Lesson: Mechanical Power

In this lesson, we will learn how to calculate the power required for a force to do an amount of work on an object in an amount of time.

Sample Question Videos

02:42

Worksheet: 11 Questions • 1 Video

Q1:

Which of the following formulas correctly shows the relationship between the time taken to do an amount of work and the power supplied to do the work?

Q2:

A construction worker has to push a heavy, loaded waste container to a disposal area. This task tires the worker out and he pauses several times to rest. The distance that the container is moved in each 10-second time interval is shown in the table. Whenever the worker pushes the container, an average force of 80 N is used to push it. What is the average power supplied by the worker over the ten time intervals?

Time Interval Number	1	2	3	4	5	6	7	8	9	10
Distance (m)	2.3	1.1	0	1.6	0.7	0	0	1.2	1.1	0.5

Q3:

The power supplied by a force over a 10-second time interval is shown in the graph.

How much work does the force do from = 0 s to = 2 s?

How much work does the force do from = 3 s to = 5 s?

How much work does the force do from = 2 s to = 3 s?

How much work does the force do from = 5 s to = 9 s?

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