6.3 Collisions in 2 Dimensions | General Physics

Chad provides a thorough lesson on Collisions in 2-Dimensions. Building upon the foundation for solving problems involving Collisions in 1-Dimension from the previous lesson, he shows how the conservation of momentum must be split into x- and y-components in a 2-dimensional collision problem. This set up potentially adds one additional equation for solving collision problems, whether for elastic or inelastic collisions.

Chad moves on to solving a couple of 2-dimensional physics collision problems. The first involves an inelastic collision in 2-dimensions in which two balls are stuck together after a collision. He shows how to set up the conservation of momentum equations in the x-dimension and in the y-dimension and then how to solve for the magnitude and direction of the balls' final velocity. The second collision problem involves an elastic collision in 2-dimensions. For an elastic collision, not only is momentum conserved in the x- and y-dimensions, but kinetic energy is also conserved resulting in one additional equation. The elastic collision involves a glancing collision between a cue ball and a second stationary ball. Given the velocity (magnitude and direction) of one of the balls after the collision, Chad demonstrates how to solve for the velocity of the other.

00:00 Lesson Introduction
00:39 Conservation of Momentum in Collisions in 2-Dimensions
01:45 Collision Problem in 2D: A Perfectly Inelastic Collision
09:11 Collision Problem in 2D: An Elastic Collision

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