When and how do you use the method of sections for truss analysis?

The method of sections is used when forces in specific members are needed without analyzing the entire truss. Cut the truss through maximum three members including the one of interest, creating a free body diagram. Apply three equilibrium equations (sum Fx = 0, sum Fy = 0, sum M = 0) to solve for up to three unknown forces. Choose moment centers strategically to eliminate unknowns. This method is more efficient than method of joints for finding specific member forces.