Statics forces acting on supports

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The discussion revolves around solving a statics problem involving forces acting on supports. The user has identified four forces and established an equation for vertical forces, Ay + By = 3036 lb/ft. They express the need for a second equation to solve for Ay and By, indicating uncertainty about incorporating moment forces. A response suggests that instead of a "moment force," the user should take moments of the existing forces about a chosen point and set the sum to zero. The conversation emphasizes the importance of using equilibrium equations to solve for unknowns in statics problems.
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Homework Statement


see attachement


Homework Equations


sum of Fx=0
sum of Fy=0
sum of M=0


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.
 

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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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