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Homework Help: Shear Force/Moments

  1. Oct 15, 2012 #1
    1. The problem statement, all variables and given/known data
    The problem and the solution are in attached.

    2. Relevant equations

    3. The attempt at a solution

    What I'm confused about is the moment equation. Why does the equation reference both Ay and Ax, but it only considers the 3 kip force in one direction. Why doesn't it have an x-component, and a y-component?

    Attached Files:

  2. jcsd
  3. Oct 15, 2012 #2


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    Science Advisor
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    It does, Fx = 3 sin30 and Fy = 3 cos 30. When summing moments about B, however, it is easier to use the resultant force F in calculating the moment, rather than use the sum of its component moments to calculate the moment.
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