Physics (NTSE/Olympiad)  

5. Sound

Oscillatory Motion

(i) If a body in periodic motion moves along the same path to and fro about a definite point (equilibrium position), then the motion of the body is a vibratory motion or oscillatory motion
Note: Resultant force acting on the particle is zero in equilibrium condition.
(ii)It is to be noted here that every oscillatory motion is periodic but every periodic motion is not oscillatory

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