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.

Video

12:47

Sample Question Videos

03:42
02:25
01:45

Worksheet: 12 Questions • 4 Videos

Q1:

A train engine does work at a rate of 5,000 W. How much time will this engine take to do 125 J of work?

Q2:

A rocket moves vertically upward at a constant speed of 18 m/s. The weight of the rocket is 250 kN. What is the power supplied by the rocket’s engines? Give your answer in megawatts.

Q3:

A horse pulls a cart for 50 seconds. The work done by the force applied by the horse during this time is 37,500 J. What is the power supplied by the horse?

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