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A harmonic vibration is produced when a particle oscillates around a point of equilibrium, so that its velocity is maximum when it passes through the point of equilibrium and nil at the ends of the oscillation.
In all harmonic vibrations the following magnitudes are important:
| Elongation |
The distance to the point of equilibrium |
| Amplitude |
The maximum value of the elongation |
| Period |
The time taken by the particle to complete an oscillation |
| Frequency |
The number of oscillations per unit of time. Its value is always the inverse of the period. |
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