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Homework Help: Mechanics problem

  1. Apr 23, 2012 #1
    1. The problem statement, all variables and given/known data
    Homogeneous cube with one edge lying on the floor and the other on a smooth vertical wall. The underside of cube with a horizontal surface makes angle of
    π6
    .What is the value to the coefficient of friction between the cube and the floor to cube remain in balance.


    2. Relevant equations
    ∑F=0

    ∑M=0

    M=rF

    M is momentum of force.


    3. The attempt at a solution
    In static case

    ∑F=0

    ∑M=0

    I need help to write this equation from the problem statement. I don't have idea.
    Because cube is homogenuous the forces are equal from all parts I suppose.

    . Do you have any idea? I think this goes in one line but it is hard for me.
    Tnx for your answer.
     
  2. jcsd
  3. Apr 23, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    hi matematikuvol! :smile:
    homogeneous simply means that (in this case) the weight goes through the centre of the cube

    draw yourself a free body diagram

    the main problem in this case is to find the horizontal distance between the centre and the bottom edge! :smile:
     
    Last edited: Apr 23, 2012
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