The core concepts of equilibrium, force-temperature-deformation behavior of materials, and geometry of deformation are central to a students understanding of mechanics of materials. The third edition of Roy Craigs Mechanics of Materials maintains its signature clear focus on these core concepts while showing students how to approach and solve problems with his four-step problem solving methodology. With newly revised and updated homework problems, this edition brings on an award-winning software program, MD Solids, to reinforce visualization using animations, tutorials, and examples. In addition, new chapter summary tables help readers check their understanding of key concepts and key equations to increase student retention.