Distinguish between damped vibration and forced vibration
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Damped vibration is the type of vibration that occurs when an object is subjected to a resistive force, such as friction or air resistance. In damped vibration, the amplitude of the oscillation decreases over time, eventually reaching zero. This type of vibration is called “damped” because the energy of the oscillation is dissipated, or absorbed, by the resistive force.
Forced vibration is the type of vibration that occurs when an object is subjected to an external periodic force, such as a driving force or a forcing function. In forced vibration, the amplitude of the oscillation can be constant, increasing, or decreasing, depending on the characteristics of the external force and the object’s response to it. This type of vibration is called “forced” because it is driven by an external force, rather than by the object’s own elasticity.x