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Homework Help: Finding the friction coefficient?

  1. Oct 23, 2008 #1
    1. The problem statement, all variables and given/known data

    Hopping into your Porsche, you floor it and accelerate at 11.2 m/s2 without spinning the tires. Determine the minimum coefficient of static friction between the tires and the road needed to make this possible.

    2. Relevant equations

    well I know fs/N= the coefficient, however, even though N=ma, you dnt have an m nor an a. i just dnt see adequate info given. help!
  2. jcsd
  3. Oct 23, 2008 #2


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    why do you say N=ma?
    the acceleration, a, is given. Write the Newton 2 equation, looking in the x direction. What's the net force in that direction? Maybe you won't need to know m
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