A boy is standing in a lift. When does the force on the floor of the lift due to the weight of the boy become zero?

When the lift moves up with an acceleration of

9.8 m s^{- 2}

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When the lift moves down with an acceleration of

9.8 m s^{- 2}

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When the lift moves down with a velocity of

9.8 m s^{- 1}

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When the lift does not move

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Solution

The correct option is B When the lift moves down with an acceleration of $9.8 m s^{- 2}$
When the lift moves down with an acceleration g $= 9.8 m s^{- 2}$ , the force applied by the boy on the lift becomes zero as the boy and the lift are falling with the gravitational acceleration. Neither the boy nor the lift apply force on each other.

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