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Direction of rotation of moment

  1. Sep 23, 2015 #1
    1. The problem statement, all variables and given/known data
    IMO , the M2 and M1 should rotate clockwise, and the moment should point downwards based on right hand grip rule . Why the book gave in in other way ?

    2. Relevant equations


    3. The attempt at a solution
     

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  3. Sep 24, 2015 #2

    haruspex

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    I don't think you are supposed to take the arrow directions as accurate. They are merely indicating which entities are forces and which are couples.
     
  4. Sep 24, 2015 #3
    you mean the author just simply give the direction of moment ?
     
  5. Sep 24, 2015 #4

    haruspex

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    No, I'm saying that the author did not care about being consistent. It was not relevant to the point being made.
     
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