Work Done
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The document discusses calculating work done using the equation work = force x distance, providing examples of calculating work done for different exercises using body weight or additional weights as force and measuring the distance moved. Learners are asked to practice rearranging the work done equation, converting between units, and calculating work done for various scenarios involving forces over different distances.
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Work and Energy in Physics
This document provides information about work, energy, and the different types of energy. It begins with definitions of work and discusses how work is calculated based on force and distance. It then defines different types of energy including kinetic energy, potential energy, heat energy, chemical energy, electromagnetic energy, and nuclear energy. Examples are provided to demonstrate how to calculate work, kinetic energy, and potential energy. The last sections discuss conservative and non-conservative forces and how the law of conservation of energy applies.
Work and Energy
The document discusses various physics concepts related to work, energy and power including:
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- Kinetic energy and its formula. Kinetic energy depends on an object's mass and velocity.
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- The principles of conservation and conversion of energy. Energy cannot be created or destroyed, it can only change form.
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The document defines work in physics as being done when a force causes an object to move through a displacement. It provides the mathematical formula for work as W = Fd, where W is work, F is the applied force, and d is the displacement. It also states that work is a scalar quantity and defines the SI unit of work as the joule. Examples of positive, negative, and zero work are given based on whether the force and displacement are in the same, opposite, or perpendicular directions.
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The document defines work in physics as a force causing an object to be displaced. It provides the equation for calculating work (W = F x d) where work (W) equals force (F) multiplied by displacement (d). The document gives examples of calculating work done by lifting masses over different distances and solving practice problems using the work equation.
WORK POWER AND ENERGY
1) Work is defined as the product of the net force acting on a body and the distance moved in the direction of the force. The SI unit for work is the joule.
2) Power is defined as the rate at which work is done. It is measured in watts, which are equal to one joule per second.
3) There are two main types of energy: kinetic energy, which is the energy of motion, and potential energy, which is stored energy due to an object's position or composition. The SI unit for both is the joule. According to the law of conservation of energy, the total energy in an isolated system remains constant.
Law of inertia
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The document outlines key concepts related to work, energy, and power including defining these terms, calculating kinetic and potential energy using formulas, stating the principle of conservation of energy as it relates to the conversion of energy forms, applying these concepts to solve related problems, and calculating mechanical system efficiency. The goal is to understand these fundamental physics concepts and be able to measure, calculate and apply work, energy and power.
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The document discusses energy, work, and power, defining these concepts and how they relate. It explains that energy can be converted from one form to another but is never created or destroyed according to the law of conservation of energy. Assessment tasks are provided to evaluate understanding of energy transfer and transformation within closed systems.
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The document discusses various physics concepts related to work, energy and power including:
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- Kinetic energy and its formula. Kinetic energy depends on an object's mass and velocity.
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The document defines work in physics as being done when a force causes an object to move through a displacement. It provides the mathematical formula for work as W = Fd, where W is work, F is the applied force, and d is the displacement. It also states that work is a scalar quantity and defines the SI unit of work as the joule. Examples of positive, negative, and zero work are given based on whether the force and displacement are in the same, opposite, or perpendicular directions.
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The document defines work in physics as a force causing an object to be displaced. It provides the equation for calculating work (W = F x d) where work (W) equals force (F) multiplied by displacement (d). The document gives examples of calculating work done by lifting masses over different distances and solving practice problems using the work equation.
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1) Work is defined as the product of the net force acting on a body and the distance moved in the direction of the force. The SI unit for work is the joule.
2) Power is defined as the rate at which work is done. It is measured in watts, which are equal to one joule per second.
3) There are two main types of energy: kinetic energy, which is the energy of motion, and potential energy, which is stored energy due to an object's position or composition. The SI unit for both is the joule. According to the law of conservation of energy, the total energy in an isolated system remains constant.
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1) The document discusses work, energy, and their relationship through the work-energy theorem. It defines work as the product of force and displacement and distinguishes between different types of work.
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Work involves transferring energy by applying a force that causes an object to move in the direction of the force. For work to be done, both a force and movement are required. The amount of work done can be calculated using the formula Work = Force x Distance, where force is measured in Newtons and distance in meters, with the unit of work being the Joule. When work is done, energy is transferred from the object applying the force to the object being moved.
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This document covers concepts related to work, energy, and power. It begins by defining work as the mechanical transfer of energy due to external forces, and is equal to the product of the force and the displacement in the direction of the force. Various examples are provided to illustrate situations where work is and isn't being done. The relationship between work and energy transfer is explained. Kinetic and potential energy are introduced, and analogies are provided. Methods for calculating work, energy, and power are demonstrated through examples.
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This document discusses different types of forces. It begins by explaining that moving objects are said to be in motion. It then states that a push or pull acting on an object is called a force. The document goes on to list and briefly describe four main types of forces: gravitational force, magnetic force, nuclear force, and muscular force.
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- The equation for Newton's second law is: Force = mass x acceleration (F=ma), where the SI unit for force is the Newton.
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The document discusses key concepts related to motion including speed, velocity, acceleration, and frames of reference. It defines speed as distance traveled over time, velocity as including both speed and direction making it a vector quantity, and acceleration as how velocity changes over time either in magnitude or direction. Examples are provided to demonstrate calculating speed, velocity, and acceleration using formulas.
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Kinetic energy
This document discusses kinetic energy. It defines kinetic energy as the energy of a moving object or energy in motion. The formula for calculating kinetic energy is provided as KE = 1/2mv^2, where m is mass and v is velocity. Examples are given to show how doubling mass doubles kinetic energy, while doubling velocity quadruples kinetic energy. The document also provides an example calculation of the kinetic energy of a 0.10 kg bird flying at 8.0 m/s.
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The document summarizes key concepts relating to work, power, efficiency, and energy flow. It defines work as the transfer of energy through motion requiring a force over a distance. Power is the rate at which work is done or energy is used. Efficiency refers to the ratio of useful energy output to the total energy input. Energy flow diagrams can be used to trace the storage, conversion, transmission and output of energy through a system, identifying losses at each step.
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The document discusses a lesson on forces for students. It aims to have students define force, describe motion as being caused by a push or pull, and determine how forces affect motion. The lesson includes activities where students act out forces, move an object with forces, and stop, accelerate or change the direction of an object's motion. It also defines different types of contact forces like applied force, friction, normal force, and tension.
Momentum
Momentum is a characteristic of moving objects related to its mass and velocity. It is calculated by multiplying mass and velocity, with units of kg*m/s. An object's momentum is in the direction of its velocity, and greater momentum means it is harder to stop the object. Both greater mass and velocity result in higher momentum. The total momentum in a system is conserved during interactions and collisions according to the law of conservation of momentum.
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Momentum is a quantity that expresses the motion of a body, equal to the product of its mass and velocity. The momentum of an object depends on its mass and velocity, with greater mass or velocity resulting in more momentum. The law of conservation of momentum states that in a closed system without external forces, the total momentum before and after an interaction will be the same. Examples include a person recoiling after firing a gun or moving backward when throwing an object off a skateboard. In collisions, the total momentum of the system is conserved and can be expressed mathematically as the sum of the momentum of the objects before equalling the sum after.
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Power is defined in physics as the rate at which work is done or energy is transferred. The equation for power is power equals work done divided by time taken, with units of watts. Calculating power involves determining the work done by an object and dividing it by the time taken to perform that work. Examples are provided of calculating the power of a fork lift truck and a mouse running up a curtain.
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Stay tuned with us or visit. www.vavaclasses.com
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1. Work is the product of the applied force and the displacement along the line of action of the force. Positive work is done when force and displacement are in the same direction, while negative work is done when they are in opposite directions.
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1. Work is the product of the applied force and the displacement along the line of action of the force. Positive work is done when force and displacement are in the same direction, while negative work is done when they are in opposite directions.
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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.
Work, Energy Power rev.pptbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbn
The document discusses work, power, and energy. It defines work as the product of force and displacement along the line of action of the force. Positive work is done when force and motion are in the same direction, and negative work is done when they are opposite. Power is defined as the rate of doing work. Kinetic energy is the energy due to an object's motion and depends on its mass and velocity. Potential energy can be gravitational, depending on an object's mass, height, and gravitational field, or strain, stored in deformed objects. The work-energy theorem states that work done on an object causes a change in its kinetic and potential energies.
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The document discusses various types of energy and forces, explaining that energy cannot be created or destroyed, only changed in form, and defines work as the ability to cause change when a force acts over a distance. It also explains Newton's three laws of motion, including that an object at rest or in motion will remain as such unless acted on by an unbalanced force, and that for every action there is an equal and opposite reaction. The document provides examples and formulas to help understand these concepts of energy, forces, and motion.
