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Homework Help: Lagrangian mechanics problem:

  1. Oct 27, 2012 #1
    1. The problem statement, all variables and given/known data


    Write the lagrangian equations for:

    A simple pendulum whose suspension point oscillates horizontally in its plan according to the law


    x = a.cos(ωt)


    My problem is trying to know which are the generalized coordinates.

    i considered :


    x (θ) = a.cos(ωt) + l.sinθ

    y (θ) = l.cos θ


    Is that correct?
     
    Last edited: Oct 27, 2012
  2. jcsd
  3. Oct 27, 2012 #2

    TSny

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    That looks good. But to be specific, what is (or are) your generalized coordinate(s)?
     
  4. Oct 27, 2012 #3
    θ isnt it?
     
  5. Oct 27, 2012 #4

    TSny

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    Right. I was just making sure. Thanks.
     
  6. Oct 27, 2012 #5
    ok thanks for the help.
     
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