Energy and Energy Resources

1
Energy and Energy Resources
Chapter 9
Preview
CRCT Preparation
2
CRCT Preparation
Chapter 9
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
3
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
4
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.
5
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.
6
Chapter 9
CRCT Preparation
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 systems kinetic
energy must equal its potential energy.
7
Chapter 9
CRCT Preparation
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 systems kinetic
energy must equal its potential energy.
8
Chapter 9
CRCT Preparation
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.
9
Chapter 9
CRCT Preparation
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.
10
Chapter 9
CRCT Preparation
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
11
Chapter 9
CRCT Preparation
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
12
Chapter 9
CRCT Preparation
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
13
Chapter 9
CRCT Preparation
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
14
Chapter 9
CRCT Preparation
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.
15
Chapter 9
CRCT Preparation
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.
16
Chapter 9
CRCT Preparation
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.
17
Chapter 9
CRCT Preparation
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.
18
Chapter 9
CRCT Preparation
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 bikes headlight was powered by his
pedaling. Describe two ways in which energy was
converted from one form into another.
19
Chapter 9
CRCT Preparation
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 Tyrones
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.
20
Chapter 9
CRCT Preparation
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.
21
Chapter 9
CRCT Preparation
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.