# Piv txwv ntawm Cov Lus Nug Txog Kev Tawm Tsam Ncaj Ncees
Kev Tawm Tsam Kab Ntsig (GLB) yog lub tswv yim tseem ceeb hauv kev kawm txog physics. Nws yog kev txav ntawm ib yam khoom raws txoj kev ncaj nraim ntawm qhov ceev tas li. Qhov no txhais tau tias tsis muaj kev nrawm, thiab qhov ceev tseem tas li thoob plaws. Tsab xov xwm no yuav muab ntau qhov piv txwv ntawm cov teeb meem GLB thiab lawv cov kev daws teeb meem los pab koj nkag siab zoo dua txog lub tswv yim no.
## Lub ntsiab lus ntawm GLB
Ua ntej peb yuav mus nug cov lus nug piv txwv, cia peb xub rov xyuas qee lub ntsiab lus tseem ceeb ntawm Uniform Linear Motion. Hauv Uniform Linear Motion, qhov velocity equation yog txhais li:
\[ v = \frac{s}{t} \]
Qhov twg:
- \( v \) yog qhov ceev,
– \( s \) yog qhov deb,
- \( t \) yog lub sijhawm.
Vim tias qhov ceev yog qhov tsis hloov pauv, qhov deb uas tau mus ncig tuaj yeem piav qhia los ntawm kab zauv linear:
\[ s = v \times t \]
nrog:
- \( s \) yog qhov deb uas tau mus ncig,
– \( v \) yog qhov ceev tas mus li,
- \( t \) yog lub sijhawm xav tau.
### Piv txwv cov lus nug thiab kev sib tham
#### Lo Lus Nug 1: Xam Qhov Deb
Lo lus nug:
Ib lub tsheb khiav ceev li ntawm 60 km/h li ntawm 2 teev. Lub tsheb khiav deb npaum li cas?
Kev daws teeb meem:
Siv cov qauv ntsuas qhov deb hauv GLB, \( s = v \times t \):
- Ceev (v) = 60 km/h
- Lub Sijhawm (\( t \)) = 2 teev
Qhov deb tau mus (\( s \)):
\[ s = v \times t \]
\[ s = 60 \, \text{km/teev} \times 2 \, \text{teev} \]
\[ s = 120 \, \text{km} \]
Yog li, qhov deb uas lub tsheb tau mus ncig yog 120 km.
#### Lo Lus Nug 2: Xam Lub Sijhawm
Lo lus nug:
Ib tug neeg taug kev txav mus los ntawm qhov ceev tas li ntawm 5 km / teev. Yog tias nws yuav tsum taug kev deb li 15 km, nws yuav siv sijhawm ntev npaum li cas?
Kev daws teeb meem:
Siv cov qauv yooj yim rau lub sijhawm hauv GLB, \( t = \frac{s}{v} \):
– Qhov Nrug Deb (\( s \)) = 15 km
- Ceev (v) = 5 km/h
Lub sijhawm xav tau (\( t \)):
\[ t = \frac{s}{v} \]
\[ t = \frac{15 \, \text{km}}{5 \, \text{km/h}} \]
\[ t = 3 \, \text{yam} \]
Yog li ntawd, lub sijhawm uas tus neeg taug kev xav tau yog 3 teev.
#### Lo Lus Nug 3: Xam Qhov Ceev
Lo lus nug:
Ib tug neeg caij tsheb kauj vab mus tau 18 km hauv 1.5 teev. Tus neeg caij tsheb kauj vab qhov ceev tas li yog dab tsi?
Kev daws teeb meem:
Siv cov qauv yooj yim rau qhov ceev hauv GLB, \( v = \frac{s}{t} \):
– Qhov Nrug Deb (\( s \)) = 18 km
- Lub Sijhawm (\( t \)) = 1.5 teev
Qhov ceev (v):
\[ v = \frac{s}{t} \]
\[ v = \frac{18 \, \text{km}}{1.5 \, \text{teev}} \]
\[ v = 12 \, \text{km/teev} \]
Yog li ntawd, qhov ceev ntawm tus neeg caij tsheb kauj vab yog 12 km / h.
#### Lo lus nug 4: Kev sib xyaw ua ke ntawm qhov deb thiab lub sijhawm
Lo lus nug:
Lub tsheb ciav hlau mus ncig 240 km nrog qhov ceev tas li. Yog tias nws siv sijhawm 3 teev los npog thawj ib feem plaub ntawm qhov deb, xam tag nrho lub sijhawm uas xav tau los ua kom tiav tag nrho txoj kev mus ncig.
Kev daws teeb meem:
Ua ntej tshaj plaws, peb xam qhov deb ntawm ib feem plaub (1/4) ntawm tag nrho cov kev mus ncig:
\[ s_1 = \frac{1}{4} \times 240 \, \text{km} \]
\[ s_1 = 60 \, \text{km} \]
Lub tsheb ciav hlau khiav tau 60 km hauv 3 teev. Yog li, qhov ceev ntawm lub tsheb ciav hlau:
\[ v = \frac{60 \, \text{km}}{3 \, \text{teev}} \]
\[ v = 20 \, \text{km/teev} \]
Tom ntej no, peb xam tag nrho lub sijhawm rau kev mus ncig 240 km ntawm qhov ceev ntawm 20 km / teev:
\[ t = \frac{s}{v} \]
\[ t = \frac{240 \, \text{km}}{20 \, \text{km/h}} \]
\[ t = 12 \, \text{yam} \]
Yog li, tag nrho lub sijhawm xav tau rau lub tsheb ciav hlau los npog tag nrho txoj kev taug kev yog 12 teev.
#### Lo Lus Nug 5: Kev Sib Piv Qhov Deb Los Ntawm Ob Yam Khoom
Lo lus nug:
Ob lub tsheb, A thiab B, tab tom khiav ceev li ntawm 60 km/h thiab 80 km/h. Yog tias lawv pib khiav tib lub sijhawm los ntawm ntau qhov chaw sib txawv, qhov deb ntawm lawv tom qab 2 teev yog dab tsi?
Kev daws teeb meem:
Lub Tsheb A:
\[ v_A = 60 \, \text{km/h} \]
\[ t = 2 \, \text{yam} \]
\[ s_A = v_A \times t \]
\[ s_A = 60 \, \text{km/teev} \times 2 \, \text{teev} \]
\[ s_A = 120 \, \text{km} \]
Tsheb B:
\[ v_B = 80 \, \text{km/teev} \]
\[ t = 2 \, \text{yam} \]
\[ s_B = v_B \times t \]
\[ s_B = 80 \, \text{km/teev} \times 2 \, \text{teev} \]
\[ s_B = 160 \, \text{km} \]
Qhov sib txawv ntawm qhov deb ntawm ob qho no:
\[ \Delta s = s_B – s_A \]
\[ \Delta s = 160 \, \text{km} – 120 \, \text{km} \]
\[ \Delta s = 40 \, \text{km} \]
Yog li ntawd, tom qab 2 teev, qhov deb ntawm ob lub tsheb yog 40 km.
### Xaus lus
Kev Tawm Tsam Kab Ntsig yog lub tswv yim tseem ceeb hauv kev kawm txog physics uas piav qhia txog kev txav mus los ntawm qhov ceev tas li. Los ntawm cov piv txwv uas tau muab, cov nyeem ntawv yuav tsum nkag siab zoo dua txog yuav ua li cas siv cov qauv kev txav mus los kab ntxuas ...
