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# Difference between Periodic, Oscillation and Simple Harmonic Motion

### Periodic Motion

• A motion repeats itself after an equal interval of time. For example, uniform circular motion.
• There is no equilibrium position.
• There is no restoring force.
• There is no stable equilibrium position.

### Oscillation Motion

• To and fro motion of a particle about a mean position is called an oscillatory motion in which a particle moves on either side of equilibrium (or) mean position is an oscillatory motion.
• It is a kind of periodic motion bounded between two extreme points. For example, Oscillation of Simple Pendulum, Spring-Mass System.
• The object will keep on moving between two extreme points about a fixed point is called mean position (or) equilibrium position along any path. (the path is not a constraint).
• There will be a restoring force directed towards equilibrium position (or) mean position.
• In an oscillatory motion, the net force on the particle is zero at the mean position.
• The mean position is a stable equilibrium position.

### Simple Harmonic Motion or SHM

• It is a special case of oscillation along with straight line between the two extreme points (the path of SHM is a constraint).
• Path of the object needs to be a straight line.
• There will be a restoring force directed towards equilibrium position (or) mean position.
• Mean position in Simple harmonic motion is a stable equilibrium.