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Determining an expression for acceleration

  1. Oct 3, 2012 #1
    1. The problem statement, all variables and given/known data

    Here is the question: http://i1110.photobucket.com/albums/h459/granolup/Untitled.png [Broken]

    It is assumed that the blocks are not moving.

    2. Relevant equations

    F=ma
    N=mg
    friction = umg

    3. The attempt at a solution

    I have started out drawing free-body diagrams for each of the three wedges.
    For m1, there is a force due to gravity pointing downwards, a normal force pointing to the top right.
    For m2, there is a force due to gravity pointing downwards, a normal force pointing to the bottom left, and the force of kinetic friction pointing to the top left.
    For m3, there is a force due to gravity pointing downards, and a normal force pointing upwards.
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 3, 2012 #2

    tiny-tim

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    welcome to pf!

    hi kobylorat! welcome to pf! :wink:
    ok so far (but isn't there also a friction force from the ground, and between 2 and 3?) …

    now write out the equations of motion, including a purely geometric equation which specifies that block 2 stays on block 1 :smile:
     
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