Qhov kev quab yuam ib txwm yog qhov loj ntawm lub zog uas yuav tsum tau ua kom tsis zoo rau lwm lub zog hauv txhua qhov xwm txheej. Txoj hauv kev zoo tshaj plaws los nrhiav nws nyob ntawm qhov xwm txheej ntawm qhov khoom thiab qhov sib txawv uas koj muaj. Mus nyeem ntawv kom paub ntau ntxiv.
Kauj ruam
Txoj Kev 1 ntawm 5: Cov Qauv Ib Leeg Thaum So
Kauj Ruam 1. Nkag siab lub ntsiab lus ntawm kev quab yuam ib txwm muaj
Qhov quab yuam ib txwm hais txog qhov loj ntawm qhov quab yuam uas siv los tsis lees paub lub zog nqus.
Xav txog qhov thaiv ntawm so ntawm lub rooj. Lub zog ntawm lub ntiajteb txawj nqus rub lub block mus rau lub ntiaj teb, tab sis meej, muaj lub zog ua, tiv thaiv lub thaiv los ntawm kev tsoo lub rooj thiab poob rau hauv av. Lub zog uas ua kom nres qhov thaiv no txawm hais tias lub zog ntawm lub ntiajteb txawj nqus hu ua zoo li qub.
Kauj Ruam 2. Paub qhov sib npaug rau qhov quab yuam ib txwm muaj ntawm ib yam khoom thaum so
Thaum xam cov khoom ib txwm quab yuam thaum nws so ntawm qhov chaw tiaj, siv cov qauv: N = m * g
- Hauv qhov kev ua zauv no, N ua piv txwv li qub, m sawv cev rau qhov hnyav ntawm qhov khoom, thiab g sawv cev rau kev nrawm vim lub ntiajteb txawj nqus.
- Rau ib yam khoom uas tau so ntawm qhov chaw tiaj tus, tsis muaj lub zog sab nraud ua, lub zog ib txwm yog sib npaug ntawm qhov hnyav ntawm qhov khoom. Txhawm rau khaws ib yam khoom ntawm qhov chaw so, lub zog ib txwm yuav tsum sib npaug ntawm lub zog nqus ua rau ntawm qhov khoom. Lub zog quab yuam ua rau ib yam khoom yog qhov hnyav ntawm qhov khoom, lossis qhov hnyav ntawm cov khoom siv lub sijhawm nrawm vim yog lub ntiajteb txawj nqus.
- Piv txwv: Nrhiav qhov quab yuam ib txwm muaj ntawm qhov thaiv nrog qhov hnyav ntawm 4.2 kg.
Kauj Ruam 3. Muab cov khoom hnyav sib npaug thiab ua kom nrawm vim lub ntiajteb txawj nqus
Qhov kev sib ntxiv no yuav tsim qhov hnyav ntawm qhov khoom, uas yog qhov sib npaug ntawm qhov quab yuam ib txwm muaj ntawm cov khoom thaum so.
- Nco tseg tias kev nrawm nrawm vim lub ntiajteb txawj nqus nyob ib puag ncig: g = 9.8 m/s2
- Piv txwv: hnyav = m * g = 4, 2 * 9, 8 = 41, 16
Kauj Ruam 4. Sau koj cov lus teb
Cov kauj ruam dhau los yuav daws qhov teeb meem, muab koj cov lus teb rau koj.
Piv txwv: Lub zog ib txwm yog 41, 16 N
Txoj Kev 2 ntawm 5: Lub Cev Muaj Zog ntawm lub dav hlau inclined
Kauj Ruam 1. Siv qhov sib npaug raug
Txhawm rau suav qhov quab yuam ib txwm ntawm ib yam khoom qaij los ntawm lub kaum ntse ntse, koj yuav tsum siv cov qauv: N = m * g * cos (x)
- Rau qhov sib npaug no, N ua piv txwv li qub, m sawv cev qhov hnyav ntawm qhov khoom g sawv cev rau kev nrawm vim lub ntiajteb txawj nqus, thiab x kev sawv cev rau oblique kaum sab xis.
- Piv txwv li: Nrhiav qhov kev quab yuam ib txwm muaj ntawm qhov hnyav ntawm 4.2 kg, uas nyob ntawm lub dav hlau inclined nrog kev nyiam ntawm 45 degrees.
Kauj Ruam 2. Nrhiav cosine ntawm lub kaum sab xis
Lub cosine ntawm lub kaum sab xis yog sib npaug ntawm sine ntawm lub kaum sab xis, lossis sab uas nyob ib sab tau faib los ntawm hypotenuse ntawm daim duab peb sab tsim los ntawm txoj kab nqes hav.
- Tus nqi no feem ntau txiav txim siab nrog lub laij lej vim tias cosine ntawm txhua lub kaum ntse ntse ib txwm tas li, tab sis koj kuj tuaj yeem suav nws tus kheej.
