Kev nrawm ntsuas kev txav chaw pib hauv ib qho chaw thiab mus rau lwm qhov chaw. Cov kev siv tswv yim ntawm kev nrawm yog qhov kawg, tab sis ib qho ntawm cov laj thawj feem ntau los ntsuas qhov nrawm yog txhawm rau txiav txim siab sai npaum li cas koj (lossis txhua yam hauv kev txav) yuav tuaj txog ntawm qhov chaw los ntawm qhov chaw muab.
Vim li cas peb thiaj xav tau nrawm?
Vectors ua kom yooj yim rau kev tswj kom muaj nuj nqis mus rau hauv cov lus qhia sib txawv, vim tias lawv tau tsim los ua raws li cov lus qhia! Qhov no yog vim li cas peb thiaj li muaj lub tswv yim ntawm vector nrawm (nrog rau txoj hauj lwm thiab kev nrawm): los tswj cov lus tsa suab qhov twg cov lus qhia sib txawv koom nrog.
Vim li cas peb thiaj li siv nrawm dua?
yog vim li cas yooj yim. Ceev yog lub sij hawm tus nqi ntawm qhov khoom txav mus raws txoj kev, thaum nrawm yog tus nqi thiab kev taw qhia ntawm qhov khoom txav. Muab lwm txoj kev, ceev yog tus nqi scalar, thaum tshaj tawm yog vector.
txhais li cas thaum nrawm yog 0?
Yog qhov nrawm yog 0, txhais tau tias khoom tsis txav, tab sis nrog kev nrawm tam sim no, muaj lub zog ua rau ntawm qhov khoom. Ib qho piv txwv zoo yog lub vertex ntawm ib qho inverted parabola (raws li x -axis). Kev nrawm qeeb qeeb, tab sis raug rau qhov nrawm ntawm 9.8 ms2 [down]. Slide Player.
Leej twg invented velocity?
In the 14th century, Nicholas Oresme sawv cev rau lub sijhawm thiab nrawm los ntawm qhov ntev. Nws invented ib homtswj geometry ua ntej Descartes. Qhov xav tau kev piav qhia lej ntawm qhov nrawm tau pab txhawb txoj kev loj hlob ntawm lub tswv yim ntawm tus lej.
