magnetic field direction.
1. Dokumen tersebut membahas tentang hukum Faraday dan hukum Lenz yang menjelaskan tentang induksi elektromagnetik.
2. Juga membahas dinamo, transformator, detektor logam, dan beberapa soal yang terkait dengan konsep-konsep tersebut.
3. Termasuk rumus-rumus penting seperti induktansi, fluks magnetik, dan hubungan antara jumlah lilitan transformator dengan rasio tegangan.
Physics team at kibasila sec school made an animation on the Hooke's law of Elasticity. These teachers have never used a computer before for teaching purposes. This lesson is a result of a two days workshop and collaboration in design teams
This document provides objectives and guidance for revising physics concepts related to measurement and analysis, including choosing measuring instruments, identifying variables, making measurements, processing data, using equations and graphs, identifying sources of error, and drawing valid conclusions from experimental evidence and results. Key concepts covered include significant figures, sensitivity, precision, accuracy, systematic and random error, and analyzing linear relationships through equations, direct and inverse proportion, and calculating gradients and intercepts from graphs.
Electromagnetism, alternating current and electromagnetic inductionRACSOelimu
The document is a compilation of past paper questions from CIE A2 Physics exams on electromagnetism, alternating current, and electromagnetic induction. It was compiled by the RACSO GROUP and contains questions from multiple past papers organized by topic for student review.
This document discusses centripetal acceleration and centripetal force. It defines centripetal acceleration as acceleration toward the center of a circular path caused by changing velocity. An equation is given for centripetal acceleration using angular velocity and radius. It also defines centripetal force as the force causing an object to travel in a circular path, and gives an equation for centripetal force using mass, velocity, and radius. Examples are provided to demonstrate calculating speed, acceleration, and force for objects moving in circular motion.
The document discusses a student's media production project for a children's TV drama opening titled "Skool Dayz".
The student used bright colors in the title to engage younger audiences. They also challenged conventions by focusing more on friend groups than individuals.
Feedback from the target audience of 7-12 year olds found the opening mostly enjoyable but sometimes difficult to understand. The ancillary tasks like a magazine and DVD cover received more positive feedback.
The student learned they need to be better organized and make more use of software tutorials for skills like video editing. New media technologies helped with research, planning, and final production.
This document provides information about the Edexcel GCE in Physics specification, including:
- An overview of the assessment requirements and objectives.
- Details of the 6 units that make up the qualification, including content outlines and assessment methods.
- Information on administration, resources, and support for the qualification.
- Appendices with additional details such as performance descriptions, key skills mapping, data and formulae.
The specification offers both concept and context-led approaches to teaching the units, which cover topics in mechanics, materials, waves, electricity, light, and experimental physics. Students take 3 compulsory AS units and then either 3 or 4 optional A2 units, with a mixture of external exams and internal assessment
Physics a2 unit4_06_centripetal_force fb1 patrick (21-02-14) editedsashrilisdi
1. The document defines key terms related to circular motion such as speed, velocity, acceleration, and resultant force.
2. It derives equations for acceleration (a = v2/r and a = rω2) and resultant force (ΣF = mv2/r or ΣF = mω2r) for an object moving in circular motion with constant speed.
3. Examples are provided to demonstrate how to use the equations to calculate speed, acceleration, and force for real-world circular motion scenarios.
This document defines key terms related to angular displacement, velocity, and motion. It explains that angles can be measured in degrees or radians, with 360° equal to 2π radians. Angular displacement is the angle an object rotates through, measured in radians. Angular velocity is the rate of change of the angular displacement with respect to time. Angular velocity and period are related to frequency, as angular velocity equals 2π divided by the period. Linear speed can also be calculated from angular velocity and radius of rotation. Examples are provided to illustrate these relationships and calculations.
2014 exam tt and revision workshops v2PaulCGerrard
This document provides the exam timetable for Durham School for the summer term of 2014. It lists the exam dates from April to June, the exam boards, subjects, levels, and room assignments. Key information includes:
- Exams take place on Tuesdays, Wednesdays, and Thursdays between April 22nd and June 5th.
- Subjects include GCSEs and AS/A2 levels in areas such as English, maths, sciences, humanities, languages, and more.
- Room assignments and supervising teachers are specified for each exam.
- Normal lessons are scheduled except when exams are taking place or during designated study/revision periods.
The document describes an experiment to determine the effect of string length on the period of a pendulum. Data was collected using a motion detector as the pendulum swung with string lengths of 20 cm and 10 cm. The period was calculated from the time taken to complete 20 oscillations. The results showed that longer string lengths had longer periods. Gravity was also calculated and had a small percentage error compared to the theoretical value.
My notes for A2 Chemistry Unit 4, typed by me and compiled from various sources. I cannot trace back where everything came from but again shall any intellectual property rights be violated, please comment /contact me and I will try my best to rectify them as soon as possible.
The document describes direct sensing using light dependent resistors (LDRs), which are sensors whose resistance decreases when exposed to light. An LDR contains a thin film of cadmium sulfide that allows more current to flow when photons hit it and remove electrons. The document explains how LDRs can be used in a potential divider circuit to produce an output voltage that varies with light intensity measured by the LDR.
My notes for A2 Chemistry Unit 5, typed by me and compiled from various sources.
I cannot trace back where everything came from but again shall any intellectual property rights be violated, please comment /contact me and I will try my best to rectify them as soon as possible.
The document provides information about IGCSE (International General Certificate of Secondary Education) classes offered at The Shri Ram School. It discusses the benefits of IGCSE including a flexible curriculum, assessment through various tests, and preparation for a variety of qualifications after Grade 10. Students at the school take 9 subjects in total from categories including languages, humanities, sciences, and other options. The document also outlines the infrastructure and facilities available at the school including a learning resource center, math lab, art gallery, and sports facilities. It shares details about admissions and notes that the school faculty regularly attends Cambridge-hosted training workshops in India and abroad.
This document provides an overview of simple harmonic motion and waves. It begins by defining simple harmonic motion and providing examples of objects exhibiting SHM, such as a mass attached to a spring, a ball in a bowl, and a pendulum. It then discusses damped oscillations and how friction reduces amplitude over time. Next, it introduces the topic of wave motion, distinguishing between mechanical and electromagnetic waves. It defines key wave properties and concepts. The document concludes by describing experiments that can be performed to demonstrate water and rope waves.
