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INTRODUCTION - Chapter 11 Work & Energy class 9 ncert solutions Science - SaraNextGen [2024]


Question 1:

A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?

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Answer:

When a force F acts on an object to displace it through a distance S in its direction, then the work done W on the body by the force is given by:

Work done = Force × Displacement

W = F × S

Where,

F = 7 N

S = 8 m

Therefore, work done, W = 7 × 8

= 56 Nm

= 56 J

Also Read : Page-No-149:-Chapter-11-Work-&-Energy-class-9-ncert-solutions-Science

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