1. Tanthauzo la kalembedwe
Mphamvu ndi chinthu chomwe chimapangitsa zinthu kukumana nazo kufulumizitsaMwa kuyankhula kwina, mphamvu ndi chinthu chomwe chimayenda, chimayimitsa kapena kusintha njira yoyendera chinthu.
Kalembedwe ndi kuchuluka kwa vekitala Chifukwa chake, mphamvu ili ndi kukula ndi chitsogozo. Chizindikiro cha mphamvu ndi F (Mphamvu). F ndi chizindikiro chachikulu cha mphamvu. Pali mitundu ingapo ya mphamvu, ndipo si mitundu yonse ya mphamvu yomwe ili ndi chizindikiro F. Gawo la mphamvu yapadziko lonse lapansi ndi kg m/s2 wotchedwanso Newton.
2. Kumvetsetsa mphamvu yonse kapena mphamvu yochokerapo
Mphamvu yonse kapena mphamvu yochokerapo ndi chiwonkhetso cha mphamvu zonse zomwe zikugwira ntchito pa chinthu. Mphamvu ndi kuchuluka kwa vekitala, chifukwa chake mphamvu yonse imawerengedwa pogwiritsa ntchito lamulo lowonjezera vekitala.
Chitsanzo cha mavuto.
1.
Mphamvu yonse = 10 Newton, komwe mphamvu yonse ikupita kuli kumanja.
2.
Mphamvu yonse = 8 Newton, komwe mphamvu yonse ikupita kuli kumanja
3.
Mphamvu yonse = 0
4.
Mphamvu yonse = 0
5. Ngati unyinji wa zinthuzo ndi wofanana, ndiye kuti chinthu chomwe chili ndi liwiro lalikulu ndi...
Zokambirana
Lamulo Lachiwiri la Newton limati kukula kwa kuthamanga kwa chinthu kumayenderana ndi kukula kwa mphamvu ndipo motsutsana ndi kulemera kwa chinthucho. Kulunjika kwa kuthamanga kapena njira yoyendera kwa chinthucho kumayenderana ndi njira ya mphamvu yochokerapo yomwe ikugwira ntchito pa chinthucho.
Kapangidwe ka masamu ka lamulo lachiwiri la Newton: a = F / m
Kuthamanga kwa mphamvu kumayenderana ndi mphamvu, choncho chinthu chomwe chimathamanga kwambiri ndi chinthu chomwe mphamvu yayikulu kwambiri imagwira ntchito.
Kalembedwe ndi kuchuluka kwa vekitala Chifukwa chake, kuwonjezera mphamvu kumasinthidwa malinga ndi malamulo owonjezera kuchuluka kwa vekitala. Ngati mphamvu zili pamzere wowongoka, ndiye kuti mphamvu zomwe zili mbali imodzi zimawonjezedwa ndipo mphamvu zomwe zili mbali inayo zimachotsedwa.
A –> Mphamvu yochokera = 5 + 2 + 3 = 10 Newtons (njira ya mphamvu kumanja)
B –> Mphamvu yochokera = 3 + 5 – 2 = 6 Newtons (njira ya mphamvu kumanja)
C –> Mphamvu yochokera = 5 – 12 – 3 = -10 Newton (njira ya mphamvu kumanzere)
D –> Mphamvu yochokera = 3 – 5 – 12 = -14 Newton (njira ya mphamvu kumanzere).
Zizindikiro zabwino ndi zoyipa zimangofotokoza komwe mphamvu yochokera ikupita. Mphamvu yochokera Chizindikiro chabwino chimatanthauza kuti mphamvu yochokera ku chinthucho ili kumanja (chinthucho chikupita kumanja) ndipo chizindikiro chotsutsa chimatanthauza kuti mphamvu yochokera ku chinthucho ili kumanