# What Is The Difference Between Work And Power

What Is The Difference Between Work And Power – 2 What is work? Work is done when a force causes a change in the motion of an object The motion of the object must be in the same direction as the force. Work = ZERO if there is no movement.

Is work being done? Yes, motion and force are in the same direction. When the bar is above his head, he holds it for 3 seconds. No, there is no movement.

## What Is The Difference Between Work And Power

4 Another example Dora lifted her back to put it on. As soon as it was on, he ran out the door to start exploring. Is the bag being worked on? Yes, when the bag is taken. Not while Dora was carrying her bag out the door.

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If I use the words: push, pull, lift or throw, WORK is done if there is movement If you walk or run, work Carry or hold, NO WORK is done because any movement is in a different direction than the force. Exception: Carrying objects up stairs is work

W = F x d Work measurement: joules in newtons * meters 1 joule = 1 N*m = 1 kg*m/s2 * m

1 joule of energy is the energy required to lift an apple from the waist to the head.

8. Exercise Imagine a father playing with his daughter, lifting her several times in the air. How much work does he do on the child with each lift, assuming he lifts him 2.0 m and applies a force of 190 N?

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The SI unit is the watt. 1 watt is the amount of power required to do 1 J of work in 1 second

10 Work vs. Power Running and climbing stairs require the same amount of work – how? Same force, same distance = same work Running faster gives up – what does that say about strength?

11 Strength training Rowing across a lake during a race, John puts out 3,960 joules with his oar in the 60s. What is rowing power?

12 Practice Power 100 kJ of work is required to lift an elevator 18 m. If this is done for 20s, what is the average lift force during the process? (tip: convert to joules)

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13 Power Practice If a person pushes a lawnmower with a force of 500 N a distance of 20 m in 120 seconds, what power is required?

To operate this website, we record user data and share it with processors. To use this website, you must agree to our Privacy Policy, including our Cookie Policy. To recognize the difference between ‘work’ and work Today’s Question: If I hold a 10 kg box above my head for 15 seconds, how much work is done?

3 Work Work has its own meaning in science that is often misused in everyday speech (similar to weight) Work is done on an object when a force causes a displacement W = Fd w = work F = force d = displacement

4 Work The SI unit of work is the joule (J), named after James Prescott Joule 1Nm = 1J = 1kgm2/s2 1 J of work is done by a force of 1N moving an object 1m.

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5 Work Work will NOT be done unless the applied force changes the object’s position Example: A boy pulls a sled with a horizontal force of 100N for 10m, how much work is done on the sled?

6 Work A man lifts a box with a force of 50N to a height of 80cm. Calculate how much work he did on the box. If he carries the box to a table 5 m away, how much work has he done by now? 0.8m Timer W = 40J

If I really tire myself out by using a lot of force to push against the wall, am I doing work? What is the work equation? What two things depend on work?

11 Powers A rock climber and a hiker both go to the same place, so they do the same work. However, rock climbers may take longer to get there, meaning their STRENGTH is much lower.

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W = work done by the object (J) t = time taken to do work (i) Watt is a joke unit of power To run up a flight of stairs instead of walking down it because of less time.

13 Power Example problem 1 A motor does 6000 J of work in 40 seconds. What is the power of the motor? Example Problem 2 The amount of force required to move an object can be increased without changing the amount of work done. How to?

14 Question of the Day Today’s Question: If I hold a 10 kg box above my head for 15 seconds, how much work is done? The answer is 0J because the box is not moving.

To operate this website, we record user data and share it with processors. To use this site, you must agree to our Privacy Policy, including our Cookie Policy.2 Work Work: These words look the same, but have a different meaning in physics than the way they are used in everyday language.

#### Work, Energy And Power Study Guide

3 Work W is done when a constant force F is applied to an object at a distance d

θ d F θ d d Only the force component acts in the same direction as the motion acting on the box. The vertical component just tries (unsuccessfully) to lift the object up. work = force along the distance × distance traveled work = force × distance traveled × cos the angle between them

4 units The SI unit of work is the newton meter and is called the joule, named after the 19th century physicist James Prescott Joule. 1 J (joule) = 1 n x 1 m Work is a scalar (adds as normal numbers)

Work – for example, studying hard, trying to lift a machine and exhaust yourself completely, holding a weight over your head for half an hour, is not worth mentioning in physics. By physics definition, you do no work if you just hold the weight above your head (no distance moved), you only do work when you lift the weight above your head (force in the direction of the distance moved)

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NO WORK If I carry a box across a room, I do no work on it because the force is not in the direction of motion (cos 900 = 0)

θ = 00 00< θ <900 θ = 900 900< θ <1800 θ = 1800 cos θ = 1 cos θ = + cos θ = 0 cos θ = – cos θ = –1 The work done by the force F is zero if : force applied but no motion involved: no distance moved, no work perpendicular to direction of motion (cos 900 = 0) d F F d F normal force tension motion in gravitational force string

The work done by the force F is: positive if the force and direction of motion are generally in the same direction 00< θ < 900 → cos θ = cos 00 = 1 W = Fd negative if the force and direction of motion are generally in the opposite direction 900< θ < → cos θ = – cos 1800 = –1 W = – Fd (work done by frictional force is always negative)

A) a book falls off a table b) a rocket speeds through space 2) Mike mows the lawn with a human-powered lawnmower. He pushes the mower with a force of 45 N directed at an angle of 41° below the horizontal. Calculate the work done by Mike on the mower while pushing it 9.1 m across the yard

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A) the book fell off the table Postive! Force (gravity) is in the same direction as motion. b) rockets accelerate Positive space! The force (the gas released by the rocket) is in the same direction as the motion.

11 We do: 2) Mike mows the lawn using a human-powered lawnmower. He pushes the mower with a force of 45 N directed at an angle of 41° below the horizontal. Calculate the work Mike does on the mower in pushing it 9.1 m across the yard F = 45 N d = 9.1 m θ = 410 d 410 F W = Fd cos θ = 310 J

A) A waiter carries one hand above his head at a constant speed, straight across the room. b) Friction slows down a rolling hockey puck 2) Forward force is 200 N. Frictional force is 200 N. Distance traveled is 200 km. Find (a) the work done by the forward force F on the car. (b) the work done on the car by the frictional force Ffr. (c) the net work done by the car.

A) The waiter carries a tray with food on his head with one hand across the room

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