Multiple Choice Online Test
Indicate the correct answer by clicking on the button next to the numbers 1, 2, 3 or 4. There is only one correct answer per question. After you have answered all multiple choice questions compare your choices with the correct answers.

Energy, Work & Power

1.) An object moving in a straight line with a constant velocity has kinetic energy E and momentum p. If the speed of the object is doubled, the new value of kinetic energy and momentum will be …

Kinetic Energy

Momentum

1

2 E

2 p

2

2 E

4 p

3

4 E

p

4

4 E

2 p

2.) A ball is projected vertically upwards and then returns to the ground. Ignore all frictional forces. Which one of the following statements about the kinetic energy and potential energy of the ball is true?

1 | The kinetic energy is always equal to the potential energy.
2 | The kinetic energy is always less than the potential energy.
3 | The kinetic energy is always more than the potential energy.
4 | The sum of the kinetic energy and potential energy is always constant.

3.) An object is dropped from the top of a high building and falls freely to the ground. Which one of the graphs below best represents its potential energy (Ep) as a function of the distance fallen by the object?

1

A

2

B

3

C

4

D

4.) A large and a small sphere are released at the same time from the same height above the ground. Which one of the following quantities associated with the spheres will be the same for both after 1 second, if frictional effects are ignored?

1 | speed
2 | momentum
3 | potential energy
4 | kinetic energy

5.) Which one of the following expressions has the same units as power?

1 | force x distance
2 | work x time
3 | force x acceleration
4 | force x velocity

6.) A person lifts a heavy load to a vertical height of 2,0 m in 3 seconds. If he/she had done this more slowly in 6 seconds, the work on the load would have been:

1 | twice as great
2 | four times as great
3 | the same
4 | half as great

7.) At what height above the ground must a mass of 10 kg be to have a potential energy equal in value to the kinetic energy possessed by a mass of 10 kg moving with a velocity of 20 m/s?

1 | 10 m
2 | 20 m
3 | 50 m
4 | 100 m

8.) A girl runs up one flight of steps. Which one of the following factors does not affect the work done by the girl against gravity?

1 | mass of the girl
2 | height of the steps
3 | speed of the girl
4 | acceleration due to gravity

9.) A girl weighing 400 N runs up the a flight of stairs (height 5 m) in a time of 4 seconds. Her rate of working against gravity is ...

1 | 320 W
2 | 400 W
3 | 500 W
4 | 2000 W

10.) A stone dropped from the top of a 80m high building strikes the ground at 40 m/s after falling for 4 seconds. The stone's potential energy with respect to the ground is equal to its kinetic energy …

1 | at the moment of impact.
2 | 2 seconds after the stone is released.
3 | after the stone has fallen 40 m.
4 | when the stone is moving at 20 m/s.

Results

Hint: You can do the test offline as well. Just click "file" from the menu, then "save" to a destination of your choice. But remember to open file either with windows explorer or internet explorer. Netscape might not be able to reload pictures offline.

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