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Potential energy of pendulum in terms of displacement.

  1. Mar 28, 2013 #1
    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. jcsd
  3. Mar 28, 2013 #2
    By the way this is not homework, just a serious question to try to solve coupled harmonic oscillators :(
  4. Mar 28, 2013 #3


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    Homework Helper

    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?!
  5. Mar 29, 2013 #4
    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!
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