Focusing on fluid film, hydrodynamic, and elastohydrodynamic lubrication, Hamrock (professor emeritus, Department of Mechanical Engineering, Ohio State University) examines the most important principles of fluid film lubrication for the correct design of bearings, gears, and rolling operations and the prevention of friction and wear in engineering designs, in this text for senior undergraduate and graduate engineering students. Early chapters cover fundamentals required to understand fluid film lubrication, while later chapters cover hydrodynamic and elastohydrodynamic lubrication. Emphasis is given to deriving formulas from basic theory and providing physical understanding of these formulas. This second edition incorporates developments in the field since the first edition was published about ten years ago, and includes chapter symbol lists, more worked examples, and more problems