Newton's 2nd Law and Surface Terms

This lecture covers Newton's 2nd Law, focusing on the forces and stresses involved in different scenarios. It delves into the concept of surface forces, viscous stress, and tensor analysis. The presentation progresses to discuss the application of these principles in solving diffusion and flow problems, emphasizing the importance of boundary conditions. Special attention is given to the challenges posed by the Navier-Stokes equations and the strategies to address them, including analytical and numerical methods.