Kev nrawm yog lub luag haujlwm ntawm lub sijhawm thiab txiav txim siab los ntawm ob qhov loj thiab kev coj. Hauv cov teeb meem physics, koj feem ntau yuav tsum xam qhov pib tshaj tawm (nrawm thiab kev taw qhia) cov khoom pib txav mus. Muaj ntau qhov sib npaug uas tuaj yeem siv los txiav txim siab qhov pib tshaj tawm. Koj tuaj yeem txiav txim siab qhov sib npaug uas raug los siv thiab teb cov lus nug siv cov ntaub ntawv uas koj paub hauv qhov teeb meem.
Kauj ruam
Txoj Kev 1 ntawm 4: Nrhiav Pib Tshaj Tawm los ntawm Kev Tshaj Tawm Zaum Kawg, Ua Kom nrawm, thiab Sijhawm
Kauj Ruam 1. Siv qhov sib npaug raug
Txhawm rau daws cov teeb meem physics, koj yuav tsum paub qhov sib npaug uas tsim nyog tshaj plaws los siv. Sau tag nrho cov ntaub ntawv paub yog thawj kauj ruam los nrhiav qhov sib npaug raug. Yog tias koj muaj qhov nrawm tshaj, nrawm dua, thiab lub sijhawm muaj txiaj ntsig, koj tuaj yeem siv cov zauv hauv qab no:
- Thawj zaug ceev: Vkuv = Vf - (ib*t)
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Nkag siab tias txhua lub cim hauv kab zauv txhais li cas.
- Vkuv yog lub cim rau "pib nrawm"
- Vf yog lub cim ntawm "qhov nrawm kawg"
- a yog lub cim rau "nrawm"
- t yog lub cim rau "sijhawm"
- Nco ntsoov tias qhov kev ua zauv no yog tus qauv sib npaug siv los nrhiav qhov pib tshaj tawm.
Kauj Ruam 2. Sau cov ntaub ntawv paub hauv kab zauv
Tom qab sau cov ntaub ntawv paub thiab txiav txim siab qhov sib npaug raug, koj tuaj yeem nkag mus rau qhov txiaj ntsig rau hauv qhov sib txawv uas tsim nyog. Nkag siab txhua qhov teeb meem kom zoo, thiab sau txhua kauj ruam ntawm kev daws teeb meem yog qhov tseem ceeb.
Yog tias koj ua yuam kev, koj tuaj yeem pom nws yooj yim los ntawm kev hla cov kauj ruam dhau los
Kauj Ruam 3. Daws qhov sib npaug
Thaum tag nrho cov lej tau muab rau qhov sib txawv tsim nyog, siv qhov ua kom raug ntawm cov lej los daws lawv. Yog tso cai, siv lub laij lej los txo qhov ua yuam kev hauv kev suav.
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Piv txwv li: ib qho khoom txav mus rau sab hnub tuaj ntawm qhov nrawm ntawm 10 meters ib ob npaug rau 12 vib nas this kom txog thaum nws mus txog qhov kawg ntawm 200 meters ib pliag. Nrhiav tus kwv qhov pib tshaj tawm.
- Sau cov ntaub ntawv paub:
- Vkuv =?, VVVf = 200 m/s, a = 10 m/s2t, 12s
- Ua kom nrawm nrawm raws sijhawm. ib * t = 10 * 12 = 120
- Txo qhov nrawm kawg nrog cov txiaj ntsig suav saum toj no. Vkuv = Vf - (a * t) = 200 - 120 = 80 Vkuv = 80 m/s rau sab hnub tuaj.
- Sau koj cov lus teb kom raug. Suav nrog chav ntsuas, feem ntau yog meters ib pliag lossis m/s, nrog rau cov kev taw qhia uas cov khoom txav mus. Tsis tau muab cov ntaub ntawv hais txog kev taw qhia, koj tsuas yog muab ntsuas qhov nrawm, thiab tsis yog qhov nrawm ntawm qhov khoom.
Txoj Kev 2 ntawm 4: Nrhiav Pib Tshaj Tawm los ntawm Kev Nyob, Lub Sijhawm, thiab Kev Ceev
Kauj Ruam 1. Siv qhov sib npaug raug
Txhawm rau daws cov teeb meem physics, koj yuav tsum paub qhov sib piv twg los siv. Sau tag nrho cov ntaub ntawv paub yog thawj kauj ruam los txiav txim qhov sib npaug raug. Yog tias koj paub qhov tseem ceeb rau kev nrug deb, sijhawm, thiab nrawm, koj tuaj yeem siv cov zauv hauv qab no:
- Thawj zaug ceev: Vkuv = (d / t) - [(a * t) / 2]
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Nkag siab tias txhua lub cim hauv kab zauv txhais li cas.
