Tag Archives: free-body diagram
Statics 3.1 – Equilibrium of Truss Members in Pin Connection | Hibbeler 14th Edition
The members of a truss are pin connected at joint O. Determine the magnitudes of F1 and F2 for equilibrium. Set θ=60.

Solution:
Free-body diagram:

Equations of Equilibrium:
Take the sum of horizontal forces considering forces to the right positive, and equate to zero.
Take the sum of vertical forces considering upward forces positive, and equate to zero.
Now, we have two equations with two unknowns and . So, we have a system of two equations. We can solve this using algebra, or we can directly use our calculator with this capability. The answers are
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