A concise, updated successor to the successful "Mechanics of Materials" by Higdon, Olsen, Stiles, Weese, and Riley, this text is designed for a first course in mechanics of deformable bodies. It presents the concepts and skills that form the foundation of all structural analysis and machine design. The presentation relies on free-body diagrams, application of the equations of equilibrium, visualization and use of the geometry of the deformed body, and use of the relations between stresses and strains for the material being used. Stress transformation is covered later in this book than in the Higdon text. There are many illustrative examples and homework problems as well as computer problems and an appendix on computer methods.