Learn Periodic Motion, Oscillatory Motion, and Vibratory Motion with complete Class 11 Physics notes. Understand definitions, characteristics, differences, examples, equilibrium position, restoring force, time period, frequency, FAQs, MCQs, true/false questions, fill in the blanks, and exam-oriented questions in one comprehensive guide. Suitable for NCERT, CBSE, State Boards, and competitive exams - Physicskund  Periodic Motion A motion that repeats itself after equal intervals of time is called Periodic Motion . The interval after which the motion repeats is known as the time period . In periodic motion, the body returns to the same position and state of motion after every fixed interval of time. Periodic motion does not necessarily involve motion along the same path or about a fixed point. It may be circular, rotational, linear, or oscillatory. Therefore, the existence of an equilibrium position is not compulsory for periodic motion. Characteristics of Periodic Motion ...