(i) PERIODIC MOTION: When a body or a moving particle repeats its motion along a definite path after regular parts of time, its rotation is said to be Periodic Motion and interval of time is called periodic time or harmonic motion period (T). The path of periodic motion can be simple, circular, elliptical or any other curve.
(ii) OSCILLATORY MOTION: 'To and Fro' type of motion is called an Oscillatory Motion. It required not be periodic and required not have fixed extreme positions.
The force/torque acting in oscillatory motion (directed towards equilibrium point) is called restoring force/torque.
(iii) EQUATION OF SIMPLE HARMONIC MOTION (SHM): The necessary and sufficient condition for a SHM
F = -kx
where k = Force constant for a SHM,
x = displacement from mean position.
or
![787_types of motion1.png](https://www.expertsmind.com/../CMSImages/787_types of motion1.png)
It's solution is
With the change of time t, sin(ωt + f) varies between 1 and -1 and corresponding displacement x varies between A and -A. Thus the range of vibration is 2A. The term (ωt + f) represents phase of the particle at any instant t. Here ω is angular velocity i.e. the rate of change of phase angle of the particle with time and Φ is called phase constant or initial phase, the value of Φ depends upon initial conditions. If the time is recorded from the instant when x is zero and with increase in t, x is increasing then x = A sinωt
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