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Pendulum Problem with unknown angle

  1. Oct 19, 2011 #1
    A pendulum (with string length "L") and aball of mass "m" is pulled back to a horizontal position and then released. Assuming that θ is the angle between the string and the vertical, find the speed of the ball (v) at an angle of θ as a function of m,g,L, and/or θ.


    I just can't get my mind around this problem.....
     
  2. jcsd
  3. Oct 19, 2011 #2

    Delphi51

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    Welcome to PF, jg!
    I could be horrendous using motion formulas.
    Have you considered an energy approach? The initial Ek is easy. Can you find the height when at angle θ and thus the potential energy? From that you can get the Ek at θ and then the speed.
     
  4. Oct 19, 2011 #3
    Thank You!
    Ok, so I guess im actually having problems with finding the potential energy. I'm completely blanking.
     
  5. Oct 19, 2011 #4

    Delphi51

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    PE = mgh
     
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