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Friction of a car going in circles

  1. Nov 24, 2008 #1
    1. The problem statement, all variables and given/known data
    A car that weighs 900 kilograms is driving around a racetrack, the radius of the racetrack is 100 meters. Thecar has a constant speed of 110 km/h. The friction coefficient between the tires and the track is 0.980.


    a) The car's acceleration
    b) The size of the friction

    2. Relevant equations

    3. The attempt at a solution

    I got a to 9.34 m/s2 which I believe is correct. I'm having a much harder time with b which I get to 8,65 kN which I know is incorrect.

    Please help! Thanks!
  2. jcsd
  3. Nov 24, 2008 #2
    could you show some equations you found
  4. Nov 24, 2008 #3
    Ok I tried the Latex thing but I couldn't figure it out so i'll just write normally.

    For the acceleration I used a = v2 / r = 30.52 / 100 = 9,34.

    The second one is the one I'm sure must be wrong but I don't know what else to try. I'm using the equation for kinetic friction fk=[tex]\mu[/tex]k*n which should be simply 0.98*900*9.80 =8652.42 = 8.65 kN but that isn't the answer.
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