OscillationsOscillation are another type of periodic motion like circular motion where an object returns to the same point in space many times. If it is controlled and orderly, it is called simple harmonicHarmonic motion. If it is wild and uncontrolled it is called chaotic. PendulumsPendulum and masses on springsSpring are both examples of simple harmonicHarmonic motion that have important applications. Some of the themes of the chapter are represented in Figs. 6.1, 6.2 and 6.3.