Free Fall Calculations

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

when would the ball reach a velocity of 0 m/s?

• at the top

• at the bottom

• in the middle

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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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NGSS.MS-PS2-4

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 

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

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Two rocks with different size and mass are dropped from the same height. Which of the rock will reach the ground first?

• greater rock

• smaller rock

• both reach the ground at the same time

Tags

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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NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Which one of the following statements about this rock while it is in the air is correct?

• On the way up, its velocity is upward, and at the highest point its velocity is zero.

• On the way down, its velocity is downward, and at the highest point its acceleration is zero.

• Throughout the motion, the velocity is always in the same direction as the acceleration.

• The acceleration is downward at all point in the motion except that is zero at the highest point.

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NGSS.MS-PS2-4

If an object is in free fall for three seconds, how fast will it be falling at the end of its motion?

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

Tags

NGSS.MS-PS2-4

How long did it take this object to travel back to its reference/starting point?

• 20 s

• 30 s

• 60 s

• 100 s

What is the acceleration due to gravity on Earth that affects objects in free fall?

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NGSS.MS-PS2-4

NGSS.MS-PS2-5