A person weighing 80N stands on a weighing machine in a lift. He finds the reading to be 1)120N, 2)60N, 3)80N and 4)zero. find the acceleration and the direction of motion in the lift in each case
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in the first case, since the weight is increasing, the lift is moving upwards
80N in kg= 8.16kg
W=m(g+a)
a=120/8.16-10
a=4.705 m/sec²
in the second case, since the weight is decreasing, the lift is moving downwards
W=m(g-a)
a=10-7.35=2.65m/sec²
in the third case, the lift is at rest
in the fourth case, the lift is freely falling down. the most unfortunate case!
80N in kg= 8.16kg
W=m(g+a)
a=120/8.16-10
a=4.705 m/sec²
in the second case, since the weight is decreasing, the lift is moving downwards
W=m(g-a)
a=10-7.35=2.65m/sec²
in the third case, the lift is at rest
in the fourth case, the lift is freely falling down. the most unfortunate case!
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