- Vkuv yog lub cim rau "pib nrawm"
- d yog lub cim rau "nrug"
- a yog lub cim rau "nrawm"
- t yog lub cim rau "sijhawm"
Kauj Ruam 2. Sau cov ntaub ntawv paub hauv kab zauv
Tom qab sau tag nrho cov ntaub ntawv paub thiab txiav txim qhov sib npaug raug, koj tuaj yeem sau cov lej rau txhua qhov kev hloov pauv uas tsim nyog. Nws yog ib qho tseem ceeb kom nkag siab txhua lo lus nug ua tib zoo thiab sau txhua kauj ruam kev suav.
Yog tias koj ua yuam kev, koj tuaj yeem pom nws yooj yim los ntawm kev hla cov kauj ruam dhau los
Kauj Ruam 3. Daws qhov sib npaug
Tom qab nkag mus rau txhua tus lej hauv qhov sib txawv uas tsim nyog, siv qhov ua kom raug suav los daws qhov teeb meem. Yog tias tau tso cai, siv lub laij lej txhawm rau txo txoj hauv kev suav qhov yuam kev yooj yim.
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Piv txwv li: ib qho khoom txav mus rau 150 metres sab hnub poob nrog kev nrawm ntawm 7 meters ib ob npaug rau ob vib nas this. Xam lub hom phiaj qhov pib tshaj tawm.
- Sau cov ntaub ntawv paub:
- Vkuv =?, d = 150 m, a = 7 m/s2t, 30 os
- Ua kom nrawm nrawm thiab sijhawm. ib * t = 7 * 30 = 210
- Faib qhov tshwm sim los ntawm 2. (a * t) / 2 = 210/2 = 105
- Faib qhov nrug los ntawm lub sijhawm. d/t = 150/30 = 5
- Rho tawm tus nqi uas koj tau txais hauv kev xam thib ob los ntawm tus nqi uas koj tau txais hauv thawj qhov kev suav. Vkuv = (d / t) - [(a * t) / 2] = 5 - 105 = -100 Vkuv = -100 m/s rau sab hnub poob.
- Sau koj cov lus teb kom raug. Suav nrog ib chav ntsuas rau qhov nrawm, feem ntau yog meters ib pliag, lossis m/s, nrog rau cov kev taw qhia uas cov khoom txav mus. Yog tsis muab cov ntaub ntawv hais txog qhov nrug deb, koj tsuas yog muab qhov ntsuas ntawm qhov khoom nrawm, tsis yog nws qhov nrawm.
Txoj Kev 3 ntawm 4: Nrhiav Pib Tshaj Tawm los ntawm Kev Tshaj Tawm Zaum Kawg, Ua Kom nrawm dua, thiab nrug deb li cas
Kauj Ruam 1. Siv qhov sib npaug raug
Koj yuav tsum paub qhov sib npaug siv los daws teeb meem physics. Sau tag nrho cov ntaub ntawv paub yog thawj kauj ruam los txiav txim qhov sib npaug raug. Yog tias koj paub qhov nrawm tshaj, ua kom nrawm, thiab nrug deb ntawm qhov teeb meem, koj tuaj yeem siv cov zauv hauv qab no:
- Thawj zaug ceev: Vkuv = [Vf2 - (2*a*d)]
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Nkag siab lub ntsiab lus ntawm txhua lub cim.
- Vkuv yog lub cim rau "pib nrawm"
- Vf yog lub cim ntawm "qhov nrawm kawg"
- a yog lub cim rau "nrawm"
- d yog lub cim rau "nrug"
Kauj Ruam 2. Sau cov ntaub ntawv paub hauv kab zauv
Tom qab sau tag nrho cov ntaub ntawv paub thiab txiav txim qhov sib npaug raug, koj tuaj yeem ntsaws cov lej rau hauv qhov sib txawv uas tsim nyog. Nws yog ib qho tseem ceeb kom nkag siab txhua nqe lus nug kom zoo thiab sau txhua kauj ruam kev suav.
Yog tias koj ua yuam kev, koj tuaj yeem pom nws yooj yim los ntawm kev hla cov kauj ruam dhau los
Kauj Ruam 3. Daws qhov sib npaug
Tom qab nkag mus rau txhua tus lej hauv qhov sib txawv uas tsim nyog, siv qhov ua kom raug suav los daws qhov teeb meem. Yog tias tau tso cai, siv lub laij lej txhawm rau txo txoj hauv kev suav qhov yuam kev yooj yim.
