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How does the force get cancel out?

  1. Apr 17, 2013 #1
    1. The problem statement, all variables and given/known data

    How does the force get cancel out?

    2. Relevant equations



    3. The attempt at a solution

    Please see the picture.
    I dont understand why is F1 not included in the system ?
    F1 just looks the same as F4, but F4 is included in the calculation.
    Someone told me the horizontal vector and vertical vector somehow cancel out each other but i dont quite get it..
     

    Attached Files:

    • OO.png
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  2. jcsd
  3. Apr 17, 2013 #2

    rock.freak667

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    Homework Helper

    What exactly does the calculation involve?
     
  4. Apr 17, 2013 #3
    solved the problem!
     
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