Statics two force member

  • #1
xzibition8612
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Homework Statement



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Homework Equations





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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Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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hi xzibition8612! :smile:
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:
 
  • #3
xzibition8612
142
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damn your smart
 

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