A mechanical system is said to be vibrating when its component parts are undergoing periodic (that is cyclically repeated) oscillations about a central configuration (usually the statical equilibrium position). It can be shown that any system, by virtue of its inherent mass and elasticity, can be caused to vibrate by externally applied forces. The duration and severity of the vibration will depend on the relation between the external forces and the mechanics of the system, and will be discussed later.
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