Question

how are vibtatory and oscillatory motions are related to periodic motion?

Answer 1

Answer:

Any motion that repeats itself over and over again at regular intervals of time is called periodic motion. For example, the motion of planets around the sun. If a body moves back and forth repeatedly about its mean position, its motion is said to be oscillatory or vibratory or harmonic motion.

Explanation:

Answer 2

In periodic motion, repetition occurs in a definite Period.

Oscillation of a body is generally in a to and fro manner in a fixed plane but vibration can be in all directions.

oscillatory motiion is a periodic motion but vibratory motion need not be periodic

Oscillation is about a single body where as vibration is the result of collective oscillation of atoms