1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook