Acceleration and Free Fall Acceleration

In Newtonian physics, ________________ is any motion of a body where gravity is the only force acting upon it.

• kinematics

• free fall

• mechanics

• velocity

The standard acceleration due to gravity (or standard acceleration of free fall),is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as:

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

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Free fall takes into consideration the frictional force of air resistance.

• True

• False

If an object is in free fall for three seconds, how fast will it be falling?

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

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If an object is free falling onto the Moon, which of the following would be correct?

• It would accelerate at 9.8 m/s²

• It would not encounter any air resistance.

• It would not fall because the Moon has no gravity.

• It would impact the surface and bounce back into space.

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Heavier objects free fall faster than lighter objects.

• True

• False

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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.HS-PS2-1

A pumpkin is dropped from a 35 m building. What is its initial velocity (v_i)?

• 9.8 m/s²
• 35 m
• 0 m/s
• 9.8 m/s

If the mass on Mars is 6.4 kg x 10²³ kg and the mass on Earth is 6.0 kg x 10²⁴ kg, which one would you weigh more on?

• Earth
• Mars

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What does this graph represent?

• Constant Speed
• Acceleration
• Not moving