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Static equlibrium with friction

  1. Dec 18, 2011 #1
    1. The problem statement, all variables and given/known data

    a 4.0kg block is held against a brick wall and is just kept from sliding down by the force F. The coefficient of friction is 0.35 between the block an d the wall.

    Find the normal force and the minimum force F that will keep the block from sliding.

    block.png

    2. Relevant equations

    Sum Fx = 0
    Sum Fy = 0

    3. The attempt at a solution

    Fx=Fnormal
    Fy+Ffriction=mg

    uFx=Ffriction

    Fy+uFx=39.2
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Dec 18, 2011 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    Hi canicon,
    Your equations are correct, but one is missing.
    It is given that the force encloses a 30° angle with the vertical. That means a relation between Fy and Fx. What is it? Adding this relation to the other equations, you can get Fx and Fy.
    ehild
     
    Last edited: Dec 18, 2011
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