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Question
The force exerted by the floor of a lift on the foot of a boy, who is standing on it, is more than the actual weight of the boy, if the lift is moving :
The force exerted by the floor of a lift on the foot of a boy, who is standing on it, is more than the actual weight of the boy, if the lift is moving :
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Solution
The correct options are
A down and speed is decreasing
B up and speed is increasing
Answer is B and D.
If the lift is moving upwards, the net force will be the sum of weight of boy and inertial force. Hence, net force will be more. Further, when the lift is moving downwards with decreasing speed, the negative acceleration will add to weight of the boy. Hence, net force will be more.
A down and speed is decreasing
B up and speed is increasing
Answer is B and D.
If the lift is moving upwards, the net force will be the sum of weight of boy and inertial force.
Hence, net force will be more. Further, when the lift is moving downwards with decreasing speed, the negative acceleration will add to weight of the boy. Hence, net force will be more.
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