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Homework Help: Banked circular motion

  1. Oct 16, 2008 #1
    1. The problem statement, all variables and given/known data

    A car travels at a speed of 21 m/s around a
    curve of radius 31 m.
    The acceleration of gravity is 9.8 m/s2 .
    It weighs 2600 kG, and is banked at 23 degrees.
    Suppose the friction force is sufficient to keep the car from skidding. Calculate the
    magnitude of the normal force exerted on the
    car by the road’s surface.
    Also, calculate the magnitude of the friction force.

    2. Relevant equations


    3. The attempt at a solution

    Fstatic*cos 23 = m*v2/r
    Would that make Fstatic 441*2600/(31 cos 23) = 40181.3164?
    I have no clue how to find the normal...
  2. jcsd
  3. Oct 17, 2008 #2


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    Homework Helper

    Hi petsgomoo13,

    I don't think this is right. You have correctly found the horizontal component of the frictional force, which is right because the centripetal acceleration is horizontal. But there is another force present that has a horizontal component. What would that be? Do you see what your equations would then become?
  4. Oct 17, 2008 #3
    Try drawing a FreeBody Diagram with all the forces ACTING on the body, that'll help
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