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You find your mass to be 42 kg on a weig...

You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 Kg?

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In fact, a weighing machine is a sort of spring balance which measures the weight (and not the mass) of a body. When we stand on the weighing machine, our weight (which is due to gravitational attraction of the earth) acts vertically downwards. But the buoyancy due to air on our body acts vertically upwards. As a result of this, our apparent weight (true weight-buoyant force) is less than the true weight. Since the weighing machine measures the apparent weight, our true weight is more, i.e. , more than 42 kg.
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You find your mass to be 42 kg on a weighing machine. If your mass more or less than 42 Kg?

You find your mass to be 42 kg on a weighing machine. In your mass more or less than 42kg?

Knowledge Check

  • In fig., a man true mass M is standing on a weighing machine placed in a cabin. The cabin is joined by a string a body of mass m. Assuming no friction, and negligible mass of cabin and weighing machine, the measured mass of man is (normal force between the man and the machine is proportional to the mass)

    A
    The measured mass of man is `(Mm)/((M+m))`
    B
    The acceleration of man is `(mg)/((M+m))`.
    C
    The acceleration of man is `(Mg)/((M+m))`.
    D
    The measured mass of man is `M`

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