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Direction of moment

  1. Sep 23, 2015 #1
    1. The problem statement, all variables and given/known data
    IMO, the direction of moment of both F1 and F2 should point inside the paper , and rotate clockwise , am i right ? but the book gave different things... which is correct?

    2. Relevant equations


    3. The attempt at a solution
     

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  3. Sep 25, 2015 #2

    Simon Bridge

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    Please describe how you arrived at your answer.
    Note, the images you provide do not appear to have F1 or F2 on them... fig 3.26a has some forces and a moment, it that what you mean?
     
  4. Sep 26, 2015 #3
    there are f1 anf f2 in diagram 3.26a and 3.26b .... sinnce the moment = r X F... so, by right hand rule , the thumb( direction of moment )_ point into the paper...and the moment should be in clockwise direction... am i right ?
     
  5. Sep 26, 2015 #4
    It's an optical illusion. You're seeing r1 and r2 coming out of the page. They can also be going into the page.
     
  6. Sep 27, 2015 #5

    Simon Bridge

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    Make sure you have the 3d drawing convention for thr book right.
     
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