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Work done, Energy and Power

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PA Physics Club

Physical Science    PA Physics Club  Name ________________________


POWER WORKSHEET

Read pages 150 - 155 to solve the following problems. 


1. What is the formula used to calculate power?
2. The metric unit for power is the
3. A horse performs 15000 joules of work pulling a wagon for 20 seconds. What is the horse's power?
4. A student who weighs 500 Newtons climbed the stairs from the first floor to the third floor, 15 meters above, in 20 seconds.
a. How much work did she do?
b. What was her power?
5. A box is pushed across the floor for a distance of 5 meters with a force of 50 Newtons in 5 seconds.
a. How much work is done?
b. What is the power?
6. If it takes 50 seconds to lift 10 Newtons of books to a height of 7 meters, calculate the power required.
7. The power rating of an electric lawn mower is 2000 watts. If the lawn mower is used for 120 seconds, how many joules of work can it do?
8. A 750 watt hairdryer is used for 60 seconds. How many joules of energy are used?
9. A 500 N passenger is inside a 24500 N elevator that rises 30 m in exactly 1 minute. How much power is needed for the elevator's trip?
10. Josh and Jake are both helping to build a brick wall which is 6 meters in height. They each lay 250 bricks, but Josh finishes this task in 3 hours while Jake requires 4.5 hours to complete his part. Who does more work, or do they both do the same amount? Who has more power? Explain


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