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Why does a moment have more than one part?

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Homework Statement



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?

Homework Equations






The Attempt at a Solution



I think that the sum of the two moments makes the net moment.
 

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  • #2
SteamKing
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Homework Statement



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?

Homework Equations






The Attempt at a Solution



I think that the sum of the two moments makes the net moment.
It's not clear what you mean when you say a moment has 2 parts. Could you specifically point out these parts?
 
  • #3
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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?
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.
Thanks
 
  • #4
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The 80 N force is decomposed into two vectors and moments of both vectors are added, it makes calculations easier.
 
  • #5
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The 80 N force is decomposed into two vectors and moments of both vectors are added, it makes calculations easier.
That is more or less what I figured, but I wanted to make sure. Thank you.
 

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