Chapter 5
Matter in Motion
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Chapter 5
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1. During a field experiment about speed, a scientist
created the chart. The chart shows distance and time
measurements for a racing car on the straight section
of a race track. What is the racing car’s speed?
A 0 m/s
B 96 m/s
C 192 m/s
D 384 m/s
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Chapter 5
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1. During a field experiment about speed, a scientist
created the chart. The chart shows distance and time
measurements for a racing car on the straight section
of a race track. What is the racing car’s speed?
A 0 m/s
B 96 m/s
C 192 m/s
D 384 m/s
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Chapter 5
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2. What is the racing car’s acceleration?
A 0 m/s2
B 96 m/s2
C 192 m/s2
D 384 m/s2
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2. What is the racing car’s acceleration?
A 0 m/s2
B 96 m/s2
C 192 m/s2
D 384 m/s2
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Chapter 5
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3. Theodore plots the data in the chart. He plots
distance on the y-axis and time on the x-axis. How will
the movement of the racing car be represented on the
graph?
A a curved line
B a straight line
C a series of connected straight lines
D a single point
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Chapter 5
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3. Theodore plots the data in the chart. He plots
distance on the y-axis and time on the x-axis. How will
the movement of the racing car be represented on the
graph?
A a curved line
B a straight line
C a series of connected straight lines
D a single point
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Chapter 5
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4. A downhill skier has her skis sharpened and waxed
before every race. What effect would this have on her
performance?
A The force of friction between the skis and snow
would increase, and her speed would decrease.
B The force of friction between the skis and snow
would decrease, and her speed would decrease.
C The force of friction between the skis and snow
would increase, and her speed would increase.
D The force of friction between the skis and snow
would decrease, and her speed would increase.
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Chapter 5
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4. A downhill skier has her skis sharpened and waxed
before every race. What effect would this have on her
performance?
A The force of friction between the skis and snow
would increase, and her speed would decrease.
B The force of friction between the skis and snow
would decrease, and her speed would decrease.
C The force of friction between the skis and snow
would increase, and her speed would increase.
D The force of friction between the skis and snow
would decrease, and her speed would increase.
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Chapter 5
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5. What is the average speed of the toy car if it moves
through the distance shown in 2 s?
A 2.0 cm/s
B 2.0 cm/s2
C 1.5 cm/s
D 1.5 cm/s2
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5. What is the average speed of the toy car if it moves
through the distance shown in 2 s?
A 2.0 cm/s
B 2.0 cm/s2
C 1.5 cm/s
D 1.5 cm/s2
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6. Which of the following pairs of forces is balanced?
A 16 N north and 16 N south
B 16 N north and 16 N east
C 16 N north and 16 N west
D 16 N north and 16 N north
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6. Which of the following pairs of forces is balanced?
A 16 N north and 16 N south
B 16 N north and 16 N east
C 16 N north and 16 N west
D 16 N north and 16 N north
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7. The graph describes the motion of 2 balls—ball A and ball B.
According to the graph, which of the following statements is
true?
A The velocity of ball A is increasing
over time at a constant acceleration.
B The velocity of ball B is increasing
over time at a constant acceleration.
C The velocity of ball A is decreasing
over time at a constant acceleration.
D The velocity of ball B is decreasing
over time at a constant acceleration.
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7. The graph describes the motion of 2 balls—ball A and ball B.
According to the graph, which of the following statements is
true?
A The velocity of ball A is increasing
over time at a constant acceleration.
B The velocity of ball B is increasing
over time at a constant acceleration.
C The velocity of ball A is decreasing
over time at a constant acceleration.
D The velocity of ball B is decreasing
over time at a constant acceleration.
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8. According to the data in the graph, which of the
following conclusions about ball B is valid?
A The ball is moving, but not
accelerating.
B The ball’s acceleration is
positive and is not constant.
C The ball’s acceleration is
negative and is not
constant.
D The ball is moving with
constant deceleration.
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8. According to the data in the graph, which of the
following conclusions about ball B is valid?
A The ball is moving, but not
accelerating.
B The ball’s acceleration is
positive and is not constant.
C The ball’s acceleration is
negative and is not
constant.
D The ball is moving with
constant deceleration.
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9. How will the motion of a ball rolling on the
ground change if the ball encounters a frictional
force that opposes its motion?
A The ball will speed up.
B The ball will slow down.
C The ball’s speed will not change.
D The ball will change direction.
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9. How will the motion of a ball rolling on the
ground change if the ball encounters a frictional
force that opposes its motion?
A The ball will speed up.
B The ball will slow down.
C The ball’s speed will not change.
D The ball will change direction.
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10. Because most objects do not travel at a constant
speed, average speed is often used to calculate
speed. Yesterday, Juanita traveled 30 km. She drove
16 km in 20 min, walked 4 km in 1 h, then rode a bus
that traveled 10 km in 10 min. Calculate her average
speed in kilometers per hour. Show your work.
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10. Answer - Full credit answers should include the
following points:
• Juanita’s average speed is 20 km/h.
• The total distance traveled is 30 km; the total time is
90 min (20 min 1 60 min 1 10 min), or 1.5 h.
• Dividing the total distance by the total time (30 km 4
1.5 h), gives the average speed (20 km/h).
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11. You observe the effects of gravity every day. What
two quantities does gravitational force depend on? How
do those quantities affect the size of the gravitational
force between two objects?
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11. Answer - Full credit answers should include the
following points:
• Gravitational force depends on the mass of objects
and the distance between those objects.
• Gravitational force increases as the mass of one or
both of the objects increases.
• Gravitational force decreases as the distance between
the objects increases.
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