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Trusses (forces)

  1. Jul 3, 2016 #1
    1.)
    from the calculation of F(AD), the force should point towards A,right? (red arrow)
    but, in the calculation of F(AB), the (1/sqrt rt2)(48.08) should be positive,right? (which is pointing towards LEFT)???
    qBa9kzc.jpg
    2BI6nCl.jpg
    2. Relevant equations



    3. The attempt at a solution
    this involve the resolution of forces into vertical and horizontal axes,am i right?
     
  2. jcsd
  3. Jul 3, 2016 #2

    billy_joule

    User Avatar
    Science Advisor

    Positive X is rightward, as the equation HA -28 = 0 defined at the start of the solution.
    Member AD was found to be in compression and so exerts a leftward force at joint A, so the term 1/(√2)(48.08) is negative.
     
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