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Homework Help: Friction on an inclined plane

  1. Aug 12, 2007 #1
    1. The problem statement, all variables and given/known data
    Does kinetic friction and static friction act upon a car travelling downhill (without acceleration by the car)?

    2. Relevant equations

    3. The attempt at a solution
    Is it kinetic because the wheels rub against the surface and the car is in motion? But is it also static because the wheels are rolling downhill and at each point in time the wheels are stationary in their contact with the ground?
  2. jcsd
  3. Aug 12, 2007 #2

    Doc Al

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    Staff: Mentor

    It's one or the other, but not both. If the tires slip against the surface, it's kinetic friction; if the tires roll without slipping, it will be static friction.
  4. Aug 13, 2007 #3
    Thanks, that helped a lot!
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