Chapter17Oscillations17-1OscillatingSystemsEachdayweencountermanykindsofoscillatorymotion,suchasswingingpendulumofaclock,apersonbouncingonatrampoline,avibratingguitarstring,andamassonaspring.Theyhavecommonproperties:1.Theparticleoscillatesbackandforthaboutaequilibriumposition.Thetimenecessaryforonecompletecycle(acompleterepetitionofthemotion)iscalledtheperiodT.2.Nomatterwhatthedirectionofthedisplacement,theforcealwaysactsinadirectiontorestorethesystemtoitsequilibriumposition.Suchaforceiscalleda“restoringforce(恢复力)”.3.Thenumberofcyclesperunittimeiscalledthe“frequency”f.(17-1)Unit:period(s)frequency(Hz,SIunit),1Hz=1cycle/sTf1=4.Themagnitudeofthemaxim...
