Vibration is the oscillating or repetitive motion of an object around an equilibrium point.
It can be:
Free vibration – when an object vibrates after being disturbed (like a guitar string plucked once).
Forced vibration – when a continuous force causes the object to vibrate (like a speaker cone vibrating from electrical input).
Vibrations are described by:
Amplitude – how strong the vibration is.
Frequency – how fast it vibrates (measured in Hertz).
Damping – how quickly the vibration fades.
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