Principles

        The principles of Harmonic Motion are: when an object is moved from its starting; or initial, position, a force is made. When this force moves the object, the object has kinetic energy which allows it to move to the point where it stops in the air, as shown in the model below. When the object stops, it has potential energy. When it begins to move once again, it has no potential energy, but has kinetic energy once again. Since energy can't be created or destroyed, as the Law of Conservation of Energy states.

This image was provided by wikipedia at http://en.wikipedia.org/wiki/Harmonic_oscillator