This document provides an overview of the AQA A2 Biology Unit 4 specification. It covers key topics in ecology including fieldwork techniques, populations and the ecological niche, ecological succession, nutrient cycles, energy flow, intensive farming, the greenhouse effect, human populations, metabolism, genetics, and natural selection. Fieldwork techniques discussed include random and systematic sampling using quadrats and transects to collect quantitative data on abiotic and biotic factors.
Pendulum Lap investigating the relationship between the length of the pendlum string and the time needed for the oscillations
Score archieved: 5/6 in the DCP section.
Edexcel as chemistry tag 2nd ed (Book answers and teachers guide)Samith Senadeera
This document is a teacher guide for the Edexcel AS Chemistry textbook. It provides answers to questions at the end of each chapter in the textbook to help students understand the concepts. For each answer, additional examiner notes are included to explain the reasoning and common mistakes to avoid. The guide also contains model answers for practice unit tests with marking points indicated. It is designed to help both teachers and students with the Edexcel AS Chemistry curriculum.
This document provides a summary of key concepts in Edexcel IAL Physics Unit 1, including:
1. SI units and derived units used in physics.
2. Concepts of motion including speed, velocity, acceleration, and representations using graphs.
3. Newton's laws of motion - objects remain at rest or in uniform motion unless acted upon by a force, acceleration is proportional to force, and for every action there is an equal and opposite reaction.
4. Forces and their interactions, including gravity, weight, friction, projectile motion, and applications of concepts like vectors, free body diagrams, and statics.
1) The document discusses oscillatory and periodic motion, with a focus on simple harmonic motion (SHM).
2) SHM is defined as a periodic motion where the restoring force is directly proportional to displacement from the equilibrium position.
3) The key characteristics of SHM are described, including that it can be represented by harmonic functions like sine and cosine, and that the total energy of the system remains constant.
The document discusses rotational motion and kinematics. It defines key concepts like the radian, angular velocity, and angular acceleration. It describes how to relate linear and rotational motion through equations. It also introduces the concept of moment of inertia, which describes an object's resistance to changes in rotational motion based on its mass distribution. Different formulas are given for calculating the moment of inertia of objects like rods, disks, and point masses rotating around different axes.
Engineering Mechanics covers various topics in mechanics including:
1. Relativistic mechanics deals with mechanics compatible with special and general relativity.
2. Quantum mechanics provides a mathematical description of energy, matter, and their interactions at nanoscopic scales.
3. Mechanics of deformable bodies deals with how forces are distributed in solid bodies and the resulting stresses and deformations.
This document provides information about various concepts related to linear motion, including:
- Acceleration, deceleration, constant velocity, and how these concepts are represented on distance-time and velocity-time graphs.
- Key features of motion graphs like gradient, area under the graph, and how to analyze non-uniform velocity and acceleration.
- Other linear motion topics like inertia, momentum, impulse, force, balanced forces, gravity, pulleys, and work, energy, power and efficiency.
- Diagrams and examples are provided to illustrate concepts like collisions, explosions, resolution of forces, three forces in equilibrium, and elasticity.
1) A spring is an elastic object that stores mechanical energy and exerts a restoring force proportional to its displacement from equilibrium.
2) The motion of an object attached to a spring is called simple harmonic motion (SHM), where the restoring force causes the object to oscillate back and forth periodically over time.
3) In an undamped spring system without friction or energy losses, the object will oscillate indefinitely; a damped system includes forces proportional to velocity that cause the oscillations to decay over time until the object reaches equilibrium.
The document discusses oscillatory and vibratory motion, describing it as motion where an object moves back and forth about a mean position in a periodic fashion. It defines simple harmonic motion as oscillatory motion produced by a restoring force proportional to displacement. Key concepts discussed include restoring force, amplitude, frequency, period, displacement, velocity, acceleration, phase, energy conservation, and free vs forced oscillations. It also covers waves, types of waves, progressive waves, superposition, interference, beats, and stationary waves.
This document provides definitions and explanations of basic biomechanical concepts including:
- Mass is the quantity of matter an object contains and is measured in kilograms. Weight is the force exerted on a surface due to gravity and is measured in kilograms-force.
- A force can produce movement or deformation and is measured in Newtons. Newton's laws of motion describe how objects interact under various forces.
- The centre of gravity is the point where total mass of an object is considered to be concentrated. An object's stability depends on the position of its centre of gravity relative to its base of support.
- Forces can be analyzed using graphical methods like the parallelogram and triangle methods
Important Helpful Physics Notes/Formula--Must Seeanicholls1234
The document discusses key physics concepts related to motion including:
- Speed is distance traveled over time. Velocity includes direction of motion.
- The slope of a distance-time graph represents speed. The area under a velocity-time graph represents distance traveled.
- Forces can cause objects at rest to accelerate or objects in motion to speed up, slow down, or change direction depending on whether the net force is zero or non-zero. Acceleration depends on the net force applied and the object's mass.
1. Hooke's law describes the elastic properties of springs and relates the spring force (Fs) to the displacement (x) of an object from its equilibrium position by Fs = -kx, where k is the spring constant.
2. When an object attached to a spring is displaced from its equilibrium position, the restoring force (Fs) pushes the object back toward equilibrium in simple harmonic motion.
3. The motion of a spring-mass system provides an example of simple harmonic motion, where the displacement (x) varies with time (t) as x = Acos(ωt), with A as the amplitude and ω as the angular frequency.
The document provides an overview of motion in one dimension, including key concepts such as scalars and vectors, distance and displacement, speed and velocity, and acceleration. It defines these terms and distinguishes between them. Examples of motion graphs including displacement-time graphs, velocity-time graphs, and acceleration-time graphs are presented and the slopes and areas of these graphs are related to velocity, acceleration, and displacement. Equations of motion are described for objects experiencing constant acceleration due to gravity or thrown vertically.
