Q. 204.8( 8 Votes )

In each of

Answer :

Work is done whenever the given two conditions are satisfied:

(a) A force acts on the body.


(b) There is a displacement of the body by the application of force in or opposite to the direction of force.


(i) In this case, the direction of force acting on the block is perpendicular to the displacement. Therefore, work done by force on the block will be zero.


(ii) In this case, the direction of force acting on the block is in the direction of displacement. Therefore, work done by force on the block will be positive.


(iii) In this case, the direction of force acting on the block is opposite to the direction of displacement. Therefore, work done by force on the block will be negative.

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