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Hydraulic Brake Problem How to Start?

  1. Nov 18, 2011 #1
    1. The problem statement, all variables and given/known data
    A hydraulic brake system is shown. The
    area of the piston in the master cylinder is
    6.41 cm2, and the area of the piston in the
    brake cylinder is 1.69 cm2. The coefficient of
    kinetic friction between the brake shoe and
    the wheel drum is 0.449.
    How large is the frictional force between the
    brake shoe and the wheel drum when a force
    of 44 N is exerted on the pedal?
    Answer in units of N


    2. Relevant equations
    [itex]\frac{F1}{A1}[/itex] = [itex]\frac{F2}{A2}\frac{}{}[/itex]
    A1 = 6.41 cm[itex]^{2}[/itex]
    A2 = 1.69 cm[itex]^{2}[/itex]
    F = 44 N
    μ = 0.449
    F = μF[itex]_{n}[/itex]

    3. The attempt at a solution
    I don't know how to relate coefficient to this problem. Would you give me some hint please?
     
  2. jcsd
  3. Nov 19, 2011 #2

    Simon Bridge

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    It is difficult to see what your problem is... you can convert the force applied to the pedal to force applied to the drum?
     
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