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Conceptual question about torque and balls

  1. Dec 1, 2007 #1
    [SOLVED] Conceptual question about torque and balls

    1. The problem statement, all variables and given/known data
    Take a look at the following thread:

    https://www.physicsforums.com/showthread.php?t=147053

    In this thread, the torque is measured from the center of the ball. Can I measure it from the point where the ball and the ground touch eachother, so the torque is:

    T = mgsin(a)*R = I*alfa?

    I tried, and it gives me that a = (3/2)gsin(a), which is wrong - why?
     
  2. jcsd
  3. Dec 1, 2007 #2
    No, then again I get (2/3) rather than (3/2) - but still it doesn't work.
     
  4. Dec 1, 2007 #3
    Any suggestions? I would really like to know, whether am I wrong or right about this.
     
  5. Dec 3, 2007 #4
    No suggestions at all :)?
     
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