This Unit is rely on introduction to Simple Harmonic Motion. the contents was prepared using the Curriculum of NTA level 4 at Mineral Resources Institute- Dodoma.
analyzing system of motion of a particlesvikasaucea
This document discusses analyzing the motion of particle systems using Newton's laws of motion. It begins by defining a particle and describing the position, velocity, and acceleration vectors of a particle. It then discusses how to use Newton's laws to calculate the forces needed to cause a particle to move in a particular way and how to derive equations of motion for particle systems. Examples are provided on simple harmonic motion and calculating the forces required to tip over a bicycle. The document concludes by outlining the general procedure for deriving and solving equations of motion for systems of particles.
115L Lab OneUsing Physical Principles and Measurements to .docxhyacinthshackley2629
115L Lab One
Using Physical Principles and Measurements to Make a Prediction:
Target Practice with the Ballistic Pendulum
1 Introduction
Physics is an important science largely because it allows us to make accurate
predictions of objects’ behaviors in different situations. This idea has been
applied in the engineering of buildings, vehicles, and energy production. It is
used to design aircraft, plan space missions and execute battle plans in warfare.
In the first part of this lab you will make use of two of the most valuable
principles of physics, along with a couple basic measurements, to determine the
speed of the ball launched by the spring gun in your ballistic pendulum. In the
second part, you will calculate the point where the ball will strike when it is
fired without the catching pendulum in place. You will fire the gun to test the
accuracy of your predictions. Finally, you will do some simple analysis of the
cause of any inaccuracy in your calculated targeting.
Tips for success:
• Make all your measurements as carefully as possible.
The more accurate your measurements are, the closer you will
come to hitting your target.
• Pay attention to units.
Calculations require that all units match for the numbers to come
out right. For example, a distance may be recorded in meters,
centimeters, inches, miles, etc. The distance is fixed, but the
value of the number used to record it can vary greatly.
2 Using Conservation of Momentum and Con-
servation of Energy to measure the initial ve-
locity of the ball
Test fire your ballistic pendulum 3 or 4 times, observing the parts and
how the mechanism works.
Be very careful not to get in the path of the ball!
Directly measuring the ball’s velocity as it is fired by the ballistic pendulum
would be very difficult. However, since there are some physical properties that
are conserved, meaning that the total amount cannot change–only the form can
change or there can be a transfer from one object to another, the ball’s speed
can be determined quite accurately with only a couple simple measurements
1
and a couple short calculations.
How could you go about measuring the ball’s speed as it launches from
the ballistic pendulum?
Why would it be hard to use that method with this equipment?
2.1 Tracking the Energy
The act of firing the ball from the ballistic pendulum, and the different forms
that the energy involved takes during the process, can be viewed in four distinct
steps:
• Loading
• Firing
• Collision between the ball and pendulum
• Swing of the pendulum
Loading. To load the ballistic pendulum, you have to push the ball back
against a very stiff spring. In the process of doing this you use some of the
energy stored in your body. Once the pendulum is loaded, the energy that you
gave up is now stored in the compressed spring.It would be difficult to make
a measurement of the energy leaving your body during the compression of the
spring, but it is quite easy to put a number on the ener.
1) Inertia is the tendency of an object to resist changes in its motion. Mass is a measure of an object's inertia, with more massive objects being harder to accelerate or decelerate.
2) Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This relationship can be expressed as F=ma.
3) Newton's third law states that for every action force there is an equal and opposite reaction force. Forces always occur in action-reaction pairs between interacting objects.
1) Momentum of an object is defined as its mass multiplied by its velocity. According to Newton's second law, the rate of change of momentum is equal to the net force acting on an object.
2) The total momentum of an isolated system of objects is conserved. During collisions, colliding objects can be treated as an isolated system if external forces are small enough to be ignored.
3) In elastic collisions, both momentum and kinetic energy are conserved. In inelastic collisions, some kinetic energy is lost, such as being converted to heat. Completely inelastic collisions result in the objects sticking together afterwards.
The document provides a summary of key concepts and formulas for Mechanics 1 that will not be included in the formula book. It covers topics like kinematics in one and two dimensions, forces, Newton's laws of motion, connected particles, and projectile motion. For each topic, it lists the most important formulas and concepts to know without explanations or worked examples. The document is intended as a study aid to familiarize students with course requirements rather than a replacement for textbooks.
This document discusses analyzing the motion of particle systems using Newton's laws of motion. It defines a particle as a point mass with no orientation or rotational inertia, and discusses describing particle position, velocity, and acceleration using Cartesian components of position, velocity, and acceleration vectors. It presents Newton's three laws of motion and provides everyday examples. It also discusses calculating forces required to cause prescribed particle motions using free body diagrams and Newton's second law, and deriving and solving equations of motion for particle systems.
Similar to Simple Harmonic Motion - A2 Physics (20)
2. Tibor Astrab
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Contents
Aim and Summary........................................................................................ 3
Background Physics...................................................................................... 4-7
Simple Harmonic Motion(SHM).................................................... 4
Potential Energy(PE) to Kinetic Energy(KE).................................. 4-5
Simple Harmonic Motions Equations............................................ 5-7
Graphs of Displacement, Velocityand Acceleration..................... 7
Preliminary Apparatus, Method and Risk Assessment............................... 8-10
PreliminaryApparatus.................................................................. 8
PreliminaryMethod...................................................................... 8-9
PreliminaryRiskAssessment........................................................ 9-10
SafetyPrecautions........................................................................ 10
Preliminary Dealing with Uncertainty......................................................... 10-12
Random andSystematic Error...................................................... 10-11
Percentage Uncertainty................................................................ 11-12
Preliminary Results and Graphs................................................................... 12-15
Measuring the SpringStiff Constant............................................ 12-13
Measuring the Effect of Mass onTime Period............................. 14-15
Preliminary Conclusion and Evaluation....................................................... 15-16
Evaluating the Results of Measurement ofthe Spring StiffConstant... 15
Evaluating the Results of Effect of Mass on Time Period.......... 15-16
Main Apparatus, Method and Risk Assessment...................................................... 17-18
Main Apparatus................................................................................... 17
Main Method....................................................................................... 17-18
Main Risk Assessment........................................................................ 18
Main Dealing with Uncertainty.......................................................................... 18
Main Results and Graphs.................................................................................... 19-20
Measuring the Spring Stiff Constant...................................………….. 19
Measuring the Effect of Mass on Time Period................................ 20
Main Conclusion and Evaluation............................................................................. 21-23
Appendices................................................................................................................ 24
3. Tibor Astrab
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Aim and Summary
My main aim is to investigate how the Simple Harmonic Motion changes when a different
mass is applied.
