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Mass spinning on table; connected to dangling mass

  1. Feb 27, 2013 #1
    1. The problem statement, all variables and given/known data
    oh1cg9.png




    3. The attempt at a solution

    7 Part(a)
    It can be seen that Eα > Emin, so ue is always bounded below Eα.
    2eg5vtw.png

    7 Part (b)
    It can be seen that for α = 1/2, Eα = Emin = -1/4. Thus for α < 1/2, the mass will start to drop.
    2gwt6xt.png

    What puzzles me is how do you explain this using forces?

    Force acting on mass on table = T
    Force acting on mass below = mg - T

    The mass would slide down if mg > T but how do i express this in terms of α??
     
  2. jcsd
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