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เนื้อหาย่อ : With the publication of the third edition, this book enters the third decade of its existence-this time with a co-author who used the book, first as an under- graduate student and then later for many years as a professor. The main thrust has not changed from that of its predecessors. We have strived to make this treatment careful and thorough without short changing or sneeking around important but challenging fundamentals. We have presented the theory in a mature manner that we have found for many years and for varied classes to be within the reach of sophomores.* The goal has been to get to a point wherein students know the theory well enough so as to solve problems from first prin- ciples. That is, we have tried to avoid presenting in a weak matrix of discus- sion, lists of procedures for solving various classes of problems and for which strings of examples are presented in a way to encourage the mapping of homework problems from the examples. In short, we have tried to avoid a "black box" approach whose main thrust is on methodology. We have found over the years that students will retain the material much better when learning stems from fundamentals to applications directly with a minimum of rote learning of recipes accompanied by excessive problem mapping. What is worse, we believe that students that "plug and chug," relying on the recipes while cramming for exams, do not mature analytically in mechanics as they should. Furthermore, we believe that well grounded theory in solids will give the student a more meaningful experience and grasp in later mechanics-based courses such as fluids, structures, machine design etc. The steps we have taken in this edition to help foster problem solving from first principles and to increase retention of basics are as follows: 1. At appropriate places, we have inserted "A Look Back" section that reviews the material covered in Statics, Dynamics, and Physics for pur- poses of continuity and to make for greater ease in dealing with new mate- rial that depends on these earlier studies. These sections are short and to the point. *Later, more will be said about sophomore coverage as well as possible use of this book.