Chapter Nine, Lesson One: Work and Power

Question 1

work

Answer 1

In scientific terms, you do work any time you exert a force on an object that causes the object to move some distance.

Question 2

joule

Answer 2

When force is measured in newtons and distance in meters, the SI unit of work is the newton-meter (N⋅m). This unit is also called a joule in honor of James Prescot Joule, a physicist who studied work in the mid-1800s.

Question 3

power

Answer 3

Power is the rate at which work is done.

Question 4

watt

Answer 4

One joule of work done in one second is one watt of power.