Explore the principles of collisions in two dimensions in this 23-minute physics lesson. Learn how to apply conservation of momentum in both x- and y-components for 2D collision problems. Understand the difference between elastic and inelastic collisions, and practice solving problems involving both types. Follow along as the instructor demonstrates how to set up and solve equations for inelastic collisions where objects stick together after impact, as well as elastic collisions involving glancing impacts. Master techniques for calculating final velocities, magnitudes, and directions in various 2D collision scenarios.