The content of the Mechanics I textbook includes methods for determining stresses and strains in uniaxial members, column buckling loads, and a discussion of material properties and material behavior.? Because we have included three topics not normally found in traditional Statics books, we have added the three plus signs to the subtitle Statics +++.? ? We introduced the concept of stresses in uniaxial members, because an analysis of the forces in some structural element is incomplete.? Determining the force is not sufficient to establish the safety of the structural member or to design its cross section.? However, it is easy to introduce stresses in uniaxial members s = P/A, and we have taken this important step toward a more complete analysis.? Next, we added a chapter on materials and material properties introducing yield and ultimate tensile strength.? Determining the stress and comparing this value with the strength of an engineering material enables the student to establish the safety factor or the margin of safety of the structural element.? We have found that extending the analysis to incorporate s