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Homework Help: Unbanked circular motion

  1. Oct 15, 2008 #1
    1. The problem statement, all variables and given/known data
    a highway curve has a radius of 122m. At what angle should the road be banked so that a car travellin at 26.8m/s (60mph) has no tendency to skid sideways on the road? (frictional force is zero)


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 15, 2008 #2
    Did you have a go at it?

    Sam :smile:
     
  4. Oct 15, 2008 #3
    no...can you help me to solve that question..
    argh...my head wants to explode....
     
  5. Oct 15, 2008 #4
    To start of you want to draw the setup as a force diagram at an arbitrary angle (called [itex]\theta[/itex] say), with:
    - The normal reaction
    - The centrifugal force from acceleration in a circle
    - The Weight of the car

    You need to find the angle at which all these forces are balanced. Does this help?

    Sam
     
  6. Oct 15, 2008 #5
    i will try it tonight :smile:
     
  7. Oct 15, 2008 #6
    thanks a lot...a got it..:) huh
     
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