Simple Harmonic Motion vs Periodic Motion
Cov lus tsa suab ib ntus thiab kev sib haum xeeb yooj yim yog ob hom kev taw qhia tseem ceeb hauv kev kawm txog physics. Ib qho yooj yim harmonic tsab ntawv tsa suab yog ib qho qauv zoo kom nkag siab txog cov lus tsa suab nyuaj. Kab lus no yuav piav qhia seb qhov kev txav mus los ntev npaum li cas thiab kev sib haum xeeb yooj yim yog, lawv cov ntawv thov, qhov sib xws thiab thaum kawg lawv qhov sib txawv.
Nyob rau lub sijhawm
Ib ntu ntu tuaj yeem suav tau tias yog ib qho lus tsa suab uas rov ua nws tus kheej hauv lub sijhawm teem tseg. Lub ntiaj teb revolving ib ncig ntawm lub hnub yog ib tug periodic motion. Lub satellite orbiting nyob ib ncig ntawm lub ntiaj teb yog ib tug periodic motion txawm lub suab ntawm ib tug tshuav pob teeb yog ib tug periodic motion. Feem ntau ntawm cov sij hawm uas peb ntsib yog ncig los yog ib nrab voj voog. Ib qho kev txav mus los muaj ntau zaus. Qhov zaus txhais tau tias yuav ua li cas "frequent" tshwm sim. Rau qhov yooj yim, peb siv zaus raws li qhov tshwm sim ib ob. Cov lus tsa suab ib ntus tuaj yeem ua ib yam lossis tsis sib xws. Ib qho kev txav txav tsis sib xws tuaj yeem muaj qhov sib txawv ntawm qhov nrawm. Cov haujlwm xws li amplitude modulation tuaj yeem muaj ob lub sijhawm. Lawv yog cov haujlwm ua ntu zus nyob rau hauv lwm cov haujlwm raws sijhawm. Qhov kev hloov pauv ntawm qhov zaus ntawm lub sijhawm ua haujlwm muab lub sijhawm rau ib lub sijhawm. Tej yam yooj yim harmonic motions thiab damped harmonic motions kuj yog periodic motions.
Simple Harmonic Motion
Qhov yooj yim harmonic motion yog txhais raws li ib tug motion noj daim ntawv ntawm a=– (ω2) x, qhov "a" yog acceleration thiab "x" yog qhov kev hloov pauv los ntawm qhov sib npaug. Lo lus ω yog qhov tsis tu ncua. Ib qho yooj yim harmonic motion yuav tsum muaj ib tug restoration quab yuam. Lub zog rov qab tuaj yeem yog lub caij nplooj ntoos hlav, lub zog nqus, lub zog sib nqus lossis lub zog hluav taws xob. Ib qho yooj yim harmonic oscillation yuav tsis emit ib lub zog. Tag nrho cov tshuab hluav taws xob ntawm qhov system tau txuag. Yog hais tias kev txuag tsis siv, lub kaw lus yuav yog ib qho damped harmonic system. Muaj ntau yam tseem ceeb ntawm kev siv yooj yim harmonic oscillations. Lub moos pendulum yog ib qho zoo tshaj plaws yooj yim harmonic systems muaj. Nws tuaj yeem pom tau tias lub sijhawm oscillation tsis nyob ntawm qhov loj ntawm lub pendulum. Yog hais tias lwm yam xws li huab cua tsis kam cuam tshuam rau kev txav, nws yuav nws thiaj li ntub dej thiab yuav nres. Qhov xwm txheej tiag tiag hauv lub neej yeej ib txwm muaj kev cuam tshuam oscillation. Lub caij nplooj ntoo hlav loj kuj yog ib qho piv txwv zoo rau qhov yooj yim harmonic oscillation. Lub zog tsim los ntawm elasticity ntawm lub caij nplooj ntoos hlav ua raws li lub zog rov qab los hauv qhov xwm txheej no. Txoj kev sib haum xeeb yooj yim kuj tuaj yeem ua raws li qhov projection ntawm lub voj voog ncig nrog qhov nrawm nrawm. Ntawm qhov sib npaug ntawm qhov sib npaug, lub zog kinetic ntawm lub cev ua qhov siab tshaj plaws, thiab thaum lub sijhawm tig, lub zog muaj peev xwm dhau los ua siab tshaj plaws thiab lub zog kinetic dhau los ua xoom.
Qhov txawv ntawm Periodic Motion thiab Simple Harmonic Motion yog dab tsi?
• Kev sib haum xeeb yooj yim yog qhov tshwj xeeb ntawm kev txav mus los.
• Cov lus tsa suab sib haum xeeb yooj yim yuav tsum muaj lub zog rov qab los, tab sis tuaj yeem ua ntu ntu ntu, yam tsis muaj zog rov qab.
• Ib qho yooj yim harmonic motion txuag nws tag nrho cov neeg kho tshuab zog, tab sis ib lub sij hawm tsis tas yuav tsum ua li ntawd.
