Kev txhais ntawm kev txav mus los tsis sib xws
Kev txav mus los tsis sib xws yog kev txav mus los ntawm kev nrawm tas li. Hauv lwm lo lus, kev txav mus los tsis sib xws = kev txav mus los nrog kev loj hlob ntawm kev nrawm yog tas li thiab kev coj ntawm kev nrawm yog tas li. Kev taw qhia ntawm kev nrawm yog tas li = kev taw qhia ntawm qhov ceev yog tas li = kev taw qhia ntawm kev hloov chaw yog tas li = kev taw qhia ntawm kev txav mus los yog tas li = qhov khoom txav mus los hauv ib txoj kab ncaj. Qhov loj ntawm kev nrawm tas li txhais tau tias qhov loj ntawm kev nrawm lossis kev ceev nce ntxiv tas li.
Piv txwv thawj zaug:
Thaum xub thawj, ib yam khoom nyob twj ywm. Ib pliag tom qab, yam khoom txav mus los ntawm qhov ceev ntawm 2 m/s. Ob vib nas this tom qab, yam khoom txav mus los ntawm qhov ceev ntawm 4 m/s. Peb vib nas this tom qab, yam khoom txav mus los ntawm qhov ceev ntawm 6 m/s. Plaub vib nas this tom qab, yam khoom txav mus los ntawm qhov ceev ntawm 8 m/s. Thiab lwm yam...
Txhua 1 vib nas this, qhov ceev ntawm yam khoom nce ntxiv 2 m/s. Yam khoom ntawd muaj kev nrawm tas li ntawm 2 m/s ib vib nas this lossis 2 m/s ib vib nas this lossis 2 m/s 2.
Qhov thib ob piv txwv:
Thaum xub thawj ib yam khoom txav mus nrog qhov ceev ntawm 10 m/s. Ib vib nas this tom qab.
Qhov ceev raug txo mus rau 9 m/s. Ob vib nas this tom qab, qhov ceev raug txo mus rau 8 m/s. Peb vib nas this tom qab, qhov ceev raug txo mus rau 7 m/s. Plaub vib nas this tom qab, qhov ceev raug txo mus rau 6 m/s. Thiab ntxiv mus ... Txhua 1 vib nas this, qhov ceev ntawm yam khoom txo los ntawm 1 m/s. Yam khoom muaj qhov qeeb tas li ntawm 1 m/s ib vib nas this lossis 1 m/s ib vib nas this lossis 1 m/s 2.
Kev sib npaug ntawm kev txav mus los tsis sib xws
Muaj peb hom qauv sib npaug uas feem ntau siv:
v t = v0 + at
d = vot + 1/2 ntawm 2
v t 2 = v o 2 + 2 ad
v = qhov ceev pib (meter/ob vib nas this), v = qhov ceev kawg (meter/ob vib nas this), a = qhov nrawm (meter/ob vib nas this), t = lub sijhawm luv (ob vib nas this), d = qhov deb (meter).
Piv txwv teeb meem 1:
Ib lub khoom me me, thaum xub thawj so, ces nws nrawm li 2 m/s 2 rau 10 vib nas this. Xam qhov ceev kawg ntawm lub khoom me me.
tshuaj:
Tsis muaj kev sib npaug:
Kev nrawm (a) = 2 m/s 2 txhais tau tias qhov ceev (v) nce 2 m/s txhua 1 vib nas this. Tom qab 2 vib nas this, v = 4 m/s. Tom qab 10 vib nas this, v = 20 m/s.
Siv cov qauv sib npaug:
Paub : v0 = 0 m/s (cov khoom me me thaum so), a = 2 m/s2 , t = 10 s
Xav tau: v t
v t = vo + at = 0 + (2)(10) = 20 m/s
Piv txwv teeb meem 2:
Ib lub tsheb khiav ntawm txoj kev ncaj nraim nrog qhov ceev ntawm 60 km/h. Vim muaj ib qho teeb meem, tus tsav tsheb thiaj li nres, yog li lub tsheb thiaj li qeeb qeeb li 10 m/s2. Lub tsheb tseem mus deb npaum li cas kom txog thaum nws nres tom qab nres tas?
