Piv txwv ntawm Kev Tawm Tsam Sai Sai (GLBB)
Kev Tawm Tsam Sai Sai (GLBB) yog ib qho tseem ceeb hauv physics uas feem ntau tshwm sim hauv cov chav kawm theem nrab. GLBB yog kev txav ntawm ib yam khoom hauv ib txoj kab ncaj nraim nrog kev nrawm tas li. Hauv tsab xov xwm no, peb yuav tham txog cov lus txhais, cov qauv yooj yim, thiab ntau qhov piv txwv ntawm cov teeb meem GLBB thiab lawv cov kev daws teeb meem.
Kev Txhais Lus ntawm Kev Tawm Tsam Ceev Ceev (GLBB)
Kev Tawm Tsam Sai Sai (GLBB) yog kev txav ntawm ib yam khoom raws txoj kab ncaj nraim nrog kev nrawm tas li. Kev nrawm tas li txhais tau tias qhov kev hloov pauv ntawm qhov ceev ntawm yam khoom tseem nyob ruaj khov raws sijhawm. GLBB tuaj yeem muab faib ua ob hom:
1. GLBB nrawm dua: Cov khoom muaj kev nrawm dua zoo (kev nrawm nce ntxiv).
2. GLBB qeeb zuj zus: Lub khoom muaj kev nrawm qis (qhov ceev txo qis).
Cov Qauv Tseem Ceeb rau GLBB
Qee cov qauv yooj yim hauv GLBB uas feem ntau siv yog:
1. Cov mis kawg ntawm qhov ceev (v):
\[ v = v_0 + at \]
Qhov twg:
– \( v \) = qhov ceev kawg (m/s)
– \( v_0 \) = qhov ceev pib (m/s)
- \( a \) = kev nrawm (m/s²)
-\( t\) = lub sijhawm (s)
2. Cov mis ntawm qhov deb (s):
\[ s = v_0 t + \frac{1}{2} ntawm ^2 \]
Qhov twg:
- s = qhov deb uas tau mus (m)
– \( v_0 \) = qhov ceev pib (m/s)
- \( a \) = kev nrawm (m/s²)
-\( t\) = lub sijhawm (s)
3. Tus qauv rau qhov ceev thiab qhov deb uas tau mus ncig:
\[ v^2 = v_0^2 + 2 ua \]
Qhov twg:
– \( v \) = qhov ceev kawg (m/s)
– \( v_0 \) = qhov ceev pib (m/s)
- \( a \) = kev nrawm (m/s²)
- s = qhov deb uas tau mus (m)
Piv txwv ntawm GLBB Teeb Meem thiab Kev Dais Teeb Meem
Nov yog qee cov piv txwv ntawm cov teeb meem GLBB nrog rau cov kauj ruam los daws lawv.
Piv txwv lus nug 1
Lo lus nug:
Ib lub tsheb txav nrog qhov ceev pib ntawm 20 m/s thiab muaj kev nrawm ntawm 2 m/s². Xam qhov ceev ntawm lub tsheb tom qab 5 vib nas this!
Kev daws teeb meem:
Nws paub tias:
- Qhov ceev pib (\( v_0 \)) = 20 m/s
- Kev nrawm (\( a \)) = 2 m/s²
- Lub Sijhawm (\( t \)) = 5 vib nas this
Siv cov mis kawg ntawm qhov ceev:
\[ v = v_0 + at \]
\[ v = 20 + (2 \times 5) \]
\[ v = 20 + 10 \]
\[ v = 30 \, \text{m/s} \]
Yog li, qhov ceev ntawm lub tsheb tom qab 5 vib nas this yog 30 m / s.
Piv txwv lus nug 2
Lo lus nug:
Ib yam khoom uas txav nrog qhov ceev pib ntawm 10 m/s yuav muaj qhov nrawm ntawm -3 m/s². Xam seb qhov deb uas yam khoom ntawd tau mus txog hauv 4 vib nas this.
