Download Forms of Energy Web Practice

Forms of Energy Web Practice
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Which of the following types of energy comes from a compound that changes as its atoms are rearranged?
a. kinetic energy
c. thermal energy
b. chemical energy
d. light energy
____
2. Which of the following is due to the random motion of particles?
a. kinetic energy
c. thermal energy
b. nuclear energy
d. sound energy
____
3. Which of the following is the energy that comes from changes in an atom’s nucleus?
a. thermal energy
c. nuclear energy
b. light energy
d. chemical energy
____
4. What is a change from one form of energy to another called?
a. energy change
c. energy conversion
b. conversion of power
d. energy transfer
____
5. When you wind a rubber band on a toy airplane, which of the following types of energy does the rubber band
have?
a. kinetic energy
c. thermal energy
b. elastic potential energy
d. mechanical energy
____
6. In photosynthesis, which of the following types of energy is used to make new substances?
a. sound energy
c. thermal energy
b. light energy
d. nuclear energy
____
7. Your body uses the chemical energy in food to make which of the following types of energy?
a. kinetic energy
c. potential energy
b. light energy
d. sound energy
____
8. A hair dryer changes electrical energy into which of the following types of energy?
a. light energy
c. thermal energy
b. nuclear energy
d. chemical energy
____
9. Whenever one form of energy is converted into another form of energy, some of the original energy is always
converted into which of the following?
a. light energy
c. kinetic energy
b. thermal energy
d. sound energy
____ 10. Which of the following types of energy does a nuclear power plant generate to boil water?
a. thermal energy
c. light energy
b. sound energy
d. chemical energy
____ 11. When a bat hits a baseball, which of the following is transferred from the bat to the ball?
a. work
c. force
b. energy
d. electrical energy
____ 12. Which of the following is a conversion from light energy to chemical energy?
a. turning on a stove to heat dinner
c. growing an apple tree
b. turning on a lamp
d. making toast in a toaster
____ 13. After an energy conversion, you end up with the same total amount of energy as the original amount of
potential energy. Which of the following laws explains this rule?
a. law of energy changes
c. law of power and energy
b. law of conservation of energy
d. law of potential energy
____ 14. Which of the following is found when you compare the amount of energy before a conversion with the
amount of energy present after a conversion?
a. kinetic energy
c. energy efficiency
b. potential energy
d. energy source
____ 15. Which of the following converts mechanical energy into electrical energy?
a. nutcracker
c. electric generator
b. radiometer
d. light bulb
____ 16. You turn on a lamp and the light bulb becomes warm. Which of the following energy conversions causes this
heating of the light bulb?
a. thermal energy to electrical energy
c. electrical energy to thermal energy
b. light energy to thermal energy
d. electrical energy to light energy
Completion
Complete each statement.
17. What is the formula for efficiency?
Short Answer
18. Why does a stretched bow have potential energy?
19. Why is the law of conservation of energy considered a scientific law?
20. Why is a bike that creates less friction more efficient than a bike that creates more friction?
Matching
Match each item with the correct statement below.
a. law of conservation of energy
d. aerodynamic shape
b. closed system
e. friction
c. energy efficiency
____ 21. force that opposes motion between two surfaces that are touching
____ 22. rule that states that energy cannot be created or destroyed
____ 23. comparison of the amount of energy before and after a conversion
Essay
24. Why is it impossible to create a perpetual motion machine?
25. When you are hammering a nail, what is one type of energy conversion that is taking place?
26. How is water turned into electrical energy?
Problem
27. What is the efficiency of a bike that requires 150J of energy but gives you 125 joules?
Forms of Energy Web Practice
Answer Section
MULTIPLE CHOICE
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COMPLETION
17. ANS: efficiency = work output / work input
PTS: 1
SHORT ANSWER
18. ANS:
The bow has potential energy because work was done on it to change its shape.
PTS: 1
DIF: 2
REF: 1
19. ANS:
because there are no exceptions to the rule
OBJ: 2
PTS: 1
DIF: 2
REF: 3
OBJ: 2
20. ANS:
Friction creates thermal energy. This type of energy does not improve work output. Therefore the bike that
creates more friction creates more thermal energy so it has less energy for useful work (mechanical energy to
make the bike move).
PTS: 1
MATCHING
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ESSAY
24. ANS:
Answers may vary. Sample answers: Some wasted thermal energy always results from energy conversions.
The only way to keep a machine moving is to have a constant supply of energy.
PTS: 1
DIF: 2
REF: 3
OBJ: 4
25. ANS:
Answers may vary. Sample answer: mechanical energy to sound energy
PTS: 1
DIF: 2
REF: 2
OBJ: 2
26. ANS:
Answers may vary. Sample answer: Falling water turns a turbine in a dam. The turbines are connected to a
generator that changes mechanical energy into electrical energy.
PTS: 1
PROBLEM
27. ANS:
eff = wo / wi
eff = 125J / 150J
DIF: 1
REF: 4
OBJ: 1
eff = .83 = 83%
PTS: 1