Principles of Energy Conservation

Ciara: Principles are laws about laws. They are meta laws. One needs first to have at least two rival theories concerning a physical situation to which the principle purports to apply. In the case of the pendulum, all experiments done so far have refuted the model that predicts that energy is spontaneously created. Whenever it looks as though the pendulum swings to higher and higher points, it is because some nearby system is actually roviding the energy to do so.