Georgia Science Grade 8

Chapter 10: Motion and Momentum

CRCT Practice

1
An acorn falls from the top of an oak tree and accelerates at 9.8 m/s2. It hits the ground in 1.5 s. What is the speed of the acorn as it hits the ground?
A)9.8 m/s
B)11.3 m/s
C)14.7 m/s
D)0.15 m/s
2
Over which time period is the ball's average speed the fastest?

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A)between 0 and 1 s
B)between 1 and 2 s
C)between 2 and 3 s
D)between 3 and 4 s
3
What is the average speed of the ball over the time period 0 s to 4 s?

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A)0.8 m/s
B)1.0 m/s
C)10 m/s
D)0.7 m/s
4
What is the acceleration between 0 s and 2 s?

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A)10 m/s2
B)5 m/s2
C)0 m/s2
D)–5 m/s2
5
Over what time period is the speed of the car constant?

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A)between 1 s and 2 s
B)between 2 s and 3 s
C)between 4 s and 5 s
D)between 5 s and 6 s
6
What is the acceleration over the time interval 2 s to 4 s?

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A)10 m/s2
B)5 m/s2
C)2 m/s2
D)0 m/s2
7
Sound travels at a speed of 340 m/s. How long does it take for the sound of thunder to travel 1,530 m?
A)1190 s
B)4.5 s
C)1,870 s
D)0.22 s
8
Which can occur when an object is accelerating?
A)It speeds up.
B)It slows down.
C)It changes direction
D)all of the above
9
When the bowling ball hits the pins, which of the following is NOT true?

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A)The momentum of the bowling ball decreases.
B)The momentum of the pins increases.
C)Momentum is transferred from the pins to the bowling ball.
D)The total momentum of the bowling ball and the pins does not change.
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