Vibration is the term given to an oscillatory motion involving an object moving back and forth. During this motion the object starts from rest at a position of maximum displacement, begins to accelerate towards the equilibrium position from which it has been displaced, overshoots at maximum velocity and begins to decelerate due to a restraining force, until it comes to rest at maximum displacement in the opposite direction. The process is then repeated. At the equilibrium position, where displacement = 0: velocity is greatest and acceleration is zero. Whereas, at maximum displacement: velocity is zero and acceleration is at its greatest.
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