So in this introduction we are going to focus on some of the basic variables used to describe circular motion and momentum, and leave details about the conservation laws to later in the chapter. When ...So in this introduction we are going to focus on some of the basic variables used to describe circular motion and momentum, and leave details about the conservation laws to later in the chapter. When we say "the wheel is moving at an angular speed of 1 rotation a minute", that applies to the entire object - specifically, points A and B (which is halfway out to the edge) have the same angular speed (why?).