関連ワード:  define motion class 9 with example    what is motion class 9 with example    define uniform motion class 9 with example    define circular motion class 9 with example    define brownian motion class 9 with example    define linear motion class 9 with example    define uniform circular motion class 9 with example    define non uniform motion class 9 with example    define inertia of motion class 9 with example    define rest and motion class 9 with example