Work is done when a force produces motion. And for doing work energy is required. This energy we get from the food which we eat and if work is done by machine, then energy is supplied by fuels or by electricity.

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Power for rotational motion is equally as important as power in linear motion and can be derived in a similar way as in linear motion when the force is a constant. The linear power when the force is a constant is P = →F⋅→v. If the net torque is constant over the angular displacement

Class 9 IX Mathematics NCERT TEXTBOOK and SOLUTIONS +6 more

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1. movement, or a tendency to move, towards a centre of gravity, as in the falling of bodies to the earth. 2. movement towards or attraction to something.

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