Example 3 (a) Calculate the forces in members CG and CF for the truss shown using the method of joints, (b) Calculate the forces in members CG and CF for the truss shown using the method of sections, and (c) If the 2-kN force acting on the truss were removed, identify the zero-force member(s). 2 kN 4 kN 2 m B 2m C 2 m D E 3 m