I. True or False. Write TRUE if the statement is correct and FALSE if the statement is incorrect. 1. Stress is pressure exerted on a material object; it may have a unit of kN. 2. Strain is force per unit area, and has no unit. 3. Stress is considered normal when the force is parallel to the cross section. 4. Stress is considered shear when the force is perpendicular to the cross section. 5. Normal stress is also called tangential stress.

The graphical method is a method of solving equations involving more than one variable using the Cartesian coordinate system. In civil engineering, the use of the graphical method is limited to the problems involving two variables. The graphical method h…