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Friction question

  1. Sep 18, 2005 #1
    A car is traveling at 50.0 mi/h on a horizontal highway. If the coefficient of static friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop? What is the stopping distance when the surface is dry and the coefficient of static friction is 0.600?

    I'm uncertain how to solve this question because the only relationships between the coefficient of friction and acceleration that I'm aware of require knowing the normal force, and this question does not give the normal force or the mass of the object so the normal force can be calculated.

    Any guidance would be appreciated.

  2. jcsd
  3. Sep 18, 2005 #2

    Doc Al

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    Staff: Mentor

    Don't give up so easily. Call the mass of the car "m" and see what happens. If information is not given, perhaps it's not needed. :wink:
  4. Sep 18, 2005 #3
    Figured out "m" cancels out in the equation. Got the correct answer now. Thanks Doc!

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