Unit 3.5 Free Fall

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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Which one falls faster in vacuum? An elephant or a leaf?

• Elephant

• Leaf

• They are the same

• Nothing can be said

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If you drop a ball from the top of a building, how fast will it be moving after 6 seconds?

• 10 m/s
• 10 m/s/s
• 60 m/s
• 60 m/s/s

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

As a rock in FREE FALL falls through the air, acceleration

• stays constant

• decreases until it hits terminal velocity

• increases until it hits terminal velocity

• increases ~10 m/s each second

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Heavier objects free fall faster than lighter objects.

• True

• False

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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

A rock is dropped into a deep well and a splash is heard 3.00 seconds later.  (Assume it takes negligible time for the sound to travel up the well.) What is the velocity time graph for this scenario?

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On a planet that has no atmosphere, a rocket 14.2 m tall is resting on its launch pad. Freefall acceleration on the planet is - 4.45 m/s/s. A ball is dropped from the top of the rocket with zero initial velocity. What is the velocity time graph for this scenario?

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NGSS.HS-PS2-1

While skydiving, your parachute opens and you slow from 50.0m/s to 8.0m/s is a mere 0.80sec. What is the velocity time graph for this scenario?

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After landing safely from your skydiving experience you are so excited that you throw your helmet straight up.  It reaches a height of 5.0m above your hand. What is the velocity time graph for this scenario?

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NGSS.HS-PS2-1