Unit d - section 2.1 -- measuring forces
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The document discusses forces and how they affect structures. It explains that forces can cause objects to change movement or shape. Volunteers are asked to demonstrate how different forces like magnitude, direction, and location of application can impact the outcome on a structure. Forces are measured in newtons, with one newton being the force needed to hold 100g.
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The document provides information about forces and work. It defines force as a push or pull and discusses different types of forces including gravitational, frictional, electrostatic, and magnetic forces. It also defines work as the product of the applied force and the distance moved, and power as the rate at which work is done. Methods for reducing friction like lubricants and ball bearings are presented. Examples of calculating work, power, and solving physics problems involving forces are also included.
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This document defines and describes various types of forces including contact forces, non-contact forces, gravity, and net force. It explains that a force is a push or pull on an object that can cause it to start, stop, or change motion. Forces are described by their strength and direction. The SI unit for force is the Newton, and one Newton is approximately the force needed to lift a lime. Forces can be contact forces like friction or non-contact forces like gravity and magnetism. Gravity is the attractive force between all objects with mass. Weight and mass are related but different, as weight can change with gravity but mass does not. Net force is calculated by adding or subtracting forces based on their direction.
FORCE | CONTACT AND NON-CONTACT FORCES
Forces can cause changes in an object's motion or form. A contact force requires direct contact between objects, like frictional or muscular forces, while a non-contact force acts over a distance without touching, such as gravitational, magnetic, or nuclear forces. Forces are interactions that can change the motion of an object when unopposed.
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Forces can be categorized as either contact forces or non-contact forces. Contact forces require direct physical contact between objects and include applied force, normal force, friction, tension, and spring force. Non-contact forces act over a distance and include gravitational force, electrical force, and magnetic force. A net force is the single force equivalent to multiple forces acting on an object. An unbalanced net force will cause acceleration, while a balanced net force where forces are equal will not change an object's motion. Common units for measuring force include the newton.
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This document discusses different types of forces including gravitational, magnetic, electrostatic, mechanical, buoyant, and frictional forces. It provides examples of each force and explains their effects. Gravitational force attracts objects to Earth. Magnetic force attracts metals like iron. Electrostatic force acts between charged bodies. Mechanical force requires physical contact to push or pull objects. Buoyant force pushes objects up in water. Frictional force opposes the movement of objects and can slow or stop their motion. Friction allows walking and vehicles to move but also generates heat and causes wear over time.
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A force is any influence that causes an object to change its movement, direction, or shape. Forces can make an object begin moving, change speed or direction of motion, or cause a flexible object to deform. There are two main types of forces: contact forces, which act between objects in direct contact, and non-contact forces, which act over a distance. Contact forces include normal forces, friction, and tension. Non-contact forces include gravitational, electric, and magnetic forces. Newton's laws of motion describe how forces cause motion or changes in motion.
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This document defines and describes various types of forces including contact forces, non-contact forces, gravity, and net force. It explains that a force is a push or pull on an object that can cause it to start, stop, or change motion. Forces are described by their strength and direction. The SI unit for force is the Newton, and one Newton is approximately the force needed to lift a lime. Forces can be contact forces like friction or non-contact forces like gravity and magnetism. Gravity is the attractive force between all objects with mass. Weight and mass are related but different, as weight can change with gravity but mass does not. Net force is calculated by adding or subtracting forces based on their direction.
FORCE | CONTACT AND NON-CONTACT FORCES
Forces can cause changes in an object's motion or form. A contact force requires direct contact between objects, like frictional or muscular forces, while a non-contact force acts over a distance without touching, such as gravitational, magnetic, or nuclear forces. Forces are interactions that can change the motion of an object when unopposed.
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Forces can be categorized as either contact forces or non-contact forces. Contact forces require direct physical contact between objects and include applied force, normal force, friction, tension, and spring force. Non-contact forces act over a distance and include gravitational force, electrical force, and magnetic force. A net force is the single force equivalent to multiple forces acting on an object. An unbalanced net force will cause acceleration, while a balanced net force where forces are equal will not change an object's motion. Common units for measuring force include the newton.
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1
Newton's first law of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Inertia is an object's resistance to changes in its motion, and a more massive object has greater inertia. Forces are balanced when their net force is zero, and unbalanced when the net force is nonzero.