- Piv txwv: cos (45) = 0.71
Kauj Ruam 3. Nrhiav qhov hnyav ntawm qhov khoom
Qhov hnyav ntawm ib yam khoom yog sib npaug rau qhov hnyav ntawm cov khoom lub sijhawm nrawm vim yog lub ntiajteb txawj nqus.
- Nco tseg tias kev nrawm nrawm vim lub ntiajteb txawj nqus nyob ib puag ncig: g = 9.8 m/s2
- Piv txwv: hnyav = m * g = 4, 2 * 9, 8 = 41, 16
Kauj Ruam 4. Muab ob qhov txiaj ntsig
Txhawm rau nrhiav lub zog ib txwm muaj, koj yuav tsum muab qhov hnyav ntawm qhov khoom los ntawm cosine ntawm lub kaum sab xis ntawm kev xav.
Piv txwv: N = m * g * cos (x) = 41, 16 * 0, 71 = 29, 1
Kauj Ruam 5. Sau koj cov lus teb
Cov kauj ruam dhau los yuav daws qhov teeb meem thiab muab koj cov lus teb.
- Nco ntsoov tias thaum ib yam khoom so ntawm qhov ntxeev, lub zog ib txwm yuav tsawg dua li qhov hnyav.
- Piv txwv: Lub zog ib txwm yog 29.1 N.
Txoj Kev 3 ntawm 5: Cov Qauv Zoo Li Qub Nrog Cov Qub
Kauj Ruam 1. Siv qhov sib npaug raug
Txhawm rau suav qhov quab yuam ib txwm ntawm ib qho khoom ntawm kev so yog tias muaj sab nraud nqes mus rau ntawm qhov khoom, siv qhov sib npaug: N = m * g + F * sin (x) '
- N ua piv txwv li qub, m sawv cev qhov hnyav ntawm qhov khoom g sawv cev rau kev nrawm vim lub ntiajteb txawj nqus, F symbolizes sab nrauv style, thiab x kev sawv cev rau lub kaum sab xis nruab nrab ntawm qhov khoom thiab kev taw qhia ntawm lub zog sab nraud.
- Piv txwv: Nrhiav qhov quab yuam ib txwm muaj ntawm qhov hnyav ntawm 4.2 kg yog tias tus neeg raug thawb los ntawm tus neeg ntawm lub kaum sab xis ntawm 30 degrees thiab lub zog ntawm 20.9 N.
Kauj Ruam 2. Nrhiav qhov hnyav ntawm qhov khoom
Qhov hnyav ntawm ib yam khoom yog sib npaug rau qhov hnyav ntawm cov khoom lub sijhawm nrawm vim yog lub ntiajteb txawj nqus.
- Nco tseg tias kev nrawm nrawm vim lub ntiajteb txawj nqus nyob ib puag ncig: g = 9.8 m/s2
- Piv txwv: hnyav = m * g = 4, 2 * 9, 8 = 41, 16
Kauj Ruam 3. Nrhiav lub sine ntawm lub kaum sab xis
Lub sine ntawm lub kaum sab xis yog xam los ntawm kev faib sab ntawm daim duab peb sab uas tig rov los ntawm lub kaum sab xis, los ntawm hypotenuse ntawm lub kaum sab xis.
Piv txwv: txhaum (30) = 0.5
Kauj Ruam 4. Sib npaug sine los ntawm lub zog sab nraud
Sab nraud quab yuam, hauv qhov piv txwv no, hais txog lub zog nqes los tsoo qhov khoom.
Piv txwv: 0, 5 * 20, 9 = 10, 45
Kauj Ruam 5. Ntxiv tus nqi no rau qhov hnyav
Cov nyiaj no yuav muab qhov loj ntawm qhov quab yuam ib txwm ua.
Piv txwv: 10, 45 + 41, 16 = 51, 61
Kauj Ruam 6. Sau koj cov lus teb
Nco ntsoov tias rau ib qho khoom ntawm so uas cuam tshuam los ntawm kev tawm sab nraud, lub zog ib txwm yuav ntau dua li qhov hnyav.
Piv txwv: Lub zog ib txwm yog 51.61 N
Txoj Kev 4 ntawm 5: Cov Qauv Ib Leeg nrog Txheej Txheej Txheem
Kauj Ruam 1. Siv qhov sib npaug raug
Txhawm rau suav qhov quab yuam ib txwm ntawm ib yam khoom ntawm so yog tias muaj lub zog sab nraud sab nraud ntawm qhov khoom, siv qhov sib npaug: N = m * g - F * sin (x) '
- N ua piv txwv li qub, m sawv cev qhov hnyav ntawm qhov khoom g sawv cev rau kev nrawm vim lub ntiajteb txawj nqus, F symbolizes sab nrauv style, thiab x kev sawv cev rau lub kaum sab xis nruab nrab ntawm qhov khoom thiab kev taw qhia ntawm lub zog sab nraud.
