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प्रश्न
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
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उत्तर
When a coolie carries a load while moving on a ground, the displacement is in the horizontal direction while the force of gravity acts vertically downward. So the work done by the force of gravity is zero.
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संबंधित प्रश्न
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
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(Hint: The body is acted upon by the centripetal force.)
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Name the quality which is measured in kW.
State the factors on which moment of force about a point depends.
What is a centripetal force?
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Derive a relation between the S.I. and C.G.S. unit of force.
A man weighing 700 N runs up a flight of 15 steps, each 20 cm high, in 5 seconds. Calculate the power of the man.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
