First slide

Newton's laws of motion

Question

A 60-kg man stands on a spring scale in a lift. At some instant, he finds that the scale reading has changed from 60 kg to 50 kg for a while and then comes back to original
mark. What should be concluded?

Moderate

A

The lift was in constant motion upward.
B

The lift was in constant motion downward.
C

The lift while in motion downward suddenly stopped.
D

The lift while in motion upward suddenly stopped.

Solution

The reading of the spring scale is the normal reaction between man and spring scale (see figure As the reading is decreases, it means normal reaction is decreasing. Firstly, the lift must be moving upwards with constant velocity and decelerated to rest.

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