- Piv txwv: Nrhiav qhov quab yuam ib txwm muaj ntawm qhov hnyav ntawm 4.2 kg, yog tias ib tus neeg rub lub block nce ntawm lub kaum sab xis ntawm 50 degrees thiab lub zog ntawm 20.9 N.
Kauj Ruam 2. Nrhiav qhov hnyav ntawm qhov khoom
Qhov hnyav ntawm ib yam khoom yog sib npaug rau qhov hnyav ntawm cov khoom lub sijhawm nrawm vim yog lub ntiajteb txawj nqus.
- Nco tseg tias kev nrawm nrawm vim lub ntiajteb txawj nqus nyob ib puag ncig: g = 9.8 m/s2
- Piv txwv: hnyav = m * g = 4, 2 * 9, 8 = 41, 16
Kauj Ruam 3. Nrhiav lub sine ntawm lub kaum sab xis
Lub sine ntawm lub kaum sab xis yog xam los ntawm kev faib sab ntawm daim duab peb sab uas tig rov los ntawm lub kaum sab xis, los ntawm hypotenuse ntawm lub kaum sab xis.
Piv txwv: txhaum (50) = 0, 77
Kauj Ruam 4. Sib npaug sine los ntawm lub zog sab nraud
Lub zog sab nraud hais txog lub zog nce mus rau qhov khoom, hauv qhov no.
Piv txwv: 0.77 * 20, 9 = 16, 01
Kauj Ruam 5. Tshem tus nqi no los ntawm qhov hnyav
Qhov rho tawm koj ua yuav muab rau koj qhov loj ntawm qhov quab yuam ib txwm ua rau nws.
Piv txwv: 41, 16 - 16, 01 = 25, 15
Kauj Ruam 6. Sau koj cov lus teb
Nco ntsoov tias ib yam khoom ntawm so tau cuam tshuam los ntawm kev tawm sab nraud sab nraud, lub zog ib txwm yuav tsawg dua li qhov hnyav.
Piv txwv: Lub zog ib txwm yog 25, 15 N
Txoj Kev 5 ntawm 5: Lub Zog Ib Leeg thiab Kev Sib txhuam
Kauj Ruam 1. Paub qhov sib npaug yooj yim rau kev sib txhuam kinetic
Kinetic kev sib txhuam, lossis kev sib txhuam ntawm cov khoom txav, yog sib npaug rau qhov coefficient ntawm kev sib txhuam lub sij hawm ib txwm quab yuam ntawm ib yam khoom. Hauv daim ntawv zauv: f = * np
- Hauv qhov kev ua zauv no, f cim kev sib txhuam, ️ sawv cev rau coefficient ntawm kev sib txhuam, thiab N sawv cev rau qhov qub quab yuam ntawm qhov khoom.
- Qhov "coefficient ntawm kev sib txhuam" yog qhov sib piv ntawm kev sib txhuam quab yuam rau qhov quab yuam ib txwm muaj, uas ua rau ob lub ntsej muag tawm tsam.
Kauj Ruam 2. Teeb tsa kab zauv kom cais qhov quab yuam ib txwm muaj
Yog tias koj paub tus nqi ntawm cov khoom sib txhuam ntawm kev sib txhuam, nrog rau nws qhov coefficient ntawm kev sib txhuam, koj tuaj yeem suav qhov quab yuam ib txwm siv cov qauv: N = f / ib
- Ob tog ntawm thawj qhov kev ua zauv tau faib los ntawm ️, yog li cais cov quab yuam ib txwm ntawm ib sab thaum xam cov coefficient ntawm kev sib txhuam thiab kev sib txhuam kinetic ntawm lwm qhov.
- Piv txwv: Nrhiav qhov quab yuam ib txwm muaj yog tias qhov coefficient ntawm kev sib txhuam yog 0.4 thiab qhov loj ntawm kev sib txhuam kinetic yog 40 N.
Kauj Ruam 3. Sib faib cov kinetic txhuam los ntawm cov coefficient ntawm kev sib txhuam
Yeej, qhov no yog txhua yam koj yuav tsum tau ua txhawm rau nrhiav qhov loj ntawm lub zog ib txwm muaj.
Piv txwv: N = f / = 40 /0, 4 = 100
Kauj Ruam 4. Sau koj cov lus teb
Yog tias xav tau, koj tuaj yeem tshawb xyuas koj cov lus teb los ntawm kev ntsaws nws rov qab rau hauv qhov sib npaug qub rau kev sib txhuam kinetic. Yog tias koj tsis xav tau, koj tau daws qhov teeb meem.
