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  • Periodic motion Motion which repeats itself after regular intervals of time
  • Oscillatory motion A body in oscillatory motion moves to and fro about its mean position in a fixed time interval.
  • Period (T): It is the interval of time after which a motion is repeated. Its unit is seconds (s).

  • Time period Time required for one complete oscillation
where, v Frequency
  • Frequency : Number of oscillations in one second. The unit is Hertz.
  • An oscillatory motion is said to be simple harmonic, when the displacement (x) of the particle from origin varies with time given as,


  • Displacement is sinusoidal function of time.
  • Displacement − A …

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