# Law of conservation of energy

1. Aug 5, 2008

### 50936

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

2. Aug 5, 2008

### Hootenanny

Staff Emeritus
There are numerous mathematical statements of the concept of conservation of energy, depending on which field the concept is applied to.

3. Aug 5, 2008

### HallsofIvy

Staff Emeritus
$$E_1+ E_2+ \cdot\cdot\cdot+ E_n= C$$
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.

4. Aug 5, 2008

### Staff: Mentor

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).