482564411-Newton-s-Laws-of-Motion-by-joy.pptx
Newton's laws of motion describe the relationship between an object and the forces acting upon it, and its motion in response to those forces. The three laws are: 1) An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force. 2) The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the direction of the net force. 3) For every action, there is an equal and opposite reaction.
Force & motion notes 2014 2015
This document discusses forces and motion. It defines key terms like force, net force, balanced and unbalanced forces. It explains that an object's motion can only be determined relative to another object used as a reference point. Forces can be added or subtracted depending on whether they act in the same or opposite directions. A net force causes an object to change its motion, such as starting to move, stopping, or changing direction. Balanced forces in opposite directions do not change an object's motion.
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To reverse or irreverse t chart
Reversible processes can be reversed by changing conditions while irreversible processes result in increased entropy and cannot be reversed. Many natural processes are irreversible, such as heat transfer from a hot object to a cold one, or chemical reactions that produce waste. While reversible processes are theoretically possible, most natural processes occur irreversibly.
Reverseirreverse examples
The document describes various chemical and physical changes that occur when different substances interact or are exposed to different conditions. Some examples provided include peas freezing hard, whisked eggs scrambling when heated, ALKA-seltzer fizzing when added to water, ice cream melting in the sun, wax burning when a candle is lit, coal turning to ashes when burned, and iron rusting when exposed to water.
Irreversible changes
The document contains instructions and observations for 5 student groups to conduct experiments on reversible and irreversible changes. Group 1 mixes different substances with water, vinegar or lemon juice to observe reactions. Group 2 burns various materials to observe changes. Group 3 heats materials like chocolate or ice to see effects. Group 4 uses plaster of Paris and notes its properties. Group 5 observes dough rising before and after leaving it to rise, and describes the process.
Irreversible changes
The document contains instructions and observations for 5 student groups to conduct experiments on reversible and irreversible changes. Group 1 mixes different substances with water, vinegar or lemon juice to observe if reactions are reversible or irreversible. Group 2 burns different materials to observe changes. Group 3 heats materials to observe melting or other changes. Group 4 uses plaster of Paris and notes its properties. Group 5 observes dough rising before and after leaving it to rise.
To reverse or irreverse t chart
Reversible processes can be reversed to return to the original state, while irreversible processes result in changes that cannot be undone, such as breaking an egg or burning fuel that produces heat and exhaust. Many natural processes are considered irreversible, including biological aging and the diffusion of molecules over time.
To reverse or irreverse t chart
Reversible processes can be reversed to return to the original state, while irreversible processes result in changes that cannot be undone, such as breaking an egg or burning fuel that produces heat and exhaust. Many natural processes are considered irreversible, including biological aging and the diffusion of molecules over time.
Science practice quiz
The document provides a science practice quiz that tests students' abilities to classify materials by state of matter, identify types of mixtures as solid-solid, solid-liquid, or liquid-liquid, and determine the best separation technique to use for different mixtures. Students are asked to organize examples like wood, paper, milk, oxygen into solid, liquid, or gas categories and identify mixtures as solid-solid, solid-liquid, or liquid-liquid. They are also asked to determine whether a magnet, sieve, water, or air would be best to separate mixtures like sand and metal fillings.
Techniques for separating materials
This document discusses different techniques that can be used to separate materials. Two techniques are described but their details are not provided. The first technique may be a good option to use as it effectively separates materials with minimal downsides. However, the second technique is not recommended due to potential issues in the separation process. In general, the document examines various methods for separating mixtures of materials and evaluates their suitability.
Pure substances vs mixtures
Pure substances are made up of only one type of material, while mixtures are made up of two or more materials mixed together. Examples of pure substances include water, salt, and sugar, whereas mixtures include air, seawater, and mixtures of different types of sand.
Intro and lesson 1
Matter is made up of very small particles that come together to form different states: solids have particles packed closely together, liquids have particles packed loosely that take the shape of their container, and gases have particles that are not connected and fly freely. Chemistry studies compounds, which are substances created by combining two or more other substances together, focusing on combinations of solids or combinations of solids and liquids at grade 5.
Unit c review
This document defines and describes key optical terms and concepts. It explains the differences between concave and convex lenses and mirrors, and how they bend and focus light. It also defines transparency, reflection, bioluminescence, and the parts of the eye. Various light properties and production methods are outlined as well, including amplitude, wavelength, frequency, fluorescence, and the electromagnetic spectrum.
