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Homework Help: Speed of a bicycle - circles

  1. Mar 8, 2006 #1
    Suppose you ride a bicycle on a horizontal surface in a circle with a radius of 20 m. The resultant force exerted by the road on the bicycle (normal force plus frictional force) makes an angle of 15 degs with the vertical.
    a. What is your speed?
    b. If the frictional force is half its maximum value, what is the coefficient of static friction?

    The problem is I got 2 equations that i can think of to solve for a). One equation is a=V^2/r and the other is F=mrw^2. But for the second equation I don't know the w(angular vel) and for the first I don't know a(acceleration). So how do I solve this?
  2. jcsd
  3. Mar 8, 2006 #2


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    Science Advisor
    Gold Member

    Your rotational force is
    Can you use this to find an expression for your frictional force? (hint: no math needed)
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