## Work in Physics Terms

**Introduction on work in physics terms**

We often listen to words like " This job requires a lot of work." What does 'work' really mean here? If we lift a box from the ground level and place this on a high shelf, we feel tired after the job is completed; we feel that we have done some work. How is this done? Gravity (which is the force with which earth attracts every object towards its centre) pulls the box downward when we lift the box and hence, we are doing work against this gravitational force. This is true for any type of work.

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**Explanation of work in physics terms**

Work always involves overcoming some opposing force. Suppose that instead of lifting the box, we push it across a rough floor. In this case, we are not working against the gravitational force - the box is at the same height throughout the movement. Instead, we are now working against the frictional force that exists between the moving box and the floor. How do we measure work here? The amount of work done in this situation depends on how much force is exerted and how far the object moves. If, in the above example, one more box is placed over the first box and the two boxes are pushed through the same distance, then the work done increases as we need to apply a larger force to push the boxes.

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**Conclusion to work in physics terms**

Similarly, increasing the distance through which the boxes are moved also increases the amount of work done. One can therefore say that the work done is directly proportional to both the applied force and the distance through which the force acts. As a matter of fact, work(W) is equal to the product of the applied force (F) and the distance (D) through which the force acts and may be expressed as

work (W) = force (F) x distance (D) .