Engineering Statics


Determine the force in members FG and FH of the truss shown.

A FBD of the truss is drawn in order to solve for external forces.

B<sub>x</sub> is zero because no other external forces exist in the 
The truss has been cut vertically through members EG, FG and FH. 
FBD's of both sides have been drawn.
From the right FBD, FG is the only member with a vertical component, hence 
it is the only unknown in the y equilibrium equation.
A moment about G allows us to solve for the other unknown, FH.