2)Principle+of+Conservation+of+Energy

= __Principle of Conservation of Energy __ =

= = = __Local conservation Law __ =
 * =Energy is subject to the law of conservation of energy =
 * =Energy can neither be created nor destroyed by itself =
 * =Energy can only be transformed from one form to another (e.g. Kinetic energy --> Gravitational Potential Energy, note amount of energy is the SAME) =
 * =Total energy of the universe cannot change =

= = =//"There is a fact, or if you wish, a law, governing natural phenomena that are known to date. There is no known exception to this law; it is exact, so far we know. The law is called conservation of energy ; it states that there is a certain quantity, which we call energy, that does not change in manifold changes which nature undergoes. That is a most abstract idea, because it is a mathematical principle; it says that there is a numerical quantity, which does not change when something happens. It is not a description of a mechanism, or anything concrete; it is just a strange fact that we can calculate some number, and when we finish watching nature go through her tricks and calculate the number again, it is the same."// = 
 * =Most types of energy are also subject to strict local conservation laws, with the execption of gravtitational energy =
 * =Energy can only be exchanged between adjacent regions of space =

=__ Link to Roller Coasters __= ~ // -The Feynman Lectures on Physics //
 * Gravitational Potential Energy that the roller coaster has at the start of the ride is converted to only kinetic energy, thermal energy and sound energy
 * To ensure that as much of the GPE is converted to KE as possible, roller-coasters have to have minimum friction (hence wheels)
 * Knowing that some of the energy is lost to friction, roller-coaster track designers have to design tracks such that enough of the gravtiational potential energy is converted to kinetic energy to ensure that the roller-coaster completes the track