Law of conservation of energy

[50936]

Is there an equation for the law of conservation of energy?

[Hootenanny]

Is there an equation for the law of conservation of energy?
There are numerous mathematical statements of the concept of conservation of energy, depending on which field the concept is applied to.

[HallsofIvy]

How about
E_1+ E_2+ \cdot\cdot\cdot+ E_n= C
where E_1, E_2, E_n are all the different kinds of energy in a system and C is a constant? In other words, energy can change from one form to another or from one object to another but in a given isolated system the total remains constant.

I started that a little facetiously but we use "kinetic energy+ potential energy= constant" in simple problems all the time.

[russ_watters]

Only a little facetiously - there are lots and lots of problems that are solved by writing an energy conservation statement and solving it (or the similar sum of forces = 0).