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 dr; the vector dr 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 dr is defined as

 

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FIGURE 11.1

 

The work of force F during ...

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