Summary
Circular motion involves both constant speed and continuously changing direction, which requires a centripetal force directed toward the center. Essential relationships between angular and linear quantities—such as v = r ? and a_r = ?²r—allow for the analysis of systems ranging from wheels and centrifuges to planetary orbits and artificial gravity. Understanding these principles is crucial for applying Newton’s second law to rotating systems and for solving problems in both uniform and nonuniform circular motion.