# Force and PE

1. Dec 18, 2004

### UrbanXrisis

does the integration of Force equal negative potential energy?

$$\int{F}={-U}$$

Also, what is the difference between $$\oint$$ and $$\int$$?

2. Dec 18, 2004

### Nylex

Yeah, it should seeing as F = - dU/dx.

The integral sign with a circle is an integral around a closed loop/surface I think, whereas the normal integral sign isn't.

3. Dec 18, 2004

### UrbanXrisis

so: W’=F=-dPE/dt

4. Dec 18, 2004

### arildno

The $$\oint$$ is often used for a curve integral (whether or not the curve is looped (closed) or not).