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This lecture covers the concepts of drag, momentum, impulse, and center of mass. It explains resistive forces, laminar and turbulent viscous drag, momentum conservation, and the calculation of the center of mass for discrete and continuous systems. The instructor discusses the application of forces at the center of mass, impulse approximation, and the kinematics of the center of mass, emphasizing the separation of internal and external forces. Various conceptual questions and demonstrations are used to illustrate these physical principles.