Is the Strut a Two Force Member? Why is Only One Force Used in Calculations?

AI Thread Summary
The discussion centers on the classification of a strut as a two-force member and the reasoning behind using only one force in calculations. It highlights that while the strut does experience an equal and opposite force at point B, this force is considered internal and not included in the free body diagram for the entire system. The focus remains on the external forces acting on the system, which justifies the use of only the force at point A in calculations. The clarification emphasizes the distinction between internal and external forces in structural analysis. Understanding this concept is crucial for accurately analyzing two-force members in engineering problems.
xzibition8612
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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.
 

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hi xzibition8612! :smile:
xzibition8612 said:
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?

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:
 
damn your smart
 

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