The main objective of a hasic mechanics course should he to develop in the engineering student the ahility to analyze a given problem in a simple and logical manner and to apply to its solution a few fundamental and well-understood principies. This text is designed for the first course in mechanics of materials -or strength of materials- offered to engineering students in the sophomore or junior ycar. The authors hope that it wil1 help inslructors achieve this goal in that particular course in the same way that their other texts mas Nave helped them in statics and dynamics.