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Homework Help: Mechanics, specifically Moment question

  1. Sep 26, 2010 #1
    1. The problem statement, all variables and given/known data
    scan0001.jpg

    Also, im not entirely sure what the question is exactly asking. Also, what does the line of action represent?

    2. Relevant equations

    M = Fx(Perpendicular distance) + Fy(Perpendicular distance)

    For couples:

    M=Fd

    3. The attempt at a solution

    i was thinking that i need to find the moment at D, but wouldn't the resultant force still be the same? except located at D? However, since this is a couple, would the moment be the same everywhere?
     
    Last edited: Sep 26, 2010
  2. jcsd
  3. Sep 26, 2010 #2
    A force located at D doesn't give a moment (in D).
    You shoud find a force located somewhere else than D.

    A hint: the text speaks about LINE of action. Why ?
     
  4. Sep 26, 2010 #3
    Wouldnt the force anywhere still be 48 N since the couple cancels each other out, and leaves only the moment?

    Also, is the line of action just the direction/line that the force follows?
     
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