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Engineering Mechanics: Force couple

  1. Oct 23, 2014 #1
    1. The problem statement, all variables and given/known data
    Problem is:
    Replace the 150-N force with an equivalent force-couple system at A
    Since it is really hard to describe the scenario in words, attached is a link that shows the diagram of the question.
    http://www.chegg.com/homework-help/...orce-equivalent-force-couple-system--q3044348

    2. Relevant equations
    Cross Product and sum of forces

    3. The attempt at a solution
    So I have the feeling I screwed up somewhere. What I did was I first converted the force into its components, producing me with -150cos35j+150sin35k. Since one of the things that the question asked was for I just simply took -150cos35 and 150sin35. I then decided to find the D which yields me (-0.1m)i+(0.12m)j+(-0.2m)k. Since the moment is equal to FxD, I took the cross product of these two values to produce me a value of (14.25N m)i+(-8.6N m)j +(-12.29N m)k. I have the strange feeling it is wrong and I screwed up somewhere. Can anyone help me with the problem?
     
  2. jcsd
  3. Oct 24, 2014 #2

    SteamKing

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    Check the direction of the components of the force. Look at the coordinate axes to make sure the components are oriented in the correct sense.
     
  4. Oct 24, 2014 #3
    Ah I see now! Thanks!
     
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