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Free body diagram drawing for a two force members on machine

  1. Jul 12, 2015 #1
    1. The problem statement, all variables and given/known data
    When a force of 2 lb is applied to the handles of the brad squeezer, it pulls in the smooth rod AB. Determine the force P exerted on each of the smooth brads at C and D

    media%2F760%2F7609e26d-7481-4d34-b4f6-eb8d308bd379%2FphpsT6miC.png

    2. Relevant equations
    ##\sum F_x=0##
    ##\sum M=0##
    ##\sum F_y=0##

    3. The attempt at a solution
    I drew a free body diagram of Members EA with the initial force applied. Since A and B are two force members, ##F_{AB}## is drawn opposite direction in free body diagram BCD. However when I solve the the equations I get that P is opposite to the Free body diagram drawn. Why is that is there some mistake?


    Moments about ##E## yields ##M_E=2\cdot 2-F_{AB}=0## so ##F_{AB}=4##
    In second FBD, I get that ##P=-2##there must be some mistake in this?
     

    Attached Files:

  2. jcsd
  3. Jul 12, 2015 #2
    Wow, I thought I was the only one who ever used English/Imperial units any more.

    The sum of the torques about a given axis must be zero.

    Taks care, and carry your units along.
     
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