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प्रश्न
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उत्तर
'Work' is said to be done when the applied force makes the body move i.e., there is a displacement of body.
It is equal to the product of force and the displacement of the point of application of the force in the direction of force.
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संबंधित प्रश्न
Give reasons for the following. No work is done if a man is pushing against a wall.
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
State the energy transformation on the following:
Electricity is obtained from solar energy.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Name the physical quantity associated with the 'rate of doing work'.
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
