This book investigates the forces exerted by fluid flow on immersed bodies, focusing on the principles of lift and drag. It examines external flow, where a boundary layer develops and interacts with an outer flow region, and details how pressure and shear forces acting on a body's surface combine to create resultant forces. The primary objective is to understand the drag force, which opposes motion, and the lift force, which acts perpendicular to the flow direction, as crucial elements in fluid dynamics.

The book focuses on fundamental principles of fluid mechanics, specifically external flow and its associated forces. The detailed explanation of lift and drag suggests a text aimed at engineering or physics students seeking a thorough understanding of these aerodynamic concepts. Its approach emphasizes the practical application of fluid dynamics in analyzing the forces acting on objects within a fluid medium.