Periodic Motion:
Any motion which repeats itself after regular interval of time is called
periodic or harmonic motion. Motion of hands of a clock, motion of earth around
the sun, motion of the needle of a sewing machine are the examples of periodic
motion.
Oscillatory Motion:
If a particle repeats its motion after a regular time interval about a fixed
point, motion is said to be oscillatory or vibratory. i.e. oscillatory motion
of piston in an automobile engine, motion of balance wheel of a watch are the
example of oscillatory motion.
Time period: Time
taken in one complete oscillation is called time period.
Or, Time after which motion is repeated is called time
period.
Frequency = Frequency is the no. of oscillations completed by
oscillating body in unit time interval. Its Si unit is Hertz.
If n = Frequency, T= time period, then nT = 1
Simple Harmonic
Motion: if a particle repeats its motion about a fixed point after a
regular time interval in such a way that at any moment the acceleration of the
particle is directly proportional to its displacement from the fixed point at
that moment and is always directed towards the fixed point then the motion of
the particle is called simple harmonic motion.
The fixed point is called mean point or equilibrium point.
Characteristics of
SHM
