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Energy conservation in simple pendulum

  1. Jul 5, 2011 #1
    Hello everyone! I've found this problem in my exercises book, and I'm having slight troubles solving it.
    "Consider a simple pendulum with mass m, on a string with l length. Considering that the position of pendulum is determined with the angle [itex]\theta[/itex] and noting that the string DOES NOT do any work, considering all the forces acting on the pendulum show that the energy conservation law is applied"

    Well, I know how to prove that the ECL is applied without using the forces (considering that the Ep is 0 at the lowest point, and that the Ek is 0 at the highest).
    Any ideas?

    Thanks in advance

    (I wasn't sure if this is supposed to go to "homework" section, since it isn't a homework...)
  2. jcsd
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