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Piv txwv li: ib qho khoom txav mus rau 10 metres sab qaum teb ntawm qhov nrawm ntawm 5 meters ib ob npaug ob, kom txog thaum nws mus txog qhov kawg ntawm 12 meters ib pliag. Xam lub hom phiaj qhov pib tshaj tawm.
- Sau cov ntaub ntawv paub:
- Vkuv =?, VVVf = 12 m/s, a = 5 m/s2d, 10 m = np
- Square qhov kawg tshaj tawm. Vf2 = 122 = 144
- Muab cov zauv nrawm los ntawm qhov deb thiab tus lej 2. 2 * a * d = 2 * 5 * 10 = 100
- Rho tawm qhov tshwm sim ntawm thawj qhov suav los ntawm qhov tshwm sim ntawm kev xam thib ob. Vf2 - (2 * a * d) = 144 - 100 = 44
- Hauv paus koj cov lus teb. = [Vf2 - (2 * a * d)] = 44 = 6.633 Vkuv = 6,633 m/s rau sab qaum teb
- Sau koj cov lus teb kom raug. Suav nrog ib chav ntsuas rau qhov nrawm, feem ntau yog meters ib pliag, lossis m/s, nrog rau cov lus qhia uas cov khoom txav mus. Tsis tau muab cov ntaub ntawv hais txog qhov kev ncua deb, koj tsuas yog muab qhov ntsuas ntawm qhov khoom nrawm, tsis yog nws qhov nrawm.
Txoj Kev 4 ntawm 4: Nrhiav Pib Tshaj Tawm los ntawm Qhov Tshaj Tawm Zaum Kawg, Lub Sijhawm, thiab Nyob Ze
Kauj Ruam 1. Siv qhov sib npaug raug
Koj yuav tsum paub qhov sib npaug siv los daws teeb meem physics. Sau tag nrho cov ntaub ntawv paub yog thawj kauj ruam los txiav txim qhov sib npaug raug. Yog tias koj qhov teeb meem suav nrog qhov nrawm kawg, sijhawm, thiab nrug, koj tuaj yeem siv cov zauv hauv qab no:
- Thawj zaug ceev: Vkuv = Vf + 2 (t - d)
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Nkag siab lub ntsiab lus ntawm txhua lub cim.
- Vkuv yog lub cim rau "pib nrawm"
- Vf yog lub cim ntawm "qhov nrawm kawg"
- t yog lub cim rau "sijhawm"
- d yog lub cim rau "nrug"
Kauj Ruam 2. Sau cov ntaub ntawv paub hauv kab zauv
Tom qab sau tag nrho cov ntaub ntawv paub thiab txiav txim qhov sib npaug raug, koj tuaj yeem ntsaws cov lej rau hauv qhov sib txawv uas tsim nyog. Nws yog ib qho tseem ceeb kom nkag siab txhua nqe lus nug kom zoo thiab sau txhua kauj ruam kev suav.
Yog tias koj ua yuam kev, koj tuaj yeem pom nws yooj yim los ntawm kev hla cov kauj ruam dhau los
Kauj Ruam 3. Daws qhov sib npaug
Tom qab nkag mus rau txhua tus lej hauv qhov sib txawv uas tsim nyog, siv qhov ua kom raug suav los daws qhov teeb meem. Yog tias tau tso cai, siv lub laij lej txhawm rau txo txoj hauv kev suav qhov yuam kev yooj yim.
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Piv txwv li: ib yam khoom nrog qhov nrawm kawg ntawm 3 meters ib pliag tau txav mus rau sab qab teb rau 45 vib nas this thiab taug kev deb li 15 meters. Xam lub hom phiaj qhov pib tshaj tawm.
- Sau cov ntaub ntawv paub:
- Vkuv =?, VVVf = 3 m/s, t = 15 s, d = 45 m
- Faib tus nqi nrug los ntawm lub sijhawm. (d/t) = (45/15) = 3
- Muab cov txiaj ntsig los ntawm 2. 2 (d/t) = 2 (45/15) = 6
- Rho tawm qhov tshwm sim ntawm cov lus suav saum toj no nrog qhov tshaj tawm zaum kawg. 2 (d/t) - Vf = 6 - 3 = 3Vkuv = 3 m/s rau sab qab teb.
- Sau koj cov lus teb kom raug. Suav nrog ib chav ntsuas rau qhov nrawm, feem ntau yog meters ib pliag, lossis m/s, nrog rau cov lus qhia uas cov khoom txav mus. Tsis tau muab cov ntaub ntawv hais txog qhov kev ncua deb, koj tsuas yog muab qhov ntsuas ntawm qhov khoom nrawm, tsis yog nws qhov nrawm.
