Advanced/Notes 6.1
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Work is defined as the distance an object is moved in the direction of the applied force. The unit of work is the Joule. Work is calculated by multiplying the force acting on an object by the distance the object moves in the direction of the force. Forces acting opposite to the direction of motion do negative work. To solve work problems, draw a free body diagram, choose a coordinate system, determine any unknown forces using Newton's laws, calculate the work done by each force, and add the work values to determine the net work.
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Work is defined as the product of the force applied to an object and the displacement of the object in the direction of the force. Work is only done when there is a component of force in the direction of motion. No work is done when the force is perpendicular to the displacement. Work has units of joules (J), which is calculated as newton-meters (N⋅m). Examples are provided to demonstrate calculating work done by applying different forces over various displacements and angles.
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This document discusses the meaning, units, and SI unit of measurement for work. Work is defined as the product of the applied force and the distance moved in the direction of the force. The unit for force is the Newton (N), the unit for distance is the meter (m), and therefore the unit for work is the Newton meter (Nm). However, the standard SI unit for work is the Joule (J), where 1 Joule is equal to the work done by a 1 Newton force to move an object 1 meter.
2627970156341125
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Analyzing forces in equilibrium
W = mg = 0.05kg x 10N/kg = 0.5N
θ = 40°
Using resolution of forces:
Py = W sinθ
= 0.5N sin40°
= 0.33N
Px = W cosθ
= 0.5N cos40°
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Therefore, the magnitude of the weight parallel to the inclined plane (Px) is 0.43N.
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Forces acting on a body can be represented by a single resultant force, which is the combination of all the individual forces. The resultant force, denoted by R, replaces multiple forces and produces their combined effect. An equilibrant force, denoted by E, is equal in magnitude but opposite in direction to the resultant force, keeping the body in equilibrium.
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Work is done when a force causes an object to displace. There are three types of work: positive work occurs when force and displacement are in the same direction, negative work when they are opposite, and zero work when no displacement happens. Energy is the ability to do work and comes in kinetic and potential forms. Kinetic energy is the energy from motion and equals 1/2mv^2, while potential energy depends on position and equals mgh.
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Analyzing forces in equilibrium
W = mg = 0.05kg x 10N/kg = 0.5N
θ = 40°
Using resolution of forces:
Py = W sinθ
= 0.5N sin40°
= 0.33N
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3) Vectors and scalars, where vectors represent quantities that have both magnitude and direction while scalars only have magnitude.
4) The parallelogram rule is used to determine the resultant, or combined effect, of two forces acting on an object by constructing a parallelogram with the forces as the sides.
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Yearly scheme of work y2 2015
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Regalos El Ekeko
La Unión Europea ha acordado un paquete de sanciones contra Rusia por su invasión de Ucrania. Las sanciones incluyen restricciones a las transacciones con bancos rusos clave y la prohibición de la venta de aviones y equipos a Rusia. Los líderes de la UE esperan que las sanciones aumenten la presión económica sobre Rusia y la disuadan de continuar su agresión contra Ucrania.
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This document provides an overview of Newton's laws of motion. It defines key concepts like force, mass, weight, balanced and unbalanced forces. It then explains each of Newton's three laws of motion - (1) an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force, (2) acceleration is directly proportional to net force and inversely proportional to mass, and (3) for every action there is an equal and opposite reaction. The document also discusses free body diagrams and uses examples to demonstrate how to apply Newton's laws to solve problems involving forces, friction, and motion on inclined planes.
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This document summarizes key concepts from Chapter 4 of Holt Physics about forces and the laws of motion. It discusses the different types of forces, how to draw free-body diagrams, Newton's three laws of motion, mass vs weight, friction, and how to solve problems involving forces. The key points are that forces cause acceleration according to Newton's Second Law, inertia is an object's resistance to changes in motion, and forces always occur in equal pairs according to Newton's Third Law.
P11.-WORK.ppt
Here are the answers:
1. Work = Force x Distance
= 50N x 10m
= 500 Joules
2. Work = Force x Distance
= Weight x Height
= 45 kg x 9.8 m/s^2 x 1.2m
= 546.4 Joules
3. Total Force = Tom's Force + Jerry's Force = 50N + 70N = 120N
Work = Total Force x Distance
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= 480 Joules
Work and energy. Practical Problems on Work and Energy
1. Work is defined as the product of the applied force and the displacement of an object in the direction of the force. Only the component of force parallel to the object's motion does work.
2. The basic work equation is Work = Force x Displacement. Different types of work problems can involve overcoming friction, gravity, or no forces.
3. Energy is the ability to do work and exists in various forms like kinetic and potential energy. The work-energy theorem states that the work done on an object equals its change in kinetic energy.
Force and acceleration simplified
Forces can push or pull on objects and change their motion. A force is measured in Newtons. The net force on an object determines its acceleration according to F=ma. Newton's three laws describe how forces interact: 1) objects in motion stay in motion unless a force acts; 2) F=ma; 3) for every action there is an equal and opposite reaction. Centripetal force provides the inward pull that causes objects to travel in circular paths. Stability depends on the location of an object's center of mass relative to its base.
Force and acceleration simplified
Forces can push or pull on objects and change their motion. A force is measured in Newtons. The net force on an object determines its acceleration according to F=ma. Newton's three laws describe how forces interact: 1) objects in motion stay in motion unless a force acts, 2) F=ma, and 3) for every action there is an equal and opposite reaction. Centripetal force provides the inward force needed for circular motion. Levers, moments, and fulcrums can be used to make work easier by reducing the needed force. The location of an object's center of mass determines its stability.
Work
1) Work is defined as a force acting upon an object to cause displacement and is expressed as the product of force and displacement in the direction of force.