The experiment will consist of a mass being attached to a spring in a vertical position. The
masses themselves are made with a hook so that I can change the amount of force I am
adding onto the spring. I will also use mathematical equations to solve different types of
relationships which I will discuss in the Background Physics section.
*A simple diagram to visualise the whole experiment:
4. Tibor Astrab
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Background Physics
Simple Harmonic Motion - SHM
A Simple Harmonic Motion is an oscillation in which the acceleration is directly proportional
to the displacement from the mid-point, and is directed towards the mid-point. This
basically means that the further away an oscillating object is from its mid-point, the more
acceleration the object undergoes in order to bring it back to the mid-point, also called the
restoring force. An object moving with SHM must oscillate to and fro, either side of a mid-
point. Examples of SHM include a mass oscillating on a spring (this experiment), a mass
attached to a pendulum or a mass attached in-between two strings. All of these examples
show similar results on how the movement of the mass behaves.
In order for the oscillation to actually work, there must be a force that acts upon the mass
and drives it back and forth, left to right or up and down; we call this the Restoring Force.
The restoring force is always directed towards the mid-point and gets larger as the
displacement increases and smaller if the displacement decreases. This means that as the
object passes through the mid-point, it goes to the maximum positive displacement (right
side or upwards) and then to the maximum negative displacement. This does not mean that
distance is negative, but instead the midpoint acts as the separation of the two opposite
sides.
Potential Energy (PE) to Kinetic Energy (KE)
A very important key point to remember is that the restoring force makes the object
exchange Potential and Kinetic Energy. This is because as the object moves through the mid-
point, the restoring force does work on the object and so transfers some PE to KE. As the
object passes through the mid-point and starts moving away, the KE is transferred back to
PE. From this I can assume that at the mid-point, the object’s KE is at its maximum and its PE
is at zero. I can also say that when the object is fully displaced, the PE is at its maximum and
the KE is zero.
*A table showing the relationship between KE & PE with Displacement
Kinetic Energy Potential Energy
Maximum +ve Displacement Zero Maximum
Midpoint Maximum Zero
Maximum –ve Displacement Zero Maximum
An easier way of viewing this would be on a graph that simultaneously shows the exchange
between the KE and PE.
5. Tibor Astrab
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The sum of the potential and kinetic energy is the total energy. The real name for this is the
Mechanical Energy and stays constant throughout the oscillation as long as it is not damped.
Now that it is clear to see the exchange between the two energies, I will also show the
whole process for one complete oscillation.
The Energy Transfer for one Complete Cycle of Oscillation:
𝑷𝑬 → 𝑲𝑬 → 𝑷𝑬 → 𝑲𝑬 → 𝑷𝑬
Simple Harmonic Motions Equations
In this experiment, I will be using a number of different equations to help me investigate
different relations between dependant and independent variables.
The definition states that acceleration is directly proportional to the displacement, but in
the opposite direction, this gives:
𝒅 𝟐
𝒙
𝒅𝒕 𝟐 ∝ −𝒙 For a complete oscillation, an object turns 2𝜋
radians in time 𝑇. And we know that; 𝒔 =
𝑫
𝑻
, this gives us 𝒔 =
𝟐𝝅
𝑻
. However, since Frequency
is the inverse of Period, the equation changes to: 𝒔 = 𝟐𝝅𝒇. Therefore;
𝒅 𝟐
𝒙
𝒅𝒕 𝟐
= −(𝟐𝝅𝒇) 𝟐
𝒙
So if I know the values of frequency and displacement, we can work out the acceleration at
a given point.
*A graph showing the simultaneous
exchange between KE and PE
6. Tibor Astrab
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In order for me to start the oscillation I must first displace the mass by a certain distance -
pulling it downwards. This will cause the spring to stretch – forming the elastic force.
The following equation is used to work out the amount of force exerted on the spring after
being stretched:
𝑭 = 𝒌𝒙
Where;
F is the Force measured in N
k is the Spring Constant (stiffness) measured in Nm-1
x is the Displacement measured in m
However, going back to the definition of SHM - acceleration being directly proportional to
the displacement, we can come out with another equation.
I know that: 𝑭 = 𝒎𝒂, so acceleration is proportional to Force. If that is the case, then the
Force on a Simple Harmonic Oscillator must also be proportional to its displacement. If I put
the equations together, we get: = 𝒎𝒂 = 𝒎
𝒅 𝟐
𝒙
𝒅𝒕 𝟐 . Using the equation: 𝑭 = −𝒌𝒙, (negative
because acceleration is in the opposite direction if displacement) we get our final equation:
𝒅 𝟐
𝒙
𝒅𝒕 𝟐
= −
𝒌
𝒎
𝒙
It is also important to know how much energy has been stored when compressing or
stretching a spring. This can be worked out by looking at the area under the Extension -
Force graph.
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By looking at the simple equation of the area of a triangle where: 𝑨 =
𝟏
𝟐
𝒂𝒃, I can apply this
to work out the energy stored. This gives me:
𝑬 =
𝟏
𝟐
𝒌𝒙 𝟐
And at last I come to my final equation for working out the period of an oscillation;
𝑻 = 𝟐𝝅√
𝒎
𝒌
This is one of the most important equations that I will be using because it can links period,
mass and the spring constant, which means that if I know two of the values; I can work out
the third just by rearranging the equation.
Graphs of Displacement, Velocity and Acceleration
Displacement – this graph can either be a cosine or a sine wave depending on when the
measurements have started. If they started when the object was at a maximum
displacement we use the cosine graph or if they started at a minimum displacement we can
use the sine graph.
Velocity – we know that velocity is just the differential of a Displacement – Time graph and
therefore it is just the gradient of the displacement graph. The oscillation is quarter of a cycle
in front of the displacement.
