1. Nov 24, 2011 #1

   doubled

   

   The problem statement is "each of the four uniform links has a mass m. determine the horizontal force P required to hold them in place in the vertical plane as shown." I attached the solution, but I don't get when a force causes a +/- virtual work.

    

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   doubled, Nov 24, 2011
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3. Nov 24, 2011 #2

   TaxOnFear

   

   Erm, I'm not sure how work would come into this problem? What exactly are you asking?

    

   TaxOnFear, Nov 24, 2011

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