Free Fall

What happens to the velocity of a ball as it is dropped off a cliff? 

• It decreases at a uniform rate 
• It increases at a uniform rate 
• It is constant 
• It increases at a non-uniform rate

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What is the velocity of a ball that has been dropped off a cliff after 1 , 2, 3, 4, and 5 seconds? (concept development page 4). 

• 10, 20, 30, 40, 50 m/s
• 5, 10, 15, 20, 25 m/s
• 5, 20, 45, 80,125 m
• 10,10,10,10,10 m/s

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NGSS.HS-PS2-4

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What is the distance a ball falls after 1,2,3,4,5 seconds?

• 10, 20, 30, 40, 50 m (meters)
• 5, 20, 45, 80,125 m (meters)
• 5, 10,15, 20, 25 m (meters)
• 10, 25, 60, 90,120 m (meters)

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NGSS.HS-PS2-4

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What is the acceleration of a ball that is dropped off the side of a cliff after 1,2,3,4,5 seconds?

• 5,10,15, 20, 25 m/s²
• 10, 20, 30, 40, 50 m/s²
• 5, 20, 45, 80, 125 m/s²
• 10,10,10,10,10 m/s²

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NGSS.HS-PS2-4

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In a normal environment, why does a bowling ball and feather hit the ground at different times when dropped from the same height?

• They don't; they hit the ground at the same time.
• One is more dense than the other.
• One is heavier than the other.
• Air resistance 

A ball is thrown in the air with an initial velocity of 40 m/s. How long does it take to reach back to the point it was thrown from?

• 4 seconds 
• 2 seconds 
• 6 seconds 
• 8 seconds 

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A ball is thrown up in the air with an initial velocity of 40 m/s. What is the ball's velocity after 6 seconds? 

• 20 m/s traveling upward.
• 10 m/s traveling downward.
• 20 m/s traveling downward. 
• 30 m/s traveling downward. 

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NGSS.MS-PS2-4

Which would fall with greater acceleration in a vacuum—a leaf or a stone?

• the leaf
• the stone
• They would accelerate at the same rate.
• It is difficult to determine without more information.

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If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by 

• about 5 m/s.
• about 10 m/s.
• about 15 m/s.
• a rate that depends on its initial speed.

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NGSS.MS-PS2-4

1.  An object free falls for 3.5 seconds. How far does it fall?

• 120.05 m
• 17.15 m
• 60.03 m
• 34.3 m

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