Instantaneous vs Average Velocity
Veocity yog ib lub tswv yim tseem ceeb heev uas tau tham hauv cov tshuab. Ntau yam khoom ntawm ib yam khoom xws li lub zog kinetic thiab viscosity nyob ntawm qhov nrawm ntawm cov khoom. Lub tswv yim ntawm kev tshaj tawm yog dav siv hauv kev lag luam xws li kinetics, kinematics, dynamics, astrophysics thiab txawm tias engineering. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo ntawm cov ntsiab lus ntawm qhov nrawm nrawm thiab qhov nruab nrab nrawm kom ua tau zoo hauv cov haujlwm no. Nyob rau hauv tsab xov xwm no, peb yuav tham txog dab tsi instantaneous tshaj tawm thiab nruab nrab tshaj tawm yog, lawv qhov zoo sib xws, cov ntsiab lus ntawm instantaneous tshaj tawm thiab nruab nrab tshaj tawm thiab thaum kawg qhov txawv nruab nrab tshaj tawm thiab instantaneous tshaj tawm.
Kev nrawm nrawm yog dab tsi?
Ib tug yuav tsum nkag siab lub tswvyim ntawm kev tshaj tawm ua ntej, kom nkag siab lub tswvyim ntawm kev nrawm nrawm kom raug. Kev nrawm yog qhov ntau ntawm lub cev. Lub nrawm nrawm tuaj yeem muab tau raws li qhov nrawm nrawm ntawm cov khoom nrog cov kev taw qhia cov khoom txav mus rau lub sijhawm ntawd. Hauv Newtonian mechanics, qhov nrawm yog txhais raws li tus nqi ntawm kev hloov pauv. Ob qhov kev tshaj tawm thiab kev hloov pauv yog vectors. Lawv muaj tus nqi ntau thiab muaj kev taw qhia. Tus nqi ntau ib leeg ntawm kev tshaj tawm hu ua modulus of velocity. Qhov no yog sib npaug rau qhov ceev ntawm qhov khoom. Qhov ceev ntawm ib yam khoom yog ncaj qha ntsig txog lub zog kinetic ntawm cov khoom. Txoj kev xav ntawm kev sib raug zoo qhia tau hais tias muaj ntau dua version, uas tsis tau tham txog ntawm no. Txoj kev xav ntawm kev sib raug zoo kuj qhia tau hais tias qhov pom qhov loj ntawm ib yam khoom nce thaum qhov nrawm ntawm qhov khoom nce. Qhov nrawm ntawm ib qho khoom tsuas yog nyob ntawm qhov kev hloov ntawm qhov chaw-lub sij hawm ua haujlwm ntawm qhov khoom. Lub nrawm nrawm ntawm qhov khoom yog qhov kev ncua deb ntawm qhov khoom tau mus hauv lub sijhawm tsis kawg. Qhov no yog lej denoted li dx/dt qhov twg x yog tus hloov vector. Qhov nrawm nrawm tuaj yeem suav tias yog qhov nrawm uas qhov khoom xav tau tam sim ntawd. Lub sijhawm nrawm nrawm yog qhov ua haujlwm ntawm lub sijhawm. Rau ib yam khoom uas muab tso rau hauv ib lub zog net, lub nrawm nrawm ib txwm hloov. Rau ib qho khoom txav nrog qhov nrawm nrawm, qhov nrawm nrawm yog qhov tas mus li.
Qhov Nruab Nrab Velocity yog dab tsi?
Qhov nruab nrab qhov nrawm yog qhov nruab nrab ntawm qhov nrawm nrawm dhau lub sijhawm. Txij li qhov no yog qhov nyuaj kom tau txais, ib txoj hauv kev yooj yim yog siv los xam qhov nruab nrab tshaj tawm. Qhov nruab nrab tshaj tawm ntawm ib qho kev txav yog tag nrho qhov kev ncua deb ntawm cov khoom faib los ntawm lub sij hawm coj mus rau kev taug kev. Yog tias txoj kev ntawm cov khoom yog ib txoj kab ncaj nraim, ib qho vector rau qhov nruab nrab tshaj tawm tuaj yeem tau yooj yim. Lwm txoj hauv kev kom tau txais qhov nruab nrab tshaj tawm yog kev sib koom ua ke qhov nrawm nrawm nrog rau lub sijhawm rau kev taug kev. Qhov no ua rau qhov kev ncua deb mus los ntawm qhov khoom. Los ntawm kev faib cov khoom no los ntawm lub sijhawm coj mus los, qhov nruab nrab qhov nrawm tuaj yeem suav tau.
Qhov txawv ntawm Qhov Nruab Nrab Velocity thiab Instantaneous Velocity yog dab tsi?
• Rau ib qho kev taug kev, qhov nrawm nrawm yog lub sijhawm ua haujlwm, tab sis qhov nruab nrab nrawm yog qhov tas mus li.
• Lub vector ntawm qhov nruab nrab tshaj tawm yog ib txwm nyob ntawm qhov kev hloov pauv. Yog li ntawd, qhov nruab nrab tshaj tawm yog txoj kev ywj pheej, tab sis lub nrawm nrawm vector nyob ntawm txoj kev coj mus.
