Kev sib tw vs kwv tij Velocity
Veocity thiab txheeb ze tshaj tawm yog ob qho tib si ntsuas seb qhov khoom txav nrawm npaum li cas. Ob qhov nrawm thiab nrawm nrawm yog lub tswv yim tseem ceeb hauv cov haujlwm xws li engineering, mechanics, foob pob hluav taws kev tshawb fawb, kev sib txheeb thiab yuav luag txhua qhov chaw raws li physics thiab engineering muaj kev txhawj xeeb. Txhawm rau kom paub qhov nrawm thiab qhov txheeb ze tshaj qhov zoo dua peb yuav tsum muaj kev nkag siab zoo txog cov ncej. Ib lub thav duab yog ib qho kev sib koom ua ke uas tau hais los ua kom kev ntsuas tau yooj yim dua. Muaj ob hom thav ntawv, Inertial thav duab thiab tsis yog inertial thav duab. Inertial thav duab txhais tau tias yog cov thav ntawv uas nyob ntawm so lossis txav mus rau qhov nrawm nrawm. Non-inertial thav duab txav nyob rau hauv tsis tas li tshaj tawm (piv txwv li tsis yog-inertial thav duab nrawm). Muaj ntau hom kev sib koom tes, Cartesian coordinates, Spherical (polar) coordinates, cylindrical coordinates yog rau npe ob peb. Kev nrawm thiab qhov nrawm nrawm kuj muaj cov yam ntxwv sib txawv thaum nws los txog rau cov tshuab qub qub thiab cov tshuab sib txuas.
Kev nrawm
Veocity txhais tau tias yog tus nqi hloov pauv ntawm kev ncua deb. Kev ua lej hais lus nrawm sib npaug dx / dt (nyeem li d, dt x) raws li kev xav ntawm kev suav lej. Nws kuj tseem muaj nyob rau hauv ẋ. Velocity kuj siv daim ntawv ntawm angular tshaj tawm; Nyob rau hauv tas li ntawd, qhov ceev yog sib npaug rau tus nqi hloov ntawm lub kaum sab xis. Ob qhov linear tshaj tawm thiab angular tshaj tawm yog vectors. Linear tshaj tawm muaj cov kev taw qhia ntawm instantaneous txav whilst lub angular tshaj tawm muaj cov kev taw qhia uas txiav txim siab los ntawm txoj kev corkscrew. Velocity yog qhov sib txawv ntawm qhov sib txawv, uas txhais tau hais tias cov kev cai ntawm kev sib raug zoo yuav tsum tau siv rau kev tshaj tawm sib xws nrog qhov ceev ntawm lub teeb.
kwv yees nrawm
Txoj kev sib txheeb yog qhov nrawm ntawm ib qho khoom txheeb ze rau lwm yam khoom. Hauv daim ntawv vector no sau ua V̰A rel B=V̰A – V̰B V̰ rel yog qhov nrawm ntawm qhov khoom "A" txheeb ze rau qhov khoom "B". Feem ntau ib daim duab peb sab nrawm los yog qhov nrawm nrawm yog siv los xam cov txheeb ze tshaj tawm ntawm ob yam khoom. Velocity triangle theory hais tias yog VArel Earth thiab VEarth rel Byog qhia nyob rau hauv ob sab ntawm daim duab peb sab feem rau qhov loj thiab kev taw qhia kab thib peb qhia txog kev taw qhia thiab qhov loj ntawm tus txheeb ze tshaj tawm. kwv tij sib txheeb sib txheeb yog ib qho sib txheeb sib txawv.
qhov sib txawv ntawm qhov nrawm thiab qhov sib txheeb li cas?
Veocity thiab txheeb ze tshaj tawm yog ob qho tib si ntsuas ntawm qhov nrawm thiab kev taw qhia ntawm kev txav ntawm ib qho khoom. Qhov ceev yog ntsuas los ntawm ib tug tseem soj ntsuam. Ib tug tseem soj ntsuam yuav tsum tau muab tso rau ntawm ib tug tseem ncej. Tab sis ib tug tseem ncej tsuas yog ib lub tswv yim. Tag nrho peb cov kev ntsuas tsis tu ncua yog ua tiav hauv ntiaj teb. Peb paub tias lub ntiaj teb nyob rau ntawm lub orbit ncig lub hnub. Nyob rau hauv lub orbit txhais tau hais tias ib txwm muaj ib tug centripetal acceleration mus rau qhov chaw ntawm kev txav. Qhov no txhais tau tias lub ntiaj teb tsis yog ib qho inertial ncej. Tab sis rau feem ntau ntawm kev suav peb muab lub ntiaj teb ua ib qho tseem ceeb. Tab sis qhov tseeb qhov peb ntsuas yog qhov txheeb ze tshaj tawm ntawm cov khoom txheeb ze rau lub ntiaj teb. Lub nrawm yog qhov tseeb yog qhov sib txawv ntawm qhov sib txheeb nrawm nrog VB ua xoom.
