FREE FALL MOTION

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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NGSS.HS-PS2-1

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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 

The change in velocity in a given time period is?

• Vi
• Vf
• a
• d

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NGSS.HS-PS2-1

When the velocity of an object does not change, what happens to its acceleration?

• Nothing, it does accelerate
• It is a constant acceleration
• It is a changing acceleration

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NGSS.HS-PS2-1

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

• the feather
• the metal bolt
• They would hit the ground at the same time.
• They would be suspended in a vacuum.

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NGSS.MS-PS2-2

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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NGSS.MS-PS2-2

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

• 9.8 m/s²
• 9.8 m/s
• 0 m/s²
• 0 m/s

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NGSS.MS-PS2-4

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be 

• less than the speed it had when thrown upwards.
• more than the speed it had when thrown upwards.
• the same as the speed it had when thrown upwards.

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A skydiver jumps out of a plane and is falling towards the Earth before she opens her parachute.

• She is in free fall because nothing is holding her up.

• She is in free fall because gravity is pulling her down.

• She is not in free fall because skydiving is an expensive hobby.

• She is not in free fall because gravity is not the only force she is experiencing.

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NGSS.MS-PS2-2

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The first space tourist sneaks his pet gerbil up onto the International Space Station and lets the little guy float around.

• The gerbil is in free fall because the only force acting on it is gravity.

• The gerbil is in free fall because it's floating around and not touching anything.

• The gerbil is not in free fall because it's in orbit and not falling towards the Earth.

• The gerbil is not in free fall because even though it's owner didn't pay it's way, space tourism is still an expensive hobby.

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NGSS.MS-PS2-2