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Direction of moment forces

  1. Nov 26, 2007 #1
    1. The problem statement, all variables and given/known data

    How do u find whether the moment is negative or positive in the three examples shown?? Even if you use the right hand rule, for case 2 i have seen that the moment is negative and not positive. I am taking counter clockwise as positive moments. Please help out. Thanks!

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Nov 26, 2007 #2


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    If you take ccw as positive, then the moment vector points out of the page toward you, using the right hand rule, in the positive Z direction. It follows that cw moments are then negative, pointing in the negative Z direction into the page away from you. So the first 2 moments, being cw are negative, and the last, being ccw, is positive, per your chosen convention.
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