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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.
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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.
 
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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.
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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.