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Minimum stopping distance

  1. Dec 9, 2014 #1
    1. The problem statement, all variables and given/known data
    In order to stop a car in shortest distance on a horizontal road, one should,
    (a) Apply brakes very hard so that the wheels stop rotating
    (b) Apply the brakes hard enough to just prevent slipping
    (c) Pump the brakes (press and release)
    (d) Shut the engine off and not apply brakes

    2. Relevant equations
    NIL

    3. The attempt at a solution
    I think the solution might be (a) because after the wheels stop rotating altogether, friction would stop the car entirely.
    But I might as well be wrong.
     
  2. jcsd
  3. Dec 9, 2014 #2

    mfb

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    Staff: Mentor

    Friction stops the car in all setups. But how fast does it stop? What is the force that stops it?
     
  4. Dec 9, 2014 #3
    Well, there is no mention of it in the question...
     
  5. Dec 9, 2014 #4

    PeroK

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    Science Advisor
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    Is this a question from the driving test?
     
  6. Dec 9, 2014 #5

    mfb

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    Staff: Mentor

    Those are questions for you to answer.
     
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