Kev daws teeb meem:
Nws paub tias:
- Qhov ceev pib (\( v_0 \)) = 10 m/s
- Kev nrawm (\( a \)) = -3 m/s²
- Lub Sijhawm (\( t \)) = 4 vib nas this
Siv cov qauv ntsuas qhov deb:
\[ s = v_0 t + \frac{1}{2} ntawm ^2 \]
\[ s = (10 \times 4) + \frac{1}{2} (-3) (4)^2 \]
\[ s = 40 + \frac{1}{2} (-3) \times 16 \]
\[ s = 40 – 24 \]
\[ s = 16 \, \text{m} \]
Yog li, qhov deb uas cov khoom taug kev hauv 4 vib nas this yog 16 meters.
Piv txwv lus nug 3
Lo lus nug:
Lub tsheb kauj vab uas thaum xub thawj nres (qhov ceev pib 0 m/s) raug tsav kom nrawm dua ntawm 5 m/s². Txheeb xyuas qhov ceev ntawm lub tsheb kauj vab tom qab tsav tau deb li 50 meters.
Kev daws teeb meem:
Nws paub tias:
- Qhov ceev pib (\( v_0 \)) = 0 m/s
- Kev nrawm (\( a \)) = 5 m/s²
- Qhov deb mus ncig (s) = 50 meters
Siv cov qauv ntsuas qhov ceev thiab qhov deb:
\[ v^2 = v_0^2 + 2 ua \]
\[ v^2 = 0 + 2 \times 5 \times 50 \]
\[ v^2 = 500 \]
\[ v = \sqrt{500} \]
\[ v = 22,36 \, \text{m/s} \]
Yog li, qhov ceev ntawm lub maus taus tom qab mus ncig deb 50 meters yog 22,36 m/s.
Piv txwv lus nug 4
Lo lus nug:
Ib yam khoom txav nrog qhov ceev pib ntawm 15 m/s thiab qeeb qeeb ntawm 4 m/s² kom txog thaum nws nres. Nws siv sijhawm ntev npaum li cas rau yam khoom ntawd kom nres?
Kev daws teeb meem:
Nws paub tias:
- Qhov ceev pib (\( v_0 \)) = 15 m/s
- Qhov ceev kawg (v) = 0 m/s
- Kev nrawm (\( a \)) = -4 m/s²
Siv cov mis kawg ntawm qhov ceev:
\[ v = v_0 + at \]
\[ 0 = 15 + (-4) t \]
\[ -15 = -4 t \]
\[ t = \frac{15}{4} \]
\[ t = 3,75 \, \text{ vib nas this} \]
Yog li, lub sijhawm uas nws siv rau qhov khoom kom nres yog 3,75 vib nas this.
Piv txwv lus nug 5
Lo lus nug:
Ib lub tsheb txav nrog qhov ceev pib ntawm 25 m/s thiab muaj kev nrawm ntawm 3 m/s² rau 6 vib nas this. Txheeb xyuas qhov deb uas lub tsheb tau mus thaum lub sijhawm no.
Kev daws teeb meem:
Nws paub tias:
- Qhov ceev pib (\( v_0 \)) = 25 m/s
- Kev nrawm (\( a \)) = 3 m/s²
- Lub Sijhawm (\( t \)) = 6 vib nas this
Siv cov qauv ntsuas qhov deb:
\[ s = v_0 t + \frac{1}{2} ntawm ^2 \]
\[ s = (25 \times 6) + \frac{1}{2} (3) (6)^2 \]
\[ s = 150 + \frac{1}{2} (3) \times 36 \]
\[ s = 150 + 54 \]
\[ s = 204 \, \text{m} \]
Yog li, qhov deb uas lub tsheb tau mus txog hauv 6 vib nas this yog 204 meters.
Xaus
Kev Tawm Tsam Sai Sai (GLBB) yog ib lub tswv yim tseem ceeb hauv physics uas piav qhia txog kev txav mus los ntawm ib yam khoom nrog kev nrawm tas li. Kev nkag siab txog cov qauv yooj yim ntawm GLBB thiab kev siv tau rau ntau yam xwm txheej yog ib qho kev txawj ntse tseem ceeb hauv physics. Los ntawm cov piv txwv saum toj no, peb tuaj yeem pom tias cov qauv no siv li cas los xam qhov ceev, qhov deb, thiab lub sijhawm nyob rau hauv ntau yam xwm txheej ntawm kev txav mus los. Yog tias muaj kev xyaum txaus, qhov kev nkag siab ntawm GLBB no tuaj yeem txhim kho thiab siv rau cov teeb meem physics nyuaj dua.
