Vibration of vibration are pulling a child back on a swing and letting it go, or hitting a tuning fork and letting it ring. The mechanical system vibrates at one or more of its natural frequencies and damps down to motionlessness. Forced vibration is when a time-varying disturbance (load, displacement or velocity) is applied to a mechanical system. The disturbance can be a periodic and steady-state input, a transient input, or a random input. The periodic input can be a harmonic or a non-harmonic disturbance. Examples of these types of vibration include a washing machine shaking due to an imbalance, transportation
Oh Dear! What Can the Matter Be? me a twopenny whistle He'll buy me a threepenny fair He'll buy me a Bunch o' Blue Ribbons To tye up my bonny Brown Hair O saw ye him coming And saw ye him coming O saw ye him coming Hame frae the Newcastle fair </poem> The following are given as the traditional lyrics (being chorus and verse) in Cuddon's and Preston's "A Dictionary of Literary Terms and Literary Theory": <poem> O dear, what can the matter be? Dear, dear, what can the matter be? O dear, what can the matter be? Johnny's so long at the fair. He promised