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Introduction
This chapter deals with the related concepts of work, energy and powerâthree fundamental quantities in physics. We will find out that the work done by the net force is the change in the kinetic energy of the body. Kinetic energy is one of many forms of energy that are used to describe a mechanical system, along with gravitational and elastic potential energies. We will see how the total mechanical energy of a system (kinetic and potential) stays the same in the absence of resistive forces, leading to our first conservation law.