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  • A man of mass 70 kg stands on a weighing scale in a lift which is moving (d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity ?

Q5.13  A man of mass 70 kg stands on a weighing scale in a lift which is moving

(d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity?

Answers (1)

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(d) If the lift falls freely then the acceleration of lift will be acceleration due to gravity.

Using Newton's law of motion we can write : 

                                           R\ -\ mg\ =\ ma

or                                        R\ -\ mg\ =\ m(-g)

or                                         R\ =\ m(-g)\ +\ mg\ =\ 0\ N

Thus the reading of weighing scale will also be zero since there is no normal force.

This state is called the state of weightlessness.

Posted by

Devendra Khairwa

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