In Physics, Mechanical Energy is considered as the sum of both the potential energy and kinetic energy: E=U+K. It is the type of energy that is most associated with the motion and position of an object. According to the principle of conservation of Mechanical energy, if an object in an isolated system is moved in the opposite direction of a conservative net force, the potential energy will increase and if the speed changes, the kinetic energy of the object is changed as well. But in all practical systems, there are a lot of non-conservative forces that acts on this body, eg friction. Even if they are negligible in value, it is present. The main difference between a conservative and a non-conservative force is that a conservative force is not path dependent while non-conservative force is. In elastic collisions, the Mechanical energy is conserved but in inelastic collisions, some Mechanical energy is converted into heat. Many technological devices exist that convert this Mechanical Energy into other energy formats and vice-versa.
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