This document discusses centripetal acceleration and centripetal force. It defines centripetal acceleration as acceleration toward the center of a circular path caused by changing velocity. An equation is given for centripetal acceleration using angular velocity and radius. It also defines centripetal force as the force causing an object to travel in a circular path, and gives an equation for centripetal force using mass, velocity, and radius. Examples are provided to demonstrate calculating speed, acceleration, and force for objects moving in circular motion.