Can Work Done Be Zero Even If Force Acts on the Body?

Can work done be zero even if force acts on the body?

एक पंक्ति में उत्तर

Yes, for e.g. if you push a wall, you apply force on it but no work is done since the displacement is zero.

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अध्याय 1: Force, Work, Energy and Power - Exercise 1.4 iii [पृष्ठ ३९]

अध्याय 1 Force, Work, Energy and Power
Exercise 1.4 iii | Q 2 | पृष्ठ ३९

Work done by a boy depends on the time in which he does work.

Define work.

Is work a scalar or a vector quantity?

What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.

Is the motion of moon around the earth in circular path an accelerated motion?

Write an expression for work done by a force depends?

(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.

How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m³ of water from a depth of 15m. [Take g = 10 N kg⁻¹]

A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg⁻¹).