Apparent weight of a man in a lift: How to use Newton's laws of motion (part 1)? #9
Channel: The Science Cube
Date: 2017-08-27

Does the apparent weight of a man in a lift change? Newtons laws of motion explain how weight gain or loss happens in a moving elevator. 
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If you stand on a weighing machine in an elevator accelerating upward, you feel more weight because the lift's floor presses harder on your feet, and the scale will show a higher reading than when the elevator is at rest. On the other hand, when the elevator accelerates downward, you feel lighter.

Key Moments-
00:00 Forces on a body in elevator
00:34 Forces at the bottom of elevator 
01:25 Equation for Newtons second law of motion
02:40 Elevator accelerating upwards
03:25 Equation F = ma for the body (apparent weight - accelerating elevator)
05:38 Elevator moving at a constant velocity
05:50 Newton's second law of motion equation at constant velocity
06:40 Velocity of elevator reducing and apparent weight
07:09 Equation of motion - elevator decelerating









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