Power Notes

• Power is the rate at which work is done or how much work is done in a certain
amount of time.

• Power is measured in watts.
power = work
time

p = w / t

POWER

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Practice Power Problems

1. While rowing in a race, John does 3960 J of work on the oars in 60.0 s. What is his power output in watts?

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Practice Power Problems

2. Using a jack, a mechanic does 5350 J of work to lift a car .500 m in 50.0 seconds. What is the
mechanic’s power output?

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Practice Power Problems

3. Anna walks up the stairs on her way to class. She weighs
565 N and the stairs go up
3.25 m vertically. What is her
power output if she climbs the stairs in 12.6 s?

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