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Homework Help: Find Frictional force on a block

  1. Oct 5, 2011 #1
    1. The problem statement, all variables and given/known data

    A block of mass 9 kg rests on a plane inclined
    at an angle of 30◦
    . The static coefficient of
    friction between the block and the plane is
    0.7.
    What is the frictional force on the block?
    1. 9.36841 N
    2. 76.3834 N
    3. 53.4684 N
    4. 44.1 N
    5. 30.87

    It is not # 3. I know that for sure.

    2. Relevant equations

    F=ma
    Ff=μ*Fn

    3. The attempt at a solution
    I have no idea
     
  2. jcsd
  3. Oct 5, 2011 #2
    Have you tried drawing a free body diagram?
     
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