Kev nrawm yog ib qho vector ntau, ib qho ntau yam uas muaj ob qho tib si qhov loj thiab kev coj. Nws lub cim yog a ( kev nrawm ). Nws lub chav thoob ntiaj teb yog meters ib ob squared, luv m/s 2.
Kev nrawm nruab nrab
Piv txwv teeb meem.
Ib lub tsheb uas thaum xub thawj nres tsis txav li 5 vib nas this ces mam li mus rau sab hnub tuaj nrog qhov ceev ntawm 10 m/s. Txheeb xyuas qhov nruab nrab ntawm qhov kev nrawm.
Kev Sib Tham
Kev taw qhia = sab hnub tuaj.
Qhov nruab nrab ntawm kev nrawm = 2 m/s2 = 2 m/s ib 1 vib nas this, txhais tau tias qhov nruab nrab lub tsheb qhov ceev nce 2 m/s txhua 1 vib nas this. Yog tias lub tsheb qhov kev nrawm tsis hloov tas li, ces lub tsheb qhov ceev ib txwm nce 2 m/s txhua 1 vib nas this. Yog tias lub tsheb qhov kev nrawm tsis hloov tas li, ces lub tsheb qhov ceev tsis tas li nce 2 m/s txhua 1 vib nas this. Tej zaum lub tsheb qhov ceev nce 1 m/s hauv thawj vib nas this, tom qab ntawd nce 3 m/s hauv vib nas this thib ob. Tab sis qhov nruab nrab, thaum txav mus rau 5 vib nas this, lub tsheb qhov ceev nce 2 m/s txhua 1 vib nas this.
Kev nrawm nrawm tam sim ntawd
Qhov loj ntawm kev nrawm tam sim ntawd yog kev hloov pauv kev kub ceev thaum lub sijhawm lub sijhawm luv luv heevHauv nws lub npe, nws feem ntau yog luv rau kev ua kom nrawm.
Ib yam khoom muaj kev nrawm dua yog tias nws qhov ceev hloov pauv. Qhov ceev muaj xws li kev kub ceev dan kev taw qhia ntawm qhov ceev, yog li ntawd ib yam khoom muaj kev nrawm dua Yog tias:
(A) Tsuas yog qhov loj ntawm qhov ceev lossis qhov nrawm hloov pauv xwb (kev taw qhia ceev tas li)
Piv txwv 1: Thaum xub thawj lub tsheb nres, ib pliag tom qab nws txav mus rau hauv txoj kab ncaj (kev coj ua tas mus li) nrog qhov ceev ntawm 4 m/s. Qhov ceev, lossis qhov ceev ntawm lub tsheb hloov ntawm xoom mus rau 4 m/s, yog li ntawd lub tsheb thiaj li hais tias nws tab tom nrawm dua.
Piv txwv 2: Lub tsheb thaum xub thawj txav mus rau hauv ib txoj kab ncaj (kev coj ua tas mus li) nrog qhov ceev ntawm 4 m/s, ib vib nas this tom qab lub tsheb nres. Qhov ceev, lossis qhov ceev ntawm lub tsheb hloov ntawm 4 m/s mus rau xoom, yog li lub tsheb hais tias nws tab tom nrawm dua.
Qhov no tau kawm ntxiv txog qhov tseem ceeb hauv zaj lus qhia tseem ceeb. Kev Tawm Tsam Sai Sai.
(b) Tsuas yog qhov kev taw qhia ntawm qhov ceev hloov pauv xwb (qhov ceev tas li lossis qhov ceev ceev)
Kev taw qhia ntawm qhov ceev = kev taw qhia ntawm kev hloov chaw = kev taw qhia ntawm kev txav mus los. Kev taw qhia ntawm kev hloov pauv ntawm qhov ceev yog tib yam li kev taw qhia ntawm kev hloov chaw lossis kev taw qhia ntawm kev txav mus los ntawm cov khoom hloov pauv.
Qhov no tau kawm ntxiv txog qhov tseem ceeb hauv zaj lus qhia tseem ceeb. Kev Tawm Tsam Ib Txwm.
(C) Qhov loj thiab kev coj ntawm qhov kev hloov pauv ntawm qhov ceev
Qhov no raug kawm ntxiv kom ntxaws ntxiv hauv lub ncauj lus ntawm Kev Txav Mus Los Ntawm Kev Sib Hloov Uas Ceev Dua.
