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Ramp problem with friction

  1. Oct 20, 2011 #1
    1. The problem statement, all variables and given/known data
    μs = .300
    Mass = 3.00kg
    Incline = 35°
    What is the minimum normal force applied to prevent the crate from sliding down the incline?

    2. Relevant equations
    μs = Fk / n


    3. The attempt at a solution
    The book solution is 32.1N but I have no idea how they got that.
     
  2. jcsd
  3. Oct 20, 2011 #2

    PeterO

    User Avatar
    Homework Helper

    If this crate is left alone, it will slip down as friction is not big enough.

    One way to stop it would be to apply an appropriate force parallel to the slope.

    What is planned here is to apply a force perpendicular to the slope, which will increase the friction force so that it is strong enough to prevent motion.
     
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