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Question

A man weighs 80kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s2. What would be the reading on the scale?


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Solution

Step 1: Given

Mass of the man: m=80kg

Acceleration of the lift: a=5m/s2

Acceleration due to gravity: g=10m/s2

Step 2: Formula used

Normal force acting on man will be N=mg+a.

Step 3: Reading on weighing scale

Substitute the values in the formula.

N=mg+a=8010+5=80×15=1200N

Hence, the reading on the scale will be 1200 N.


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