$1$ Method of Sections

The given truss members have equal lengths. Assume that the force at B$,$ E$,$ and D has the magnitude of $F_B=10kN,F_E=20kN,$ and $F_D=30kN,$ respectively.

$($a$)$ Draw a free$-$body diagram for the truss.

$($b$)$ Use the diagram to calculate the reaction forces at A and C$.$

$($c$)$ Use the method of sections to compute the forces in the members of the truss AB$,$ BE$,$ and ED$.$

$($d$)$ Identify which force in the members of the truss is a compression or a tension.