This lecture covers the calculation of the force needed to hold a nozzle in place by combining Bernoulli's equation with conservation laws to determine forces from fluid flow and pressure differences. It discusses the force produced by fluid flow through a nozzle, assuming specific pressure and velocity conditions, and explores the linear momentum equation for a control volume in the context of steady flow of an ideal incompressible fluid. The lecture emphasizes the relationship between momentum accumulation, net momentum flow, and net force on matter within the control volume.