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Matter in Motion

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Chapter 5

CRCT Preparation


Chapter 5 CRCT Preparation

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



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



2. What is the racing car’s acceleration?

A 0 m/s2

B 96 m/s2

C 192 m/s2

D 384 m/s2



2. What is the racing car’s acceleration?

A 0 m/s2

B 96 m/s2

C 192 m/s2

D 384 m/s2


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




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


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.




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.


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




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



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



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


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.


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.


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.


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.


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.




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.


Chapter 5

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.

CRCT Preparation


Chapter 5

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).

CRCT Preparation


Chapter 5

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?

CRCT Preparation


Chapter 5

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.

CRCT Preparation

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