Energy is the capability of a body to do work. It can take many forms: heat, light, sound, electricity, magnetism, nuclear and so on. However, our concern is with mechanical energy. Mechanical energy is of two types: kinetic energy and potential energy. Kinetic energy is the energy of a body by virtue of its motion. Potential energy is the energy of a body by virtue of its position. A body is held so that it is stationary and then released; if it moves then it possesses potential energy. Examples include a stone dropped out of a window or the release of a stretched catapult. In order to develop results systematically from our knowledge of forces, we shall first define work.
KeywordsPotential Energy Maximum Speed Mechanical Energy Frictional Resistance Line Integral
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