Lesson: Mechanical Power Physics • 9th Grade

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.

Lesson Plan

Students will be able to

use the formula work done = power time in all combinations.

Lesson Video

Lesson Playlist

03:42
01:45
+1

02:25

Lesson Worksheet

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?