Meaning of Work
Work is defined as the application of force to an object or body such that the object or body moves through a distance. Work is said to be done whenever a load moves through a distance. i.e. work = force × distance moved in the direction of the force (f × d).
Work involves applying force over a certain known distance. Work is therefore a product of force and the distance through which the force is applied. The unit of energy and work is known as Joules (j). A joule is the work done when a force of one (1) newton moves through a distance of one (1) metre.
Example 1: If the mass of a block is 5kg, the work done by the block in moving up through 0.3m is given by:
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