Download Energy Web Practice

Energy Web Practice
Completion
Complete each statement.
Use the terms from the following list to complete the sentences below.
potential energy
fission
potential energy
gravitational potential energy
gravitational potential
energy
fission
1. The energy an object has because of its position is called ____________________.
Short Answer
2. Where does the sun get its energy to light and heat Earth?
3. Why does a stretched bow have potential energy?
4. What two measurements do you multiply together to find gravitational potential energy?
5. How is electrical energy produced at a nuclear power plant?
6. What is the gravitational potential energy of a book that weighs 15 N at a height of 2.5 m off the
ground?
7. Demonstrate the conversion of potential energy to kinetic energy by using a pendulum model.
Use the image below to answer the following questions.
8. At which point(s) does the pendulum have the most potential energy?
9. At which point(s) does the pendulum have the most kinetic energy?
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
____
10. force that opposes motion between two surfaces that are touching
____
11. rule that states that energy cannot be created or destroyed
____
12. group of objects that transfer energy only to each other
____
13. comparison of the amount of energy before and after a conversion
Match each item with the correct statement below.
a. gravitational potential energy
f. sound energy
b. energy
g. mechanical energy
c. light energy
h. thermal energy
d. kinetic energy
i. electrical energy
e. potential energy
____
14. the ability to do work
____
15. the energy an object has because of its position
____
16. all of the kinetic energy due to the random motion of the particles that make up an object
Essay
17. Mrs. Kent is placing boxes of books on some shelves. When she needs to place the same boxes on
a higher shelf, how is the gravitational potential energy of the boxes affected?
18. Why is it impossible to create a perpetual motion machine?
19. Explain how the energy from a wood fire actually comes from the sun.
20. When a musician pulls the strings of a guitar, what happens to make the sound reach your ear?
Energy Web Practice
Answer Section
COMPLETION
1. ANS: potential energy
PTS:
1
DIF:
1
REF: 1
OBJ: 2
SHORT ANSWER
2. ANS:
Answers may vary. Sample answer: A reaction called fusion occurs and gives off a large amount
of energy. The sun’s light and heat come from the energy of this reaction.
PTS: 1
DIF: 2
REF: 1
OBJ: 2
3. ANS:
The bow has potential energy because work was done on it to change its shape.
PTS: 1
4. ANS:
weight and height
DIF:
2
REF: 1
OBJ: 2
PTS: 1
DIF: 1
REF: 1
OBJ: 2
5. ANS:
Answers may vary. Sample answer: The nuclear plants generate thermal energy that boils water to
produce steam. The steam turns a turbine, which rotates a generator. The generator spins to convert
kinetic energy to electrical energy.
PTS: 1
6. ANS:
37.5 J
DIF:
2
REF: 4
OBJ: 3
PTS: 1
DIF: 3
REF: 1
OBJ: 2
7. ANS:
As the pendulum is lifted upward, it gains potential energy. When the pendulum is released and
swings downward, that potential energy is converted to kinetic energy.
PTS: 1
DIF: 1
REF: 2
OBJ: 2
8. ANS:
The pendulum has maximum potential energy at points A and E.
PTS:
1
DIF:
2
REF: 3
OBJ: 1
9. ANS:
The pendulum has maximum kinetic energy at point C.
PTS:
1
DIF:
2
REF: 3
OBJ: 1
10. ANS:
OBJ:
11. ANS:
OBJ:
12. ANS:
OBJ:
13. ANS:
OBJ:
E
1
A
2
B
1
C
3
PTS:
1
DIF:
1
REF: 3
PTS:
1
DIF:
1
REF: 3
PTS:
1
DIF:
1
REF: 3
PTS:
1
DIF:
1
REF: 3
14. ANS:
OBJ:
15. ANS:
OBJ:
16. ANS:
OBJ:
B
1
E
2
H
3
PTS:
1
DIF:
1
REF: 1
PTS:
1
DIF:
1
REF: 1
PTS:
1
DIF:
1
REF: 1
MATCHING
ESSAY
17. ANS:
Answers may vary. Sample answer: The gravitational potential energy of the boxes will increase
because she needs to raise the boxes to a higher shelf.
PTS: 1
DIF: 2
REF: 4
OBJ: 2
18. 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
19. ANS:
Answers may vary. Sample answer: Photosynthesis uses light energy from the sun to make the
tree. The chemical energy from a tree can be converted to thermal energy when you burn the tree’s
wood.
PTS: 1
20. ANS:
DIF:
2
REF: 2
OBJ: 2
Answers may vary. Sample answer: When the strings are stretched, they store potential energy.
When the strings are released, the potential energy is converted to kinetic energy, which makes the
strings vibrate. The strings transmit some of the kinetic energy to the air, which also vibrates. This
energy is transmitted to your ear.
PTS:
1
DIF:
3
REF: 1