1.6(c). Work

In our daily language, we use the word ‘work’ for some sort of exertion, physical or mental or at times for various activities eg., while writing we say that we are doing work.

But in Physics, the term ‘work’ is used in relation to the displacement produced by the force.The work is said to be done only when a body moves under the influence of a force. If there is no motion produced in the body even when a force acts on it, the work is said to be zero.

Work is said to be done only when the force applied on a body makes the body move (i.e., there is a displacement of the body).

Work can only be done if the object or system has energy. When work is done energy is transferred.

work done = force x distance moved

W=F×d

It is a scalar quantity

S.I unit is joule(J).

Since

work done = force × distance moved

1 joule = 1 newton× 1 metre

Work done and energy transferred are measured in joules (J). The work done on an object can be calculated if the force and distance moved are known.

Objects raised against the force of gravity contain gravitational potential energy.

The more mass an object has and the faster it moves, the more kinetic energy it has.

work