# Potential energy of pendulum in terms of displacement.

1. Mar 28, 2013

### Nuclearturtle

Hi guys, I'm having troubles finding how to write the potential energy of a 1D pendulum down. In terms of displacement however. This should be easy and it is, but my professor had this nice "clean" solution whereas mine is really dreadfull, any help? :)

edit: Ok nvm guys. I was thinking I went crazy for not finding it, since I almost have my physics license. But my professor used a Taylor approximation, nothing to worry about.

Last edited: Mar 28, 2013
2. Mar 28, 2013

### Nuclearturtle

By the way this is not homework, just a serious question to try to solve coupled harmonic oscillators :(

3. Mar 28, 2013

### BruceW

hi, turtle :) welcome to physicsforums

Do you still have a question about pendulums? I agree Taylor approximation is the way to go. (That's why they say 'for small angles'). Also, do you mean 2D pendulum. And what's a physics license?!

4. Mar 29, 2013

### Nuclearturtle

I meant a 1D pendulum in the sense that it only oscilates in one (!) direction. Of course this could represent a real 3D pendulum oscillating along just one axis.

Concerning the physics license, I didn't know how to sai it right, I meant physics degree or something like that. Lets just say I'm studying physics! This being the reason why I was so concerned not finding this "easy" solution :)

Thx for offering help anyway!