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Energy Quiz Review
Answer Key
Energy Quiz Monday 12/2/13
1. What is energy? The ability to do work.
2. What’s the difference between potential and kinetic energy? Potential energy is the energy of position and
kinetic energy is the energy of motion.
3. While throwing a ball in the air, when is potential energy greatest? Why? Potential energy is greatest when the
ball reaches its highest point because that’s when it has the greatest potential to fall and the greatest
gravitational force acting on it (GPE = weight X height).
4. When is kinetic energy greatest? Why? Kinetic energy is greatest when the ball is first thrown upward because
that’s when the ball has the greatest speed. As the ball continues to move upward it slows down and kinetic
energy changes to potential energy.
5. What’s the formula for kinetic energy? ke = mv2/2
6. Mechanical energy is total kinetic energy plus total potential energy.
7. Name 2 ways to increase gravitational potential energy. Increase weight or increase height
8. Give an example of elastic potential energy. Stretching a rubber band
9. Briefly define each type of energy.
a. Sound energy is caused by an object’s vibrations
b. Nuclear energy is the energy that comes from changes in the nucleus of an atom
c. Electrical energy is the energy of moving electrons
d. Chemical energy is the energy of a compound that changes as its atoms are rearranged
e. Light energy is produced by the vibrations of electrically charged particles
Thermal energy is all of the kinetic energy due to random motion of the particles that make up an object
10. Give an example of electrical energy converting to thermal energy. Hairdryer, toaster, curling iron
11. Give an example of light energy converting to chemical energy. Photosynthesis
12. During an energy conversion, some energy is always converted into thermal energy.
13. Why is #18 true? Because friction is always present during energy conversions and friction generates thermal
14. What does the Law of Conservation of Energy state? Energy cannot be created or destroyed.
15. How are renewable and nonrenewable resources different? Nonrenewable resources cannot be replaced or are
replaced much more slowly than they are used and renewable resources are naturally replaced more quickly
than they are used.
16. Name 2 renewable resources. Solar, wind, water, geothermal, biomass
17. Name 2 nonrenewable resources. Fossil fuels (coal, oil, natural gas), nuclear