Acceleration – and we also know that acceleration is the differential of the Velocity – Time
and is another gradient, this time of a Velocity – Time graph. I can also see that the
Acceleration – Time graph is in anti-phase with the Displacement – Time graph.
8. Tibor Astrab
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Preliminary Apparatus, Method and Risk Assessment
The main goal of the preliminary stage is to get a rough idea of what the results
should show and therefore I will not be taking extreme accuracy into account.
Preliminary Apparatus
This apparatus will not be so different from the apparatus used in the real practical. A few
minor differences such as the minimum possible measurement of the ruler or the spring
quality may be the case.
Apparatus:
Spring – this is what the oscillating mass will be attached to
Two Retort Stands – one for attaching the spring and the other for holding the ruler
Ruler – to measure the displacement
Stopwatch – to measure the time
Mass – a piece of round metal with a hook
Preliminary Method
At first, I will attach the spring to the Retort Stand, spending little time figuring out the best
possible way of doing it. I will only make sure that the spring is attached securely and so it
does not fall off at any point. I will then attach the mass at the bottom of the spring and
attach a ruler on a different retour stand right next to the oscillating system. At first I must
work out the stiffness constant of the spring; this is relatively easy and only requires three
simple steps:
Work out the Force acting on the spring using 𝑭 = 𝒎𝒈, we know the mass and the
value of gravity (9.81 ms-2)
Measure the amount of displacement
Rearrange 𝑭 = 𝒌𝒙 to 𝒌 =
𝑭
𝒙
to find the stiffness constant
In this part of the experiment I will use five different masses weighing 100g, 200g, 300g,
400g and 500g. These masses will all give different displacements of the spring. Therefore,
by combining the different masses and different displacements I can take create a Force-
Extension graph from which I will find the spring stiffness constant.
I will start off by slightly pulling down on the mass and noting down the displacement. After
that, I will let go and start the timer on the stopwatch. I will note down the time taken for
one oscillation. The best way of doing this would be to measure the time taken over several
9. Tibor Astrab
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oscillations and then dividing the total time by the amount of completed oscillations to get
the average period.
I will repeat these steps for different masses – thus changing the length and the stiffness of
the spring. I will also use my background knowledge in small detail to confirm that my
outcomes are relatively accurate and that my experiment is being carried out correctly.
My results will be stored on a table where I can easily note down every outcome of the
experiment. The table will include all basic information such as; the mass on the spring, the
length of the spring etc...
Preliminary Risk Assessment
Even though this is the preliminary experiment, safety precautions must still be followed to
the required extent in order to avoid any injuries and damages to me, the people around me
and any of the school’s apparatus.
The experiment its self is not very dangerous and so the working environment can take
place within the school laboratory. The apparatus being used is also safe to an extent and as
long as it is being used in the appropriate way. The two most important things to look out
for are the springs and the masses.
Springs
The springs gain energy when they are pulled apart or constricted and have the tendency to
fly off at very high speeds in random and unpredictable direction IF they are not safely
attached to a stationary point – making it possible for an injury or a small damage to take
place. It is therefore necessary for me to make sure that this is not the case and I will take
extra care attaching the spring firmly to the retour stand.
Masses
Like any other objects, metal plate masses will also gain potential energy when they are
lifted further away from the ground and can also cause injuries and damages when dropped
or thrown. In this experiment, the loads will not exceed a great mass; they will be relatively
light and based on a small circular shape with a short radius. I will also ensure that the metal
hook is connected in the right way around the spring.
Safety Precautions
I will not be required to take extra care about the clothes that I will be wearing due to the
small risks involved; however it will be necessary for me to wear the goggles because of the
potential dangers that revolves around springs.
10. Tibor Astrab
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The space around me will have to be free and clear of any obstacles that may harm me or
others around me and also affect my results.
Preliminary Dealing with Uncertainty
In this preliminary section, I am expecting the uncertainty to be higher than the
uncertainty in the actual practical.
Every measurement that I take will always have some error in it, causing uncertainty. I can
minimise this error by taking certain actions, these may include; changing the measuring
equipment for a more accurate one, using a spring that has a better quality etc…
There are two types of errors;
Random Error
Systematic Error
Random Error
Random error is something that I cannot stop from happening. These errors may come from
all sorts of circumstances such as; tilting my head at a slightly different angle when noting
down the same measurement or even the effects of noise.
Systematic Error
Systematic errors occur due to the apparatus I am using. This means that the errors can be
changed and minimised if I just change the apparatus. For example; if my ruler measures to
the nearest centimetre, I can change that by replacing it with something that measures to
the nearest millimetre, thus reducing the uncertainty.
In my preliminary practical, the possible random errors are;
The direction of the wind – even though I am in an enclosed space (the laboratory)
there is still a chance of a relatively weak force of wind being created due to the
other pupils walking past my experimental area. It may seem very small, but it still
may affect the oscillation of my mass on spring.
Measuring the displacement – every time I take a reading from the ruler, there is a
very high chance that I may observe the value at a slightly different angle, thus giving
me a slightly different reading from the true value.
11. Tibor Astrab
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The unstoppable movement of the spring – after I attach a mass on the spring, it is
very difficult for me to stop it bopping up and down. It bops up and down by a very,
very small distance but still affects my results in some way.
In my preliminary practical, the possible systematic errors are;
The Ruler – the ruler measures to the nearest millimetre – making my range of
uncertainty to be ±0.5mm (±0.0005m). I will then use this value each time I get a
reading and divide it by that reading and find the product of that value and 100 to
get my final percentage uncertainty. To simply what I just stated, I will use this
equation:
% 𝑢𝑛𝑐𝑒𝑟𝑡𝑎𝑖𝑛𝑡𝑦 = (
± 0.0005
𝑎𝑐𝑡𝑢𝑎𝑙 𝑟𝑒𝑎𝑑𝑖𝑛𝑔
) × 100
Acceleration due to Gravity – it is known that the range of uncertainty of
acceleration due to gravity is ±0.1ms-2. Again, using the same method as before I get:
% 𝑢𝑛𝑐𝑒𝑟𝑡𝑎𝑖𝑛𝑡𝑦 = (
± 0.5
𝑔
) × 100
In this case however, I will only be using one value for the denominator: g = 9.81.
