Q1 of 33 Page 149

When do we say that work is done?

Work is said to be done whenever the given conditions are satisfied:

(i)A force acts on a body.


(ii) There is a Displacement in the body caused by the applied force along the direction of the applied force.


More from this chapter

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1

A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see Figure below). Let us take it that the force acts on the object through the displacement. What is the work done is this case?

 2

Write an expression for the work done when a force is acting on an object in the direction of its displacement?

 3

Define 1 J of work.

 4

A pair of bullocks exerts a force of 140 N in a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?