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Sliding friction on a wheel

  1. Sep 9, 2009 #1
    How is a sliding wheel is opposed by static friction?
    Static friction acts only when the body is about to move.
    My point is
    if the wheel is has a linear velocity and angular velocity than kinetic friction should act on the body rather than static friction.
     
  2. jcsd
  3. Sep 9, 2009 #2

    berkeman

    User Avatar

    Staff: Mentor

    Look at the point where the wheel contacts the ground. Is the wheel turning without slipping? That is, is the linear velocity just related to the angular velocity and the radius? Or is the wheel sliding on the ground as well as rotating? If there is no slippage, you would use the static friction coefficient.
     
  4. Sep 10, 2009 #3
    that means cause the point of contact is motionless, we call it static friction.
    thanks a lot.
     
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