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Homework Help: Statics forces acting on supports

  1. Mar 4, 2009 #1
    1. The problem statement, all variables and given/known data
    see attachement


    2. Relevant equations
    sum of Fx=0
    sum of Fy=0
    sum of M=0


    3. The attempt at a solution
    There are 4 forces that I have found. 12W acting in the negative y direction at A. 3W acting in the negative direction acting 2 feet from pt B. A F acting in the positive y direction from point A and a F acting in the positive direction from point B.
    Ay+By-12W-3W=0.
    Ay+By=3036lb/ft

    Obviously I need a second equation to solve for Ay and By. I'm not sure what other forces I can sum up. I think somehow I want to incorporate a moment force but I don't know what it would be.
     

    Attached Files:

  2. jcsd
  3. Mar 4, 2009 #2
    ?????
     
  4. Mar 4, 2009 #3

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi jimbo71! :smile:

    I can't see your diagram yet, so I'm only guessing …

    but there's probably no "moment force" - you just choose a point, and take moments of all the ordinary forces about that point, and equate it to zero. :wink:
     
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