## 11

## Work, Energy and Power

##### WORK OF A FORCE

The work done by a force on a moving body is defined as the product of the force and the distance moved in the direction of the force.

Consider a particle of mass *m* which moves from a point A to a neighbouring point A′, as shown in Figure 11.1. If **r** be the position vector corresponding to point A, the small vector joining A to A′ may be denoted by the differential d**r**; the vector d**r** is called the displacement of particle. Now let us assume that a force *F* is acting on the particle. The work of the force *F* corresponding to the displacement d**r** is defined as

**FIGURE 11.1**

The work of force *F* during ...

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