### Theory:

To understand the way we are looking at the term 'work' and define it from the perspective of science, let us consider some situations:
Push a stone lying on a surface. The stone moves through a distance. You exerted a force on the stone, and the stone got relocated. In this situation, we assume that the work is done.
Pull and push factor
A person pulls a trolley, and the trolley is relocated to some distance. He has applied a force on the trolley, which results in the displacement of the trolley. Therefore, work is done.

A man pulling a trolley
Consider you take books and arrange them in another place. To do this, you exerted force on the books to put them in another place. Hence, work is done.
Arranging books

A closer look at the above scenarios shows that two conditions require to be satisfied for work to be done:
1. a force should act on an object, and
2. the object must be relocated or displaced.
If any one of the above-said conditions does not exist, work is not done. This is the way we view the term 'work' in science.