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Rotational movement - tourque

  1. Jul 16, 2012 #1
    If I have a sphere at rest on top of a ramp, if friccion is negligible, the only forces acting on it would be gravity and the normal force. Both of these go through it's axis of rotation which would be the spheres center. What would cause the rotation then so τ≠0?
     
  2. jcsd
  3. Jul 16, 2012 #2

    Doc Al

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    Staff: Mentor

    What makes you think it would rotate?
     
  4. Jul 16, 2012 #3
    I guess theres no rotation at all unless theres friccion? boo...
     
  5. Jul 16, 2012 #4

    Doc Al

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    Staff: Mentor

    Right. Without friction, the sphere will just slide.
     
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