Physics: Acceleration and Freefall Quiz

which would hit the ground first if dropped from the same height in a vacuum, a feather or an elephant?

• the feather

• an elephant

• they would hit the ground at the same time

• they would be suspended in a vacuum

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NGSS.MS-PS2-4

if a baseball is thrown straight up, what is its velocity at the highest point?

• 9.8 m/s^2

• 9.8 m/s

• 0 m/s^2

• 0 m/s

which of the following statements applies to the motion of a ball tossed upward?

1. it has constant acceleration on the way up.

2. it has constant acceleration at the top of its path.

3. it has constant acceleration as it moves downward.

• 1 only

• 1 and 3

• 3 only

• all are correct

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NGSS.HS-PS2-1

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds
• 35 seconds
• 0.3 seconds
• 3.3 seconds

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NGSS.HS-PS2-1

A ball of clay is thrown at a wall at a velocity of 28.0 m/s. After it hits the wall, it takes 0.020 s to stop. What is the acceleration of the clay when it hits the wall? Caution:   $V_f$  is the point where the clay ball hits the wall, 0 m/s.

• 1400 m/s²

• -1400 m/s₂

• 0.56 m/s²

• -0.56 m/s²

Tags

NGSS.HS-PS2-1

The SI unit for acceleration is

• mph

• ft/sec

• m/s²

• m/s

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NGSS.HS-PS2-1

If you throw a ball straight up, what is its velocity at the highest point?

• 9.81 m/s²

• 0.0 m/s²

• 9.81 m/s

• 0.0 m/s

Which graph represents the greatest acceleration?

• A
• B
• C
• D

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NGSS.HS-PS2-1

Which graph represents zero acceleration (constant velocity)?

• A
• B
• C
• D

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NGSS.HS-PS2-1

Which graph demonstrates the greatest positive speed?

• A
• B
• C
• D