A VIBRATING SYSTEM RESONATES AT ITS OWN NATURAL FREQUENCY. THAT IS, THE AMPLITUDE OF THE STEADY-STATE RESPONSE IS GREATEST IN PROPORTION TO THE AMOUNT OF DRIVING FORCE WHEN THE DRIVING FORCE MATCHES THE NATURAL FREQUENCY OF VIBRATION.
EXAMPLE: AN OPERA SINGER BREAKING A WINEGLASS IN ORDER TO BREAK A WINEGLASS BY SINGING, AN OPERA SINGER MUST FIRST TAP THE GLASS TO FIND ITS NATURAL FREQUENCY OF VIBRATION, AND THEN SING THE SAME NOTE BACK.
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