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Method of Sections: Ignored Forces?

  1. Nov 10, 2013 #1
    methodlql.png

    In the above example, the method of sections is used to solve the truss. However, they do not consider the forces in other beams (the beams that are not being cut; e.g. AB, AH). Is this always the case with this method?
     
  2. jcsd
  3. Nov 10, 2013 #2

    mfb

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    There are no external forces coming from those beams.
     
  4. Nov 10, 2013 #3
    I understand but why are we not considering the internal forces eg force AH (like we are considering the internal force HG)
     
  5. Nov 11, 2013 #4

    mfb

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    HG is not an internal force in this part. That's the idea - split the whole constructions in smaller parts. Some splittings work, some do not, this is a working one.
     
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