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Question

Identify the free fall situations from the following.

A
A man landing through a parachute
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B
An apple falling on moon
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C
A rocket propelling into space
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D
A heavy stone falling from a cliff
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Solution

The correct options are
B An apple falling on moon
D A heavy stone falling from a cliff
During free fall, gravitation is the only force that should act on the body.
  • A dense stone falling from a cliff is in free fall under the gravitational force of the Earth. This is valid, because the air resistance is negligible against a dense heavy stone.
  • An apple falling on the Moon is under free fall due to the gravitational force of the Moon, and the lack of atmosphere on the Moon to create air resistance.
  • A parachute experiences drag force (resistance of air) and thus, another force except gravity acts on it. Hence, it is not under free fall.
  • An upward force acts on a rocket during its flight because of the gases it eject. Hence, it is at all free fall.

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