# What do you know about energy?

1. Energy can be stored and become invisible.
True False

2. Energy involved in the interaction of an object and the earth is called kinetic energy.
True False

3. Because energy is conserved, as the amount of one type of energy in an object decreases, the amount of another type must increase.
True False

4. ________________ is the energy of motion.
(A)force energy
(B)chemical energy
(C)potential energy
(D)gravitational potential energy
(E)kinetic energy

5. Approximately how much gravitational potential energy does an 30kg dumbell have if it is held 3 meters in the air? (g = 10 m/sec2)
(A)90 kg (m/sec)2
(B)450 kg (m/sec)2
(C)900 kg (m/sec)2
(D)4500 kg (m/sec)2
(E)9000 kg (m/sec)2

6. Which of the following correctly defines kinetic energy?
(A)(mass) • (height) • (g)
(D)1/2 (mass) • (velocity)2
(E)kinetic energy cannot be accurately determined

7. Challenge Question: A 2 kg ball is dropped at rest from a height of 10 meters. Approximately how fast will the ball be moving when it hits the ground? (g = 10 m/sec2)
(A)20 m/sec
(B)10 m/sec
(C)5 m/sec
(D)1 m/sec
(E)cannot be determined from this information

8. Finished? Sneak a peak at the answers and see how you did!

Bang! Boing! Pop! Interactive Physics on the World Wide Web
Created for Thinkquest 96 by Josh Levine, Paulina Kuo, and Doug Brown