Resonance is when the periodic driving force matches the natural frequency, making the amplitude of the oscillations noticeably increase.
The lighter the damping in the system, the larger the amplitude becomes hence the statement above is only true for systems with little or no damping.
An example of resonance in context is when the Tacoma Narrows Bridge collapsed as the wind along the bridge span exerted a periodic driving force that matched the natural frequency of the bridge span, meaning its amplitude increased causing it to collapse.
applied frequency of periodic driving force = natural frequency
for an oscillating system experiencing little or no damping
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