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I Isn't the force calculated twice?

  1. Oct 17, 2016 #1
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    Isn't the force calculated twice here? For example, the force along AB is at first calculated for the resultant force along OB, then for the resultant force along AC.
    I think the compression and tensile stress should be ##\frac{F}{2a}##.
     
  2. jcsd
  3. Oct 18, 2016 #2

    haruspex

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    Forget that it is a solid block for the moment and think of it as a framework of rods. The vertex A is subject to tension F along AB and tension F along AD. The resultant is a force F√2 along AO.
     
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