Velocity vs Average Velocity
Veocity yog ib qho cuab yeej tseem ceeb uas tau tham hauv qab ntawm kev siv tshuab hauv physics. Kev nrawm ntawm ib qho khoom piav qhia tias qhov khoom txav nrawm npaum li cas thiab qhov kev taw qhia ntawm nws txoj kev txav mus los. Qhov nruab nrab tshaj tawm piav qhia tag nrho cov kev nrawm nrawm ntawm kev txav. Ob lub ntsiab lus no yog qhov yooj yim thiab tseem ceeb heev hauv yuav luag txhua ceg ntawm physics. Nyob rau hauv tsab xov xwm no, peb yuav tham txog dab tsi ceev thiab qhov nruab nrab tshaj tawm yog, cov ntsiab lus ntawm kev tshaj tawm thiab nruab nrab tshaj tawm, lawv qhov zoo sib xws thiab thaum kawg qhov txawv ntawm qhov nrawm thiab qhov nruab nrab tshaj tawm.
Kev nrawm
Veocity yog lub cev muaj nuj nqis 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 ntawm kev tshaj tawm ib leeg hu ua modulus of velocity. Qhov no yog sib npaug rau qhov ceev ntawm qhov khoom. Qhov nruab nrab tshaj tawm ntawm ib yam khoom yog qhov sib txawv ntawm qhov kawg thiab qhov pib tshaj tawm (sib cais hauv peb qhov ntev) muab faib los ntawm tag nrho lub sijhawm. Qhov ceev ntawm ib yam khoom yog ncaj qha ntsig txog lub zog kinetic ntawm cov khoom. Nyob rau hauv classical mechanics, lub zog kinetic ntawm ib yam khoom yog ib nrab ntawm cov huab hwm coj multiplied by velocity squared (Ek=½ mv2). 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 pauv ntawm lub sijhawm sib koom ua ke ntawm qhov khoom.
Nruab Nrab Velocity
Nruab nrab tshaj tawm yog qhov nruab nrab ntawm qhov nrawm nrawm dhau ib lub sijhawm. Txij li qhov no nyuaj kom tau txais, ib txoj hauv kev yooj yim dua 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 yields qhov kev ncua deb 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 sib txawv ntawm Velocity thiab Nruab Nrab Velocity yog dab tsi?
• Kev nrawm ntawm ib qho khoom yog ib qho khoom tam sim ntawd rau ib qho kev taw qhia uas qhov nruab nrab tshaj tawm ib txwm sib haum mus rau tag nrho cov lus tsa suab ntawm ob lub ntsiab lus.
• Ib yam khoom muaj peev xwm muaj tus nqi tshaj tawm thaum qhov kev hloov pauv yog xoom, txawm li cas los xij, qhov nruab nrab tshaj tawm ntawm txhua yam khoom nrog xoom xaim kuj yog xoom.
• Lub vector ntawm kev tshaj tawm nyob rau hauv qhov kev taw qhia tam sim ntawm cov khoom. Cov kev taw qhia ntawm qhov nruab nrab tshaj tawm yog nyob ntawm qhov chaw pib thiab qhov kev txav ntawm qhov khoom. Ib txwm, qhov nruab nrab nrawm vector yog sib npaug rau qhov hloov pauv vector.
