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Just started Centripetal Force

  1. Jul 12, 2008 #1
    ok the textbook says Centripetal Force always points towards the centre of circle as well as the Centripetal acceleration. But Why?

    Also I was given a diagram in the textbook like the one below. I dont understand why
    Fc = the friction force...
    [​IMG]
    [​IMG]

    could you guys explain this to me please?
     
  2. jcsd
  3. Jul 12, 2008 #2

    Kurdt

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    The force must always point toward the centre of a circle to keep the particle or object moving round in a circle. I don't know why the centripetal force equals the friction force, it depends on the context. Could you give more information?
     
  4. Jul 12, 2008 #3
    thank you.
    that diagram i posted comes from a question related to car that is rounding a curve on a level road.
     
  5. Jul 12, 2008 #4

    Kurdt

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    In that case the centripetal force will equal the static friction when the car is going round the curve at a speed just before slipping. If you go round a curve too fast the friction will not be enough to keep the car from sliding and you will skid off.
     
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