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Homework Help: Statics two force member

  1. May 31, 2012 #1
    1. The problem statement, all variables and given/known data

    see attachment

    2. Relevant equations

    3. The attempt at a solution
    The book says the strut is a two force member. Why then isn't there a equal but opposite direction force Fba at point B? Isn't that what a two force member means? Why for this two-force member only the force at point A is used in the calculations? Thanks.

    Attached Files:

  2. jcsd
  3. May 31, 2012 #2


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    Science Advisor
    Homework Helper

    hi xzibition8612! :smile:
    there is

    but the free body diagram is for the whole thing (bed contents and strut),

    so Fba is not used since it's an internal force :wink:
  4. Jun 1, 2012 #3
    damn your smart
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