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From an inertial frame of reference, explain the apparent weight for a person standing in a lift having zero acceleration. |
Answer» 1. A passenger inside a lift experiences only two forces:
2. As these forces are oppositely directed, the net force in the downward direction will be F = ma – N. 3. Though the weight of a passenger is the gravitational force acting upon it, the person experiences his weight only due to the normal reaction force N exerted by the floor. 4. A lift has zero acceleration when the lift is at rest or is moving upwards or downwards with constant velocity. 5. Thus, a net force acting on the passenger inside the lift will be, F = 0 = mg – N ∴ mg = N Hence, in this case the passenger feels his normal weight mg. |
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