How to Give Examples of Periodic Motion
Periodic motion is prevalent in nature and man-made inventions. Periodic motion occurs when an object repeats its motion in equal amounts of time. Pendulums exhibit this type of motion, as do objects bouncing on the end of a spring. The time required to complete a cycle of motion -- that is, to start and end at the same point -- is defined as the period and is denoted by the letter "T." The frequency of the motion is the reciprocal of the period.