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Banked curves, coefficient of friction problem!

  1. Feb 15, 2012 #1
    1. The problem statement, all variables and given/known data

    A road with a radius of 74.8 m is banked so that a car can navigate the curve at a speed of 15 m/s without any friction. When a car is going 21.1 m/s on this curve, what minimum coefficient of static friction is needed if the car is to navigate the curve without slipping?

    2. Relevant equations



    3. The attempt at a solution

    I figured out the angle by doing (v^2)/gr but I don't know how to find the coefficient of static friction. PLEASE HELP!
     
  2. jcsd
  3. Feb 16, 2012 #2

    ehild

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    Homework Helper
    Gold Member

    Draw a free-body diagram. The resultant of all forces has to be equal to the centripetal force.


    ehild
     
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