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Homework Help: Stopping the car

  1. Dec 13, 2003 #1
    can someone explain to me the difference btw
    (a) apply the brakes just hard enough

    and

    (b) brakes are applied too hard??
     
  2. jcsd
  3. Dec 13, 2003 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Apply the brakes too hard and the tires will slip on the road; apply them just right, and they won't slip. The only force stopping the car is the friction of the road on the tires: you want the friction to be as great as possible. If the tires slip you have kinetic friction, which is weaker than static friction.
     
  4. Dec 13, 2003 #3
    thank you doc al.
     
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