ABSTRACT
A force does work when is applied to an object moving it along a certain distance or displacement. This work is energy and can be potential or kinetic. Recall that potential energy is available to do work in some other form or at a different time. Kinetic energy is a form of energy due to movement at a certain velocity. One joule of energy corresponds to the work done by a force of one newton acting for 1 m (J = Nm). A very important concept is power, which is the rate of change of work or energy. The unit of power is watt, which is equal to 1 J/second.