This allows me to make the calculation now: (
± 0.5
9.81
) × 100 = 1.02%~1%
The Stopwatch – in this case I am using a digital stopwatch that measures to 2
decimal places. This means that my 2nd decimal value could either be very close to
zero or very close to one, implicating that my 2nd decimal number was about to
change or just turned to that number. So I will choose my range to be ±0.01s.
% 𝑢𝑛𝑐𝑒𝑟𝑡𝑎𝑖𝑛𝑡𝑦 = (
± 0.01
𝑎𝑐𝑡𝑢𝑎𝑙 𝑟𝑒𝑎𝑑𝑖𝑛𝑔
) × 100
The reason why I want to find the percentage uncertainty in my results is so that I can work
out the actual percentage error when it comes to doing calculations using the equations
stated earlier.
12. Tibor Astrab
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For example:
When I want to measure the spring stiff constant, I use the equation 𝑘 =
𝐹
𝑥
. But first I
must work out the force by multiplying the mass by the acceleration due to gravity. If
my mass is 100g (0.1kg), I multiply the gravity (9.81) by this mass. However, the
percentage uncertainty due to gravity is ±1%, and so my answer will look like this –
𝐹 = 𝑚𝑔 = 0.1 × (9.81 ± 1%) = 𝟎. 𝟗𝟖𝟏 ± 𝟏%𝑵
I measured my extension to be 0.032m with the range of uncertainty of ±0.0005m.
This makes my percentage uncertainty (using the equation above) ±1.56% rounding
to 1 decimal place – ±1.6%.
So my final answer with the percentage uncertainty is:
𝑘 =
0.981 ± 1%
0.032 ± 1.6%
= 𝟑𝟎. 𝟔𝟓𝟔 ± 𝟐. 𝟔%𝑵𝒎−𝟏
Preliminary Results and Graphs
In this section I will display the results that I collected in the preliminary practical. The
results will be displayed in Tables and Graphs. The purpose of graphs is to easily visualise
any patterns that may appear between different variables as well as to calculate any data.
My graphs will also include range bars, showing the highest and lowest value obtained for
the same result. In the preliminary, I repeated my experiments 5 times.
Preliminary Results
Measuring the Spring Stiff Constant
When I started my practical, it turned out that the spring stiff constants of the springs were
not known. However, I assumed that all of the springs were the same; this is because they
looked completely identical – the size, the width, the weight and even the colours were
matching and they all came from the same plastic bag. My first task was to find out the
spring stiff constant.
Method
This method was already shown in my example when I calculated the percentage
uncertainty of the spring stiff constant so I will not go into much detail, instead I will only
show the main steps.
13. Tibor Astrab
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First I measured the Force using 𝑭 = 𝒎𝒈
Then I measured the extension of the spring in metres
This process was repeated for 5 different masses on the spring, ranging from 0.1kg
to 0.5kg
A Force-Extension Graph was plotted and analysed to find the spring stiffness
constant
Average Results
Mass (kg) Force (N)
[±0.0981]
Extension (m)
[±0.0005]
0.1 0.981 3.20×10-2
0.2 1.962 7.17×10-2
0.3 2.943 11.2×10-2
0.4 3.924 15.1×10-2
0.5 4.905 19.3×10-2
Force-ExtensionGraph
Since 𝒌 =
𝑭
𝒙
I can plot a Force-Extension graph and use the gradient of the line to find out
the spring stiff constant.
y = 24.468x + 0.2045
0
1
2
3
4
5
6
0 0.05 0.1 0.15 0.2 0.25
Force[±0.0981](N)
Extension [±0.0005] (m)
14. Tibor Astrab
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Measuring the effect of mass on time period
This time I am looking at how the time period changes when different weights are applied to
the spring.
Method
At first I’ve attached a mass on the spring, allowing the spring to stretch naturally
I then prepared the stopwatch to measure the time over 10 oscillations
Next step was to gently pull down on the spring and letting go, this would start off
the oscillation
After I noted the time taken for 10 oscillations, I would divide that time by 10 so that
I get an average value for the period for 1 oscillation only
Average Results
Mass (kg) 10 Periods (s) Period (s) (Period)2
(s)
0.1 3.968 0.397 0.158
0.2 5.682 0.568 0.323
0.3 6.866 0.687 0.471
0.4 7.814 0.781 0.611
0.5 8.726 0.873 0.761
After obtaining my results, I found the most appropriate graph that will allow me to
calculate the spring stiffness constant. Here is how I do it:
At first, I square both sides of the equation ‘𝑇 = 2𝜋√
𝑚
𝑘
‘ to get 𝑇2
= 4𝜋2 𝑚
𝑘
I can then plot a T2-Mass graph in which the gradient would equal to
4𝜋2
𝑘
Since the gradient =
4𝜋2
𝑘
, I can rearrange to get 𝑘 =
4𝜋2
𝑔𝑟𝑎𝑑𝑖𝑒𝑛𝑡
15. Tibor Astrab
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(Period)2
-Mass Graph
Preliminary Conclusion and Evaluation
Evaluating the Results of Measurementof the Spring Stiff Constant
The equation of the graph is 𝒚 = 𝟐𝟒. 𝟒𝟔𝟖𝒙 + 𝟎. 𝟐𝟎𝟒𝟓 and since the general equation for
linear graphs is 𝑦 = 𝑚𝑥 + 𝑐, the gradient for my Force-Extension line is 24.468.
Therefore the Spring Stiff Constant = 24.468Nm-1
The equation actually represents the thin black line that runs through the thicker blue line.
The blue plots are the actual results obtained whereas the black line is a ‘line of best fit’.
Since the line of best fit is very similar and practically runs through the same points as the
blue line, I can assume that the gradient is correct and accurate enough for me to do my
calculations.
Evaluating the Results of Effect of Mass on Time Period
The equation of the (Period)2-Mass Graph is 𝒚 = 𝟏. 𝟒𝟗𝟓𝟓𝒙 + 𝟎. 𝟎𝟏𝟔𝟏. From this I can see
that the gradient is equal to 1.4955. I will then use the rearranged equation mention earlier
to find out the spring stiffness constant.
