To validate Newton's laws in non-inertial frame of reference, we have to apply a force mass times the acceleration and in opposite direction of the acceleration of the frame.
When a lift is going upward, the pseudo force will be downward and when lift is going down, the pseudo force will be upward and accordingly weight of a man standing on a weighing machine in the lift will change.
When a lift is going upward, the pseudo force will be downward and when lift is going down, the pseudo force will be upward and accordingly weight of a man standing on a weighing machine in the lift will change.
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