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Homework Help: Circular Motion and Banked Curves

  1. Feb 24, 2010 #1
    1. The problem statement, all variables and given/known data
    A concrete highway curve of radius 60.0 m is banked at a 11.0 degree angle. What is the maximum speed with which a 1500 kg rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.)

    2. Relevant equations
    w f 2 = w i2* t + 1.2 * alpha * t
    theta f - theta i = w i t + t/2 alpha t 2

    3. The attempt at a solution

    Okay, I drew a picture of the problem and I tried to find all the forces acting on the car but I really don't think I've got them all. I know there's the usual gravity, normal force, and centripetal acceleration but I'm not sure if the equations I referenced above are even really relevant.
  2. jcsd
  3. Feb 24, 2010 #2


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    Homework Helper

    In your FBD, centripetal force is not to be on there, centripetal force is a resultant force.

    The resultant normal force (perpendicular to the plane) is zero. You should now be able to find the normal reaction.


    If the car slides down the plane, then friction acts up the plane. What do the resultant of these two force give?
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