𝒌 =
𝟒𝝅 𝟐
𝒈𝒓𝒂𝒅𝒊𝒆𝒏𝒕
𝒌 =
𝟒𝝅 𝟐
𝟏. 𝟒𝟗𝟓𝟓
= 𝟐𝟔. 𝟑𝟗𝟖𝑵𝒎−𝟏
In the first method, I calculated the gradient of a Force-Extension graph which was equal to
the spring stiffness constant. This method was relatively straightforward and required little
y = 1.4955x + 0.0161
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0 0.1 0.2 0.3 0.4 0.5 0.6
(Period)2(s)
Mass (kg)
16. Tibor Astrab
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time. However, the second method involved the use of the equation ‘𝑇 = 2𝜋√
𝑚
𝑘
‘ where I
had to do some algebra and rearranging to obtain the most suitable graph that will allow me
to work out the spring stiffness constant. The second time I obtained the spring stiffness
constant, it was slightly bigger than the previous one - This time it was 26.398Nm-1 but there
is no cause for concern since the difference is small. This could be due to the fact that I’ve
measured the same thing using two completely different methods - involving different
techniques and calculations.
The difference between the constants could also had come from the different results
obtained, for example; the smallest time taken for a full oscillation for a mass of 0.1kg was
0.395s and the longest time taken was 0.400s, with a difference of only 0.005s. This was
most likely caused by me not pressing the stop button on the stopwatch at the right time; it
is possible that I waited just slightly longer or shorter before stopping the timer. I also could
have had my head at a slightly different angle as I was timing the oscillation each time,
meaning that the time I measured was either accounted for slightly more or less than 10
oscillations.
This sort of error falls under a random error and is nothing I can do about so when it comes
to my main experiment, I will still use a very similar method to measure the time period.
This is the end of my preliminary experiment. In my main experiment, I will
state the improvements that I’ve made in order to increase my accuracy and
reliability of my results.
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Main Apparatus, Method and Risk Assessment
In my main experiment I would have made improvements to my measurements
and methods of obtaining different data. This means that I have considered the
different factors that were affecting my reliability and accuracy and tried to
change them.
MainApparatus
The main Apparatus will differ just slightly from the preliminary to improve reliability and
accuracy.
Apparatus:
Spring – this is what the oscillating mass will be attached to
Retort Stand – this is where the spring will be attached to
Ruler – to measure the displacement
Stopwatch – to measure the time
Mass – a piece of round metal with an attachment
Improvements/New Apparatus:
Straight, Thin Stick – this is used for when I am calculating the time period. It helps
when I place it behind the oscillating system, creating a horizontal line in the
background that makes it easier for me to see when the mass has passed the
midpoint.
Four Plain Plastic Squares – these four plastic squares are placed around the
oscillating system in order to isolate it from the surroundings and mainly any force of
wind that can affect my results.
Weighing Scale – In order to measure my masses, I used an accurate and electric
digital weighing scale. It is also important to mention that this time I will be using
ten different masses instead of just five, meaning that my new results will vary
from 0.1kg to 1kg.
Main Method
The main method is also not so different from the preliminary. Minor changes such as the
isolation of the experiment from the rest of the laboratory and using a brand new spring
were introduced.
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I will start off by placing two retort stands next to each other on a stable, straight desk. The
retort stand on the left will be holding a ruler in a vertical position where as the other retort
stand will be used as a grip to which the spring will be attached, also in a vertical position. I
will then attach my first mass (0.1kg) with a hook onto the spring and measure the
displacement. I will note down my results using this method up to a mass of 1kg (twice as
much than preliminary). This is so that I can get a rather more accurate value of the spring
stiff constant which seems to get more accurate and closer to the true value as I add more
mass and hence increase the extension of the spring. I will repeat this process six times –
adding an extra take than in the preliminary trial. In my second part I will calculate the time
period for every oscillating mass. I will do this by displacing the attached mass by a short
amount and the gently letting go while also starting the stopwatch after it has passes the
horizontally positioned stick in the background. This time I will also count up to 10
oscillations and so I will be diving the time period by 10 in order to get the average time
taken for only one oscillation. For all of my takes, I will be isolating the experiment by
placing the plastic squares in order to avoid any possible disruptions that may come from
the laboratory.
Main Risk Assessment
The new apparatus and the method itself combined do not really add any major dangers to
me and the others or the surroundings. The plastic squares are very light and relatively small
and so do not require any extra precautions. On the other hand, I will be using heavier
equipment because I will be doubling the amount of mass than previously used by up to 1kg
that may potentially be more dangerous than the preliminary outtake. I will therefore take
extra care in my area and attach the spring very securely to the retort stand to eliminate any
possible threats.
Main Dealing with Uncertainty
Unfortunately, I was not able to improve any of my measuring equipment such as the ruler
and the stopwatch. This means that all of my percentage uncertainties will stay the same for
the main experiment. However, I did add measuring equipment – the weighing scale. The
weighing scale measured up to 2 decimal places in grams and so my percentage uncertainty
is worked out like this:
% 𝑢𝑛𝑐𝑒𝑟𝑡𝑎𝑖𝑛𝑡𝑦 = (
± 0.01
𝑎𝑐𝑡𝑢𝑎𝑙 𝑟𝑒𝑎𝑑𝑖𝑛𝑔
) × 100
This percentage uncertainty will be mentioned next to every result obtained for weighing
the masses.
