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In the earlier chapters we had studied about the motion of objects, force and gravitation. Work is another dimension of physics that helps us to understand and interpret many natural phenomena. Energy and Power are closely related to work. In this chapter we are going to learn about these three physical concepts.

Living beings need to perform life processes to survive. To perform these activities they need energy which they get from the food they eat. What about machines? They also perform many activities; they do work which would be too difficult for us to perform. They make our life simpler. Don’t they also need energy? What are the substances that give them energy?

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