Question

a student makes a list of different types of movements he sees around him . which of these motions can be classified as periodic motion (a) car moving on a straight road (b)a falling pencil (c) rotating blades of a fan (d) motion of a child on a swing ​

Answer 1

(d) motion of a child on a swing is periodic motion

Motion which repeats itself after certain intervals is called periodic motion. Since the motion of a swing also repeats after regular intervals so, the motion of child on a swing is periodic.