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Chapter 9
Energy and Energy Resources
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Chapter 9
CRCT Preparation
1. The objects in the table are all on shelves in a
bookcase. Which of the objects is located on the
highest shelf?
A the book
B the plate
C the framed picture
D the statue
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Chapter 9
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1. The objects in the table are all on shelves in a
bookcase. Which of the objects is located on the
highest shelf?
A the book
B the plate
C the framed picture
D the statue
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Chapter 9
CRCT Preparation
2. Which of the following describes how energy is
converted when a cat knocks a plant off of a counter?
A The gravitational potential energy of the cat is
converted into kinetic energy.
B The kinetic energy of the cat is converted into
gravitational potential energy.
C The gravitational potential energy of the plant is
converted into kinetic energy.
D The kinetic energy of the plant is converted into
gravitational potential energy.
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Chapter 9
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2. Which of the following describes how energy is
converted when a cat knocks a plant off of a counter?
A The gravitational potential energy of the cat is
converted into kinetic energy.
B The kinetic energy of the cat is converted into
gravitational potential energy.
C The gravitational potential energy of the plant is
converted into kinetic energy.
D The kinetic energy of the plant is converted into
gravitational potential energy.
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3. Which of the following is true of a closed system?
A Energy can be destroyed, but cannot be created.
B Energy can be created, but cannot be destroyed.
C The total amount of energy in the system stays the
same.
D The system’s kinetic energy must equal its potential
energy.
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3. Which of the following is true of a closed system?
A Energy can be destroyed, but cannot be created.
B Energy can be created, but cannot be destroyed.
C The total amount of energy in the system stays the
same.
D The system’s kinetic energy must equal its potential
energy.
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Chapter 9
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4. Laboratory investigations show that when two cars
traveling at the same speed have a head-on collision,
the smaller car experiences more damage. Which of
the following is a reasonable explanation for that fact?
A The larger car has more potential energy than the
smaller car does.
B Mass has a greater effect on kinetic energy than
speed does.
C The larger car experiences more friction than the
smaller car does.
D The larger car has more kinetic energy than the
smaller car does.
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Chapter 9
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4. Laboratory investigations show that when two cars
traveling at the same speed have a head-on collision,
the smaller car experiences more damage. Which of
the following is a reasonable explanation for that fact?
A The larger car has more potential energy than the
smaller car does.
B Mass has a greater effect on kinetic energy than
speed does.
C The larger car experiences more friction than the
smaller car does.
D The larger car has more kinetic energy than the
smaller car does.
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Chapter 9
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5. What is the kinetic energy of a 30 kg greyhound
that is running at a speed of 17 m/s?
A 255 J
B 510 J
C 4,335 J
D 8,670 J
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Chapter 9
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5. What is the kinetic energy of a 30 kg greyhound
that is running at a speed of 17 m/s?
A 255 J
B 510 J
C 4,335 J
D 8,670 J
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Chapter 9
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6. Melissa made the sketches above to record
everyday examples of types of energy. Which sketch
shows kinetic energy?
A 1 only
B 2 only
C 3 only
D 1 and 2 only
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Chapter 9
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6. Melissa made the sketches above to record
everyday examples of types of energy. Which sketch
shows kinetic energy?
A 1 only
B 2 only
C 3 only
D 1 and 2 only
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Chapter 9
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7. Which of the following describes how energy is
converted when a toaster toasts bread?
A Electrical energy is converted into thermal energy.
B Thermal energy is converted into light energy.
C Light energy is converted into electrical energy.
D Electrical energy is converted into chemical energy.
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Chapter 9
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7. Which of the following describes how energy is
converted when a toaster toasts bread?
A Electrical energy is converted into thermal energy.
B Thermal energy is converted into light energy.
C Light energy is converted into electrical energy.
D Electrical energy is converted into chemical energy.
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8. Which situation describes a conversion from kinetic
energy into potential energy?
A An apple falls from a tree.
B A duck moves through the water.
C A rubber band is wrapped around stalks of broccoli.
D A can rolls along the floor.
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8. Which situation describes a conversion from kinetic
energy into potential energy?
A An apple falls from a tree.
B A duck moves through the water.
C A rubber band is wrapped around stalks of broccoli.
D A can rolls along the floor.
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9. Tyrone went camping at Fort Mountain State Park
in Chatsworth, Georgia. He got up early one morning
to bike the trails in the park. After a big breakfast,
Tyrone headed out on his bicycle ride. His bike’s
headlight was powered by his pedaling. Describe two
ways in which energy was converted from one form
into another.
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9. Answer - Full-credit answers should include two
energy conversions that would take place during the
operation of the bicycle. Answers may include:
• The chemical energy in Tyrone’s breakfast was
converted into kinetic energy as he pedaled the bike.
• The kinetic energy of the turning pedals was
converted into thermal energy as a result of friction
with the chain.
• The kinetic energy of the turning wheels was
converted into light energy as the headlight turned
on.
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10. Meredith fills a teapot with water and puts it on
the stove. She turns the gas burner on and waits for
the water to boil. When the water is boiling, Meredith
pours it into a cup with a teabag in it. She drinks the
tea after it has cooled slightly. Describe three transfers
of thermal energy in this example.
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10. Answers may include:
• Thermal energy that is converted from chemical
energy in the gas is transferred to the teapot.
• The thermal energy in the teapot is transferred to the
water particles in the teapot.
• Some of the thermal energy is transferred to the air
surrounding the teapot and the cup.
• Some of the thermal energy in the tea is transferred
to Meredith as she drinks the tea.
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