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Homework Help: I need a little intuition my way regarding moments and direction of couples

  1. Oct 24, 2014 #1
    1. The problem statement, all variables and given/known data
    The assembly shown is used to control the tension T in a tape that passes around a frictionless spool at E. Collar C is welded to rods ABC and CDE. It can rotate about shaft FG but its motion along the shaft is prevented by a washer S. For the loading shown, determine (a) the tension T in the tape, (b) the reaction at C.

    2. Relevant equations
    In the solution manual it says the reactions are as follows, C = <Cx,Cy,Cz> and M=<0,My,Mz>
    Actually, C i kind of understand it, but not tally sure, and M i have no clue…

    3. The attempt at a solution
    I Just need help regarding the direction of the forces and couples.
    My understanding is that because there's a welded connection, the weld will provide support from moving the rods, therefore the reaction at C goes in the x,y and z directions. However, if theres a vertical downforce at the end of the rod ( 6 lb) wouldn't that cause a rotation about FG and therefore cause a couple in the z direction only???

    Attached Files:

  2. jcsd
  3. Oct 24, 2014 #2


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    2017 Award

    Staff: Mentor

    Don't forget the force from the rope. It goes in a different direction.
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