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Lagrangian about rolling disk on a horizontal plane

  1. Mar 18, 2017 #1
    1. The problem statement, all variables and given/known data

    upload_2017-3-18_21-39-22.png
    2. Relevant equations


    3. The attempt at a solution

    This is the problem in Goldstein's classical mechanics exercise 1.11
    I wonder why the solution doesn't consider rotational kinetic energy (1/2 I w^2)
    So, L= T = 1/2mx^2 + 1/2 I w^2 .
     
  2. jcsd
  3. Mar 18, 2017 #2
    This problem was discussed here.
     
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