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Homework Help: Equipollent System of Bars and Pivots

  1. Nov 22, 2008 #1
    1. The problem statement, all variables and given/known data
    There are three connected bars (Bar 1, 2, and 3). Bar 1 is attached at on end to a pivot, point A, where it can rotate and at the other end to Bar 2, point B. Bar 2 is connected to Bar 1 at point B where it is free to rotate and translate. Bar 2 is connected at the opposing end to Bar 3, point C. Bar 3 can only translate horizontally. If there is a known horizontal force and displacement of Bar 3, what is the moment at point A so that the system is in equilibrium?

    2. Relevant equations
    M = F*rprep
    M1 = M2 :. F1*rperp = F2*rprep

    3. The attempt at a solution
    The force at point A would be the known horizontal force on Bar 3 * rprep from point 3 to point 1. Right? This would be true regardless of the angle of Bar 2 correct?
  2. jcsd
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