Q1 of 33 Page 148

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?

We know that,

Work done = Force × Displacement


W = F × s


Given,


Force, F = 7 N


Displacement, s = 8 m


W = 7 × 8


= 56 J


Therefore, the work done is 56 J


More from this chapter

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1

When do we say that work is done?

 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?