Q 2.
A man of mass 70 kilogram stands on
weighing scale in a lift which is moving
upward with a uniform speed of 10
m/s. What would be the reading on the
scale in weighing machine?
Answers
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Mass of the man, m = 70 kg
Acceleration, a = 0
Using Newton’s second law of motion, we can write the equation of motion as:
R – mg = ma
Where, ma is the net force acting on the man.
As the lift is moving at a uniform speed, acceleration a = 0
∴ R = mg
= 70 × 10 = 700 N
∴ Reading on the weighing scale = 700 / g = 700 / 10 = 70 kg
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