This document provides an introduction to circular motion concepts including: 1. It describes uniform circular motion and compares two situations that have the same speed but different velocities. 2. Key equations are introduced relating the speed of an object moving in a circle to its radius, time period, and angular frequency. 3. The radian is defined as the angle subtended at the center of a circle by an arc equal in length to the circle's radius. Conversions between degrees and radians are discussed.