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Elongation (y): is the distance from the moving body to the
origin (O) of the movement at every instant.
Amplitude (A): is
the maximum elongation it achieves.
Period (T): is
the time it takes to finish one complete vibration.
| Frequency
(f): the number of complete vibrations per unit of
time: |
 |
Phase difference , initial phase or phase
angle
(φ): its value determines the position of a body at the initial
instant.
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