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This document discusses the concepts of work, potential energy, and kinetic energy. It provides examples of calculating work using the formula W=Fd, where W is work, F is force, and d is distance. Potential energy is defined as energy due to an object's position and is calculated as PE=mgh, where m is mass, g is gravitational acceleration, and h is height. Kinetic energy is the energy of a moving object and depends on an object's mass and velocity. The document also discusses how power relates to work and time, with greater power requiring more work done in less time.
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Work Done
- 1. Work Done Learning Objectives: 5 - Use the work done equation correctly 6/7 - Rearrange the equation and use it in different forms 8 – Use powers to express or convert units of work What is mass measured in? What is weight measured in? What causes weight? What is energy measured in?
- 2. What have they got in common? 1. Discuss your ideas with your partners 2. When asked, share your ideas with another pair 3. Decide on your group opinion and be ready to explain it W = Fd W = Work done (J) F = Force (N) d = Distance moved (m)
- 4. work done (joule, J) = force (newton, N) × distance (metre, m)
- 5. Exercise Mass (kg) Weight (mass x 10N/kg) This if the force!! (N) Distance per rep (use only the upward distance) (m) Number of reps Total distance (distance per rep x No. reps) (m) Work done (Force x total distance) (J) Squats (use your bodyweight for mass) Bicep curls (using text books) Step ups (use your bodyweight for mass)
- 6. Exercise Mass (kg) Weight (mass x 10N/kg) (N) Distance per rep (use only the upward distance) (m) Number of reps Total distance (distance per rep x No. reps) Work done (Force x total distance) (J) Squats (use your bodyweight for mass) 80 800 0.6 10 6 4,800J Triceps dips (Use half your bodyweight for mass) 40 400 0.4 10 4 1,600J Bicep curls 5 50 0.7 10 7 350J Wrist curls 1 10 0.08 10 0.8 8J Step ups (use your bodyweight for mass) 80 800 0.25 10 2.5 2,000J
- 7. Easy – 1 Mark Medium – 2 Marks Hard – 3 Marks Write the equation to calculate work done. What is the work done if we apply a 1.2N force and we move 4m in the direction of force? Walking up a flight of stairs, what are the energy transfers? Rearrange this equation for force applied. What is the work done if we apply a 7N force and we move 8m in the direction of the force? When you roll a ball down a hill what are the energy transfers? Rearrange this equation for distance moved in the direction of force. What distance is moved if we have a 8N force and the work done is 90J? What is the work done when a force of 5kN is applied to a ball and it moves 0.8km? What is the unit of force? What is the distance moved if we have a 70N force and work done is 8J? What is the work done to a car if a force of 9kN is applied and it moves 7km? What is the unit of work done? What force is required to move 7m if the work done is 9J? What force is required if 2.5kJ moves and object 56cm?
- 8. Easy – 1 Mark Medium – 2 Marks Hard – 3 Marks Write the equation to calculate work done. W = Fd What is the work done if we apply a 1.2N force and we move 4m in the direction of force? 4.8J Walking up a flight of stairs, what are the energy transfers? kinetic (walking), GPE (height) (chem in food and thermal in body) Rearrange this equation for force applied. F = W/d What is the work done if we apply a 7N force and we move 8m in the direction of the force? 56m What energy transfers when a ball rolls down a hill? GPE to kinetic (also thermal) Rearrange this equation for distance moved in the direction of force. d = W/f What distance is moved if we have a 8N force and the work done is 90J? 11.3m What is the work done when a force of 5kN is applied to a ball and it moves 0.8km? 4MJ (4,000,000J) What is the unit of force? Newtons (N) What is the distance moved if we have a 70N force and work done is 8J? 0.1m What is the work done to a car if a force of 9kN is applied and it moves 7km? 63MJ (63,000,000J) What is the unit of work done? Joules (J) What force is required to move 7m if the work done is 9J? 1.3N What force is required if 2.5kJ moves and object 56cm? 4.5kN (4,464N) 24+ = 8 21-23 = 7 18-20 = 6 15-17 = 5
- 9. Squats
- 10. Step Up
- 11. Bicep Curl using a book(s) Weigh the books using the weighing scales- you can decide how many you want to use
- 12. Plenary