Name __________________________ Date ___________Line ________ The science definition of work is very different from our normal definition of work. Two.

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Name __________________________ Date ___________Line ________ The science definition of work is very different from our normal definition of work. Two things must be true in order for work to be done A person is pushing on a wall. He is sweating hard and considers it hard work, but why is this NOT WORK?? ___________________________________ A person carrying a stack of books while walking. She is huffing and puffing and considers it hard work, but why is this NOT WORK?? ___________________________________

Let’s calculate work! Your work formula: You push a refrigerator with a force of 100N. If you move the refrigerator a distance of 5m how much work is done? Let’s calculate power! You lift a crying baby from a crib with 50 J of work. It takes you 5 seconds. How much power is needed? COMBINE BOTH FORMULAS: A person pushes a couch with 100 N of force. It moves 5 meters and it takes him 2 seconds to do this. What was his power?

Name __________________________________________ Date __________ A lawn mower is pushed with a force 1000 N. If 5000 J of work is done in mowing a lawn, what is the distance the lawn mower was pushed? The brakes on a bike do 2000 J of work in stopping the car. If the car travels a distance of 100 m while the brakes are being applied, what is he force the brakes exert on the bike? You push a box with a force of 20 N. It doesn’t move. What is the work done? A light bulb converts electrical energy into light and heat at a rate of 75 J every second. How many watts is the light bulb?

If a runner’s power is 80 W, what is the work done by the runner in 5 seconds? How long will it take a car motor to do 5000 J of work if it uses 50 W of power? You lift a stack of books and do 200 J of work in 5 seconds. What is the power? You toss a baseball in the air and use 50 W of power in 2 seconds. What is the work done?

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