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Homework Help: Physics on Coefficient of Friction

  1. Feb 23, 2012 #1
    1. The problem statement, all variables and given/known data

    What is the coefficient of friction of a block resting on a board at a 15° angle to the horizontal.

    2. Relevant equations
    μ= Fk
    Mg



    3. The attempt at a solution

    I'm very lost at where I find Fk or Mg...?


    Thanks for help in advance.
     
  2. jcsd
  3. Feb 23, 2012 #2

    berkeman

    User Avatar

    Staff: Mentor

    Welcome to the PF.

    Start by drawing a free body diagram (FBD) of the block. What is the force down parallel to the board? The force of friction points back up parallel to the board, and opposes the force trying to slide the block down the board ramp.
     
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