2) The work done on a body depends on the magnitude of the force and the displacement through which the body moves in the direction of force.
3) As the angle between the direction of force and motion of the body increases, less work is done along the direction of motion since less of the force is acting in that direction.
1st Lec Ch #5.pptx
Newton's laws of motion describe the relationship between an object and the forces acting upon it, and its response to those forces. The three laws are:
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Work
Work in physics has a clear definition - it is the product of the component of a force along the direction of displacement and the magnitude of the displacement. For a constant force F applied parallel to an object's displacement x on a horizontal surface, the work done is defined as F x. Work is also equal to the force component parallel to displacement (F cos θ) multiplied by the displacement (x). One Joule is the work done by a force of 1 Newton through a displacement of 1 meter.
Work and energy part a
The document discusses work, energy, and the work-energy principle as an alternative way to analyze motion compared to using forces and Newton's laws. It defines key terms like work, kinetic energy, and systems. The work-energy principle states that the net work done on an object equals its change in kinetic energy (Wnet = ΔKE). This allows reexpressing Newton's second law in terms of energy rather than forces. Examples show how to calculate work, kinetic energy, and use the work-energy principle to solve motion problems.
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Newton's laws of motion 14 april 2015
Here are the steps to solve this problem:
a) Since the buckets are at rest, the tension in each cord must balance the weight of the bucket it supports. Therefore, the tension is 3.2 kg * 9.8 m/s2 = 31.36 N
b) Applying Newton's Second Law to each bucket:
Upper bucket: Tension - Weight = Mass * Acceleration
Tension - 3.2 kg * 9.8 m/s2 = 3.2 kg * 1.6 m/s2
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Lower bucket: Tension - Weight = Mass * Acceleration
Tension - 3.
Hp 04 win
This document provides instructions for navigating a presentation on forces and motion. It begins with directions for viewing the presentation as a slideshow. The table of contents lists the sections and lessons. Section 1 discusses changes in motion and includes topics like force, force diagrams, and Newton's first law. Section 2 covers Newton's first law in more detail. Section 3 explains Newton's second and third laws. Section 4 defines terms like weight, normal force, friction, and air resistance. The document concludes with sample multiple choice questions.
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This document provides instructions for navigating a presentation on physics concepts. It outlines how to view the presentation as a slideshow and advance through it. The table of contents lists four sections that cover changes in motion, Newton's laws of motion, everyday forces, and sample problems. Force diagrams and free-body diagrams are used to represent forces acting on objects. Newton's three laws of motion relate forces, mass, and acceleration. Friction and normal forces are types of contact forces that oppose motion.
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This document provides instructions for navigating a presentation on forces and motion. It begins with directions for viewing the presentation as a slideshow. The table of contents lists the sections and lessons. Section 1 discusses changes in motion and includes topics like force, force diagrams, and Newton's first law. Section 2 covers Newton's first law in more detail. Section 3 explains Newton's second and third laws. Section 4 defines terms like weight, friction, and air resistance. The document concludes with sample multiple choice questions.
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This document contains excerpts from a physics textbook. It discusses forces, Newton's laws of motion, and related concepts. The key points are:
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2) Newton's second law relates an object's acceleration to the net force acting on it and its mass. Net force equals mass times acceleration.
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4)
6-a-work-energy-power.ppt
1. The document discusses different topics related to work, energy and power including dot product, definitions of work and energy, forms of energy, kinetic energy, work-energy theorem, and potential energy.
2. Key concepts covered are the mathematical definitions of work as the product of force and displacement, and of kinetic energy as one-half mass times velocity squared.
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This document provides an overview of work, energy, and potential energy concepts from a physics textbook chapter. It defines key terms like kinetic energy, potential energy, conservative forces, and introduces the work-energy theorem. Examples of calculating work done by gravity and changes in kinetic and potential energy are presented. The history of Joule's experiment demonstrating the equivalence between work, heat, and energy transfer is briefly described.
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To solve static problems:
1. Make a free-body diagram showing all forces on each object.
2. Choose a coordinate system and resolve forces into components.
3. Write equilibrium equations for the sum of forces in each direction and the sum of torques.
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Advanced/Notes 8.4
Torque is calculated based on the lever arm, which is the perpendicular distance from the axis of rotation to the point where a force is applied. A longer lever arm results in a greater torque. An example calculates the torque on a bicep muscle attached 5 cm from the elbow joint, based on different forces applied. A second example calculates the net torque on two connected wheels from two 50N forces, based on the wheels' radii serving as lever arms. The document concludes by assigning homework problems related to torque calculations.
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Advanced/Notes 6.1
- 1. Chapter 6 Work and Energy
- 2. Section 6.1 Work Done by a Constant Force How can I calculate the amount of work done by a force?
- 3. Work The work done by a constant force is defined as the distance moved multiplied by the component of the force in the direction of displacement
- 4. Work Since Work is force times distance Unit is the Joule 1J=1N·m
- 5. Work or Not? Need a component of force in same direction as motion If he does not raise or lower the bag, no work
- 6. Strategy Solving work problems: 1. Draw a free-body diagram. 2. Choose a coordinate system. 3. Apply Newton’s laws to determine any unknown forces. 4. Find the work done by a specific force. 5. To find the net work, either find the net force and then find the work it does, or find the work done by each force and add.
- 7. Negative Work Work done by forces that oppose the direction of motion, such as friction, will be negative Centripetal forces do no work, as they are always perpendicular to the direction of motion
- 8. Example A person pulls a 50 kg crate 40 m along a horizontal floor by a constant force Fp = 100 N, which acts at a 37° angle as shown. The floor is rough and exerts a friction force Ff = 50 N. Determine (a) the work done by each force acting on the crate, (b) the net work done on the crate.
- 9. Homework Page 162 # 1 - 10