Physics

Question 1

1Work and energy have the same unit.

Easy

A. True B. False

Question 2

2Find the potential energy gained when a 20 kg mass is raised through 2 m. (g = 10 m/s²)

Easy

A. 400 J B. 40 J C. 200 J D. 202 J

Question 3

3A force of 100 N moves a box 2 m in its own direction. The work done is ___ J.

Easy

Your answer (fill in the blank)

Question 4

4Work is done when

Easy

A. no force acts B. a force moves its point of application in the direction of the force C. a force acts on a stationary wall D. a body is at rest

Question 5

5Power is the

Easy

A. rate of doing work B. force applied C. total work done D. energy stored

Question 6

6Power = force × velocity.

Medium

A. True B. False

Question 7

7A force of 20 N moves a box 10 m in its own direction. The work done is ___ J.

Easy

Your answer (fill in the blank)

Question 8

8A force of 20 N moves a box 3 m in its own direction. The work done is ___ J.

Easy

Your answer (fill in the blank)

Question 9

9Find the potential energy gained when a 50 kg mass is raised through 5 m. (g = 10 m/s²)

Easy

A. 1,250 J B. 250 J C. 505 J D. 2,500 J

Question 10

10The kilowatt-hour is a unit of

Easy

A. energy B. power C. current D. force