Question

E.g of periodic& non-periodic changes

Answer 1

Examples of periodic motion:
1. The motion of the bob of the simple pendulum
2. Motion of a planet around the sun
3. Motion of the tip of the minute and hour hands of a clock
4. Motion of a boy sitting in a swing
5. Motion of the needle of a sewing machine operating at constant speed

Examples of non-periodic motion:
1. Swaying of the branches of a tree
2. Motion of a bouncing ball under the action of gravity and friction
3. The running of a batsman between the wickets
4. Motion of the pestle in a mortar when operated manually.

Answer 2

certain things that occur after the same interval of time continously after each happening is called periodic changes.
changes that occur uncertainly without any specific time period between their happenings is called non periodic changes.