We say that work is done when two conditions are met:
- A force is applied on an object, and
- The object undergoes displacement in the direction of the applied force.
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When do we say that work is done?
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Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
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