Physics of Free Fall and Motion

A ball is dropped from a height of 20 meters. What is the acceleration of the ball during its free fall? (Assume no air resistance)

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NGSS.HS-PS2-1

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NGSS.HS-PS3-2

What is the net force acting on a ball at the highest point of its vertical throw?

• Equal to its weight

• Greater than its weight

• Less than its weight

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

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NGSS.HS-PS2-4

Which of the following statements is true about energy conservation in free fall?

• Potential energy is converted to kinetic energy

• Kinetic energy is converted to potential energy

• Total energy increases

• Total energy decreases

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NGSS.HS-PS2-4

A projectile is launched horizontally from a height. Which of the following is true about its energy conservation?

• Only kinetic energy is conserved

• Only potential energy is conserved

• Total mechanical energy is conserved

• Energy is lost due to air resistance

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NGSS.HS-PS3-1

Starting from rest, object 1 falls freely for 4.0 seconds, and object 2 falls freely for twice as long. Compared to object 1, object 2's height is:

• half as far.

• twice as far.

• three times as far.

• four times as far.

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NGSS.HS-PS2-4

At what point is v_y= 0 m/s?

• A

• B

• C

• D

• None of these points