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Need Help- Centripetal car problems, finding the angle

  1. Oct 13, 2012 #1
    1. The problem statement, all variables and given/known data

    Find the angle at which a curve of radius 100m, should be
    banked in order that a car moving at a speed 90 km/h will not
    need any frictional force to round it

    3. The attempt at a solution
    Alright so what i did was, i made two equations....
    Fc=Fnsinθ
    ma=mgsinθ
    v^2/r=gsinθ this is the horizontal force toward the centre of the circle.

    And now for the verticle equilibrium
    Fg= Fncosθ is this correct i am not understanding how i would do this?

    AND THE REST i am really confused about what to do...
     
    Last edited: Oct 13, 2012
  2. jcsd
  3. Oct 13, 2012 #2
    Try writing the equations for parallel and perpendicular to the road.
    Just keep in mind that you aren't dealing with an inertial reference frame. The [itex]F_c[/itex] pointing in that is your centripetal force, is the same as a centrifugal force pointing out in this reference frame.
     
  4. Oct 14, 2012 #3
    Who r u Lola. You go to my school cause all of your questions you're asking are from an assignment. Message me back, cause i wanna compare answers with u.
     
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