7th Grade Science Energy Quiz:
PE = Weight x Height
PE = Mass x Gravity x Height
KE = (Mass x Velocity2)/2 or ½(MV2)
1.
Using the picture on the left, at which point will
the ball have the most Potential Energy?
1
2
3
4
2.
Using the picture on the left at which point will
the ball have the most Kinetic Energy?
1
3. The law of conservation of energy states…
a. Energy is destroyed
b. Energy is changed
c. Energy is created
4. The energy associated with motion is called
a. Kinetic energy
b. Elastic potential energy
c. Gravitational potential energy
d. Nuclear energy
5. Unlike kinetic energy, potential energy is
a. Energy of motion
b. Stored
c. Conserved
d. Not measurable
6. What is the formula for Potential Energy?
a. (Mass x Velocity2)/2
b. Mass / Velocity
c. Weight x Height
d. Weight / Height
7. What is the formula for Kinetic Energy?
a. (Mass x Velocity2)/2
b. Mass / Velocity
c. Weight x Height
d. Weight / Height
2
3
4
8. If a Skydiver weights 210 N and jumps out of an airplane at 5000 meters high how much
potential energy do they have?
a. 1,050,000 J
b. 23.8 J
c. 5210 J
d. 2,625,000,000 J
9. If the same skydiver has a mass of 21 kg and travels at 54m/s what is their kinetic energy?
a. 1134 J
b. 2.5 J
c. 30,618 J
d. 11,907 J
10. If an orange has 2 J of potential energy and it is hanging 4 meters high in a tree how much does
it weigh?
a. 8N
b. 0.5N
c. 2N
d. 6N
11. If a car has a velocity of 10 m/s and a kinetic energy of 100000 J what is the car’s mass?
a. 10,000 kg
b. 20,000 kg
c. 2,000 kg
d. 0.001 kg
12. Which variable affects potential energy more?
a. Weight
b. Height
c. Both the same amount
d. Neither affect potential energy
13. Which will increase kinetic energy the greatest amount?
a. Increase Mass
b. Increase Velocity
c. Increase both Mass and Velocity
d. Increase Mass and Decrease Velocity
14. If a coconut has 100 J of energy at the top of a tree with a weight of 10 N and a height of 10 m
what is the total energy when the coconut falls halfway down the tree?
a. 0.01J
b. 1J
c. 100J
d. 1000J
15. What is the best analysis for the graph?
a. Height and Potential Energy are both variables
b. As Height increases potential energy increases
c. As height increases potential energy decreases
d. Height does not affect potential energy
16. According to the graphs above which affects kinetic energy more mass or velocity?
a. Mass affects kinetic energy more
b. Velocity affects kinetic energy more
c. They both affect kinetic energy the same amount
d. They don’t affect kinetic energy