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Homework Help: Why does a moment have more than one part?

  1. Sep 26, 2013 #1
    1. The problem statement, all variables and given/known data

    Question 1-4 from here http://www.eng.auburn.edu/~htippur/mech3130/hw-1-solutions-2012.pdf

    My question is why exactly does the moment have 2 parts from 1 force? Are those simply the components which together make up the net moment? Does each force always have 2 moments in opposite directions?

    2. Relevant equations

    3. The attempt at a solution

    I think that the sum of the two moments makes the net moment.
  2. jcsd
  3. Sep 26, 2013 #2


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    It's not clear what you mean when you say a moment has 2 parts. Could you specifically point out these parts?
  4. Sep 26, 2013 #3
    I guess I mean the components of the moment, aka -80sin45(0.1+0.3sin30) AND 80cos45(0.3cos30).

    I just want to make sure that thinking of them as components of the moment, and that their sum is the net moment, is correct.
  5. Sep 26, 2013 #4
    The 80 N force is decomposed into two vectors and moments of both vectors are added, it makes calculations easier.
  6. Sep 26, 2013 #5
    That is more or less what I figured, but I wanted to make sure. Thank you.
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