Outline
Mechanical waves, such as sound and seismic waves, transfer energy through a physical medium.
The natural frequency is the rate at which an object vibrates when it is disturbed by an outside force.
A forced vibration occurs when a wave forces an object to vibrate at the same frequency as the wave.
Resonance is the large-amplitude vibration that occurs in the object when the forced vibration is the same as its natural frequency.
Tacoma Narrows Bridge Collapse "Galloping Gertie"
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