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Main Results and Graphs
Measuring the Spring Stiff Constant
Average Results
Mass (kg)
[±0.01]
Force (N)
[±0.0981]
Extension (m)
[±0.0005]
0.09904 0.972 3.20×10-2
0.19977 1.960 7.20×10-2
0.29972 2.940 10.8×10-2
0.39954 3.919 14.5×10-2
0.49983 4.903 18.5×10-2
0.60233 5.909 22.3×10-2
0.70286 6.895 26.3×10-2
0.80107 7.858 30.4×10-2
0.90090 8.838 34.4×10-2
1.00053 9.815 38.1×10-2
Force-ExtensionGraph
Spring Stiff Constant = 25.283Nm-1
In this case the equation of the line is 𝑦 = 25.283𝑥 + 0.2006. So the gradient is 25.283.
y = 25.283x + 0.2006
0
2
4
6
8
10
12
0 0.1 0.2 0.3 0.4 0.5
Force[±0.0981](N)
Extension [±0.0005] (m)
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Measuring the Effect of Mass on Time Period
Average Results
Mass (kg) 10 Periods (s) Period (s) (Period)2
(s)
0.09904 3.588 0.359 0.129
0.19977 5.045 0.505 0.255
0.29972 6.097 0.610 0.372
0.39954 7.055 0.706 0.498
0.49983 7.818 0.782 0.611
0.60233 8.518 0.852 0.726
0.70286 9.138 0.914 0.835
0.80107 9.692 0.969 0.939
0.90090 10.187 1.019 1.038
1.00053 10.647 1.065 1.134
(Period)2
-Mass Graph
y = 1.118x + 0.038
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 0.2 0.4 0.6 0.8 1 1.2
(Period)2(s)
Mass (kg)
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Main Conclusion and Evaluation
Evaluating the Results of Measurementof the Spring Stiff Constant and Time
Period
𝑇2
= 4𝜋2
𝑚
𝑘
𝑔𝑟𝑎𝑑𝑖𝑒𝑛𝑡 =
4𝜋2
𝑘
𝒌 =
𝟒𝝅 𝟐
𝒈𝒓𝒂𝒅𝒊𝒆𝒏𝒕
=
𝟒𝝅 𝟐
𝟏. 𝟏𝟏𝟖
= 𝟑𝟓. 𝟑𝟏𝟐𝑵𝒎−𝟏
This was a very odd result and differed from all the others that I’ve obtained. In this
experiment I carefully measured every mass that I attached to the spring and used it to work
out the force. Because the amount of precision that I used changed, it most likely
contributed to this odd result. For example; instead of writing 0.1kg, I weighted the mass
and got 0.09904kg. I did the same for all the other masses. This means that just because the
result is different from all the others, it does not mean it is wrong or inaccurate since the
precision was much higher than before. On the other hand however, out of the four
experiments that I did (2 preliminary and 2 main), the other three all showed a similar result
and therefore I will still assume that the odd result obtained is still most likely to be faulty.
After collecting my results, I decided to compare the time periods that I’ve obtained with
those that I’ve worked out from the Time Period Equation; 𝑇 = 2𝜋√
𝑚
𝑘
Here is a table that compares the obtained time periods, with the time periods worked
out from the equation:
As ‘m’ - mass, I will be using the values obtained in the main experiment
As ‘k’ – spring stiff constant, I will be using the average of the spring stiff constants
that I’ve worked out in both of the preliminary and one of the main experiments. I am
excluding the very last one because it showed to be very different –
=
24.468+26.398 +25.283
3
= 𝟐𝟓. 𝟑𝟖𝟑𝑵𝒎−𝟏
The values for the time periods that I’ve worked out in the main experiment is the
average of all of the six takes
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Mass (kg) Time periods worked
out from the main
experiment
Time period using; 𝑻 =
𝟐𝝅√
𝒎
𝒌
0.09904 0.359 0.385
0.19977 0.505 0.546
0.29972 0.610 0.669
0.39954 0.706 0.773
0.49983 0.782 0.864
0.60233 0.852 0.949
0.70286 0.914 1.025
0.80107 0.969 1.094
0.90090 1.019 1.160
1.00053 1.065 1.223
From looking at the data, I can say that my results were similar to those calculated using the
equation, even though they varied slightly. The uncertainty in this case is small and so my
data proves to be reliable. Observing the table above, I’ve noticed that as the added mass
gets greater, the difference between the two time periods increases – this is a similar case
that occurred with the spring stiff constant. A possible explanation for this would be to say
that as I added more mass, the oscillation was more vigorous – by that I mean that as the
system was oscillating, the attached mass was not progressing in a straight manner, instead
it would move from side to side at different times of the oscillation. This made it much
harder for me to calculate the true value for the time period.
At last, I would also like to add another important key point. It is already known that Time
Period is Proportional to the Square Root of Mass. I can see if my results are correct by also
checking them with this statement;
If 𝑻 ∝ √ 𝒎
I can take out the two necessary values from the table above and work out the constant
between the time period and the square root of mass. I will choose the very first row;
mass of 0.09904kg and the period of 0.359s.
I get; 0.359 ∝ √ 𝟎. 𝟎𝟗𝟗𝟎𝟒
So 0.359 = c√ 𝟎. 𝟎𝟗𝟗𝟎𝟒
And so c =
𝟎.𝟑𝟓𝟗
√𝟎.𝟎𝟗𝟗𝟎𝟒
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Now that I’ve calculated my constant, I can use it to find other Time periods by knowing the
mass attached to the spring. I will check this with the second row, using a value of
0.19977kg to give me a period of around 0.505s.
𝑻 =
𝟎. 𝟑𝟓𝟗
√ 𝟎. 𝟎𝟗𝟗𝟎𝟒
× √𝟎. 𝟏𝟗𝟗𝟕𝟕 = 𝟎. 𝟓𝟏𝟎𝒔
Again, the value that I calculated using an equation of proportionality gave me a very similar
result to one I’ve obtained in the practical.
Final Conclusion
Throughout both, the preliminary and the main experiments, there was a lot of evidence
suggesting that when I improved my techniques of obtaining the results, my data proved to
be more accurate and reliable. These improvements consisted of measuring the masses on
an accurate scale as well as increasing the amount of mass attached to the spring.
In overall, the data in the real experiment proved to be more precise when I compared
some of the results with the ones that worked out using the different formulae.
The End
24. Tibor Astrab
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Appendices
Equations and BackgroundPhysics
CGP A2 Level Physics – Complete Revision and Practice
Advancing Physics A2 – OCR B
Advancing Physics – A2 Course Booklet Fortismere School Physics Department
Graphs of Displacement, Velocity andAcceleration
CGP A2 Level Physics – Complete Revision and Practice
Google Images
Percentage Uncertainty
CGP AS Level Physics – Complete revision and Practice
Advancing Physics – A2 Course Booklet Fortismere School Physics Department