Paub:
v o = 60 km/h = 60(1000 m)/3600 s = 17 m/s
v t = 0 m/s (tsheb nres)
2a = – 10 m/s
Xav tau: qhov deb (d)
tshuaj:
v t 2 = v o 2 + 2 ad
(0) 2 = (17) 2 + 2(-10) hnub
0 = 289 – 20 hnub
289 = 20 hnub
d = 289 : 20 = 14.45 meters
Piv txwv teeb meem 3:
Daim duab hauv qab no yog daim duab qhia txog kev txav mus los uas tsis sib xws, v sawv cev rau qhov ceev, thiab t hais txog lub sijhawm. Qhov loj ntawm kev nrawm ntawm cov khoom raws li daim duab yog ...
Piv txwv teeb meem 4:
Kev txav ntawm lub tsheb tsim ib daim duab qhia txog qhov ceev (v) vs lub sijhawm (t) raws li pom hauv daim duab ntawm sab. Yog tias thaj chaw hauv qab daim duab (cheeb tsam ntxoov ntxoo) yog 48 m, ces qhov kev nrawm ntawm lub tsheb yog ...
Thaj chaw ntxoov ntxoo = tag nrho qhov deb = 48 meters
v0 = 8 m/s, vt = 16 m/s, t = 1 m/s
vt = v0 + at
16 = 8 + ib (1)
ib = 16 – 8
a = 8 m/s 2
or
Cov lus nug thiab lus teb txog kev txav mus los tsis sib xws
- Kev txav mus los tsis sib xws yog dab tsi?
Kev txav mus los tsis sib xws yog hais txog kev txav mus los ntawm ib yam khoom raws txoj kab ncaj nraim nrog qhov ceev lossis qhov ceev hloov pauv.
- Kev txav mus los tsis sib xws li cas sawv cev rau ntawm daim duab qhia qhov deb-lub sijhawm?
Kev txav mus los tsis sib xws yog sawv cev los ntawm ib txoj kab nkhaus ntawm daim duab qhia qhov deb-lub sijhawm.
- Kev ua kom nrawm ua lub luag haujlwm dab tsi hauv kev txav mus los tsis sib xws?
Kev nrawm yog ib qho tseem ceeb hauv kev txav mus los tsis sib xws. Nws yog tus nqi uas qhov ceev hloov pauv raws sijhawm.
- Yuav ua li cas ib tug neeg thiaj paub txog kev txav mus los tsis sib xws ntawm daim duab qhia ceev-lub sijhawm?
Kev txav mus los tsis sib xws yog sawv cev los ntawm kab tsis kab rov tav (nce lossis txo qis) ntawm daim duab qhia ceev-lub sijhawm, qhia tias qhov ceev hloov pauv raws sijhawm.
- Lub chav ntsuas ntawm kev nrawm hauv International System of Units (SI) yog dab tsi?
Lub chav ntawm kev nrawm hauv SI system yog meters ib ob squared (m/s²).
- Cov qauv rau kev hloov chaw hauv kev txav mus los tsis sib xws, muab qhov ceev pib, kev ua kom nrawm, thiab lub sijhawm yog dab tsi?
Cov mis yog s = ut + ½at², qhov twg s yog qhov hloov chaw, u yog qhov ceev pib, a yog qhov ua kom nrawm dua, thiab t yog lub sijhawm.
- Puas yog qhov kev hloov chaw 's' yuav tsis zoo hauv kev txav mus los tsis sib xws?
Yog, qhov kev hloov chaw 's' tuaj yeem yog qhov tsis zoo hauv kev txav mus los tsis sib xws. Qhov no yuav qhia txog kev txav mus rau qhov kev taw qhia rov qab rau qhov kev taw qhia zoo uas tau xaiv.
- Puas ua tau rau ib yam khoom uas tsis sib npaug zos txav mus los kom nres?
Yog, ib yam khoom uas tsis sib npaug zos yuav nres tau yog tias nws qhov kev nrawm ua rau qhov kev taw qhia ntawm kev txav mus los thiab txo qhov ceev ntawm yam khoom mus rau xoom.
- Cov mis rau qhov ceev kawg hauv kev txav mus los tsis sib xws, muab qhov ceev pib, kev ua kom nrawm, thiab lub sijhawm yog dab tsi?
Tus qauv yog v = u + at, qhov twg v yog qhov ceev kawg, u yog qhov ceev pib, a yog qhov ua kom nrawm dua, thiab t yog lub sijhawm.
- Lub tswv yim ntawm kev jerk siv rau kev txav mus los tsis sib xws li cas?
Kev tshee hnyo yog qhov nrawm ntawm kev hloov pauv ntawm kev nrawm. Hauv kev txav mus los tsis sib xws, yog tias kev nrawm tsis ruaj khov thiab hloov pauv raws sijhawm, ces kev tshee hnyo muaj.
