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Rolling Question

  1. May 12, 2009 #1
    1. The problem statement, all variables and given/known data
    Hi again ,, my second one is easy:

    A tire 0.5 m in radius rotates at a constant rate of 200 rev/min. Find the speed and
    acceleration of a small stone stuck on the surface of the tire (on its outer edge).

    2. Relevant equations

    3. The attempt at a solution
    the Speed of the rock is easy to get (W=200 rev/min = (20*pi)/3 rad/s = (10*pi)/3 m/s)
    about the acceleration : should I get the tangent acceleration or the radial ??
    Last edited: May 12, 2009
  2. jcsd
  3. May 12, 2009 #2


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    Constant angular velocity means that the angular acceleration is zero. So the tangential acceleration is zero.
  4. May 12, 2009 #3
    so the question means i should get the tangent acceleration right not the radial one ?
  5. May 12, 2009 #4


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    [tex]a_t = \alpha r [/tex]

    [tex]a_r = \frac{v^2}{r}[/tex]

    seeing as that [itex]\alpha=0[/itex], which one do you think you should find?
  6. May 13, 2009 #5
    lol ,, got it :) ,, thanks ,, exam questions are so poor -_-
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