A scientific law that says energy cannot be created or destroyed but may be changed from one form to another ?

Answer 1

That's the Law of Conservation of Energy, which is also expressed as the First Law of Thermodynamics. The first major steps towards formalization of this law were taken by Leibniz in the late eighteenth century.

Answer 2

I think you have the theory a little off. Matter can be converted into energy and energy can be dissipated by moving matter.

Energy equals mass times velocity squared divided by two. Velocity has two segments speed and direction. If mass goes to zero there is no energy. If speed goes to zero there is no energy.

Energy can be changed into potential energy. Raise a mass above the earth three feet say by putting it on a shelf. You have changed energy to potential energy. Knock the mass off the shelf and it will gain energy as it falls because gravity will accelerate it giving it more energy.

A body tends to move at the same velocity unless acted upon by a force. Newtonian physics.

There is another issue and that is with entropy. Entropy basically says that the energy in the universe is dissipating.

I think there is no theory of science like you quoted.

Answer 3

The Law of Conservation of Energy

Answer 4

The first law of thermodynamics.

Answer 5

Doing your homework...2007 style!

Answer 6

first law of thermodynamics...

check out: http://en.wikipedia.org/wiki/Laws_of_thermodynamics