(Potential versus Kinetic energy), energy can be conserved.
There are many different forms of energy. Stored energy is called potential energy and the energy of motion is called kinetic energy.
Potential energy is converted into kinetic energy by using toys and ramps. Potential and kinetic energy work together to make things move, like rubber band powered cars. Energy can be changed from one form to another. Watch the energy from light make the vanes of the radiometer spin.