Unit d review
The document discusses the six types of simple machines: levers, screws, wedges, ramps, wheels and axles, and pulleys. It explains how fulcrums are used in levers and describes mechanical advantage and efficiency. Compound machines, gears, and work are also defined. Hydraulics and pneumatics are mentioned as using pressure from liquids and gases, respectively, to lift objects.
Review of grade 8 science blog
The document outlines the different hazard classes used to classify dangerous goods, including compressed gases, flammable and combustible materials, oxidizing materials, poisonous and infectious materials, corrosive materials, and dangerously reactive materials. Each hazard class is defined and examples of the types of materials that fall into each class are provided. Common hazard symbols associated with each class are also displayed and explained.
Unit d - section 3.2 -- technology develops through change
Over the years, technology has advanced significantly through improvements and new developments. Many modern technologies were not created perfectly on the first try but were refined over time based on experimentation. Electricity was a major advancement that enabled the creation of a vast array of modern equipment and allowed technologies like cell phones and computers to emerge and be improved upon over decades. As technology progresses, it influences society in areas like manufacturing, the environment, and daily life.
Unit d - section 2.3 -- hydraulics
Hydraulic systems use liquid under pressure to increase mechanical advantage. They allow heavy loads to be moved more easily and safely than was possible with simple machines. Hydraulics work through Pascal's law - pressure applied to an input piston is distributed equally throughout the liquid and exerts force on a larger output piston, multiplying the mechanical advantage. This principle enables construction projects to be completed more efficiently using hydraulics rather than manual labor alone.
Unit d review quiz
The document is a review package about structures and forces. It contains multiple choice questions about different types of structures like solid, frame, and shell structures. It also asks questions about concepts like center of gravity, static vs dynamic loads, and types of forces like tension, compression, and shear. There are also short answer questions asking about the differences between solid, frame and shell structures; why houses have different roof types; what happens when a structure's center of gravity is off to one side; and the differences between internal and external forces.
Unit d - section 2.3 -- external forces
Internal forces act within a structure and include compression, tension, and shear. Compression squeezes parts together, tension stretches and pulls them apart, and shear pushes parts in opposite directions. These three forces often work together as complementary forces, such as in bending where both compression and tension are involved, and understanding their interactions can help engineers improve structural design.
Unit d - 2.2 external forces
The document discusses external forces like gravity that act on structures. Gravity pulls down with force based on an object's mass. For stability, structures are designed to keep the center of gravity low by increasing the base or placing more mass near the bottom. Bridges must withstand both static loads like their own weight, as well as dynamic loads like moving traffic that change over time. Common bridge types include beams, trusses, cables, and arches.
Mission to mars project
This document outlines an assignment for students to plan and present a mission to Mars. It provides context and requirements for the assignment. Students will be divided into teams of four to plan their mission. Each team must create a 10 slide PowerPoint presentation covering the following mini missions:
1) Describing the characteristics of Mars including temperature, atmosphere, surface features, and why it is known as the "Red Planet".
2) Determining the type of clothing required to survive on Mars and its necessary qualities for heat retention.
3) Choosing materials to build a shelter from 5 allowed options and justify the selections as well as power sources and insulators for equipment without fossil fuels.
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Unit d - section 2.1 -- measuring forces
- 2. Is a push or pull that tends to cause objects to change its movement or shape Lets look at a the most famous force in the world in an experiment I need volunteers….
- 4. These are the primary forces that cause the effect on the structure Each brings a different cause to the structure This will be proved with you demonstrating how these principles work!!!
- 5. This has to do with the actual strength of the force that is being applied to the structure This force can cause devastating effects if a strong force acts on a weak structure However, the effect of this force depends on how massive the structure is
- 6. The direction of the force acts on a structure also determines what effect it will have on the structure itself Imagine you are pushing a fridge up a ramp and down a ramp, which is easier to do? Even though you are applying the same amount of magnitude, the direction is different an causes the ease/difficulty
- 7. The location where a force applies affects the outcome Applying a force at a point high up on an object can cause the object to tip over Pushing an object low may cause it to slide along a floor
- 8. Discovered by Sir Isaac Newton This is the standard unit for measuring force One newton (N) is the amount of force needed to hold up a mass of 100g That is equal to you holding an apple, holing 1-kg requires 10N of force