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Friction question (intro level)

  1. Jul 21, 2010 #1
    A banked circular highway curve is designed for traffic moving at 55 km/h. The radius of the curve is 213 m. Traffic is moving along the highway at 49 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road?

    I found the angle to be 6.38 degree. Is it right? How do I go from here?
    Thanks,
     
  2. jcsd
  3. Jul 21, 2010 #2

    collinsmark

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    That's pretty close to what I came up with, differing by only the 3rd significant digit. :cool:
    A free body diagram (FBD) would be a good start. Your FBD should look pretty similar to the FBD in the first part, except there is now a frictional force involved, parallel to the surface of the road.

    (Then prepare yourself for bit of algebra). http://www.websmileys.com/sm/cool/694.gif
     
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