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When you press braking pedal -- wheel road surface tangent F

  1. Feb 3, 2015 #1
    - You are driving car with 100 mile/hour

    - You are pressing brake pedal.

    - The speed of car is suddenly gone down. Decelerated.

    - However, Wheel is rolling on road without sliding and car stopped smoothly finally.


    In this case,

    - the tangent force acting on road surface is related with deceleration rate dv/dt ?

    - or as long as there is no sliding of wheel, tangent force is not relevant.

    - Please do not count detailed contact mechanic.
     

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    Last edited: Feb 3, 2015
  2. jcsd
  3. Feb 3, 2015 #2

    billy_joule

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    Science Advisor

    Can you draw a free body diagram of the situation? Could a car ever move (on level ground) if no tangent force could act? ie if the wheels were frictionless?
     
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