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Question
If a stone and a pencil are dropped simultaneously in vacuum from the top of a tower, which of the two will reach the ground first? Give reason.
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Solution
- When a body is present in vacuum, no frictional force or buoyancy or air resistance force acts on the body. Only the force of gravity acts on the body, therefore the acceleration of the body is “g”.
- In this case, when a stone and pencil are dropped simultaneously in vacuum from the top of a tower, the acceleration of both stone and pencil is “g”.
Thus, their time of reaching the ground is independent of their masses since both have equal acceleration and hence both of them reach the ground at the same moment.
- When a body is present in vacuum, no frictional force or buoyancy or air resistance force acts on the body. Only the force of gravity acts on the body, therefore the acceleration of the body is “g”.
- In this case, when a stone and pencil are dropped simultaneously in vacuum from the top of a tower, the acceleration of both stone and pencil is “g”.
Thus, their time of reaching the ground is independent of their masses since both have equal acceleration and hence both of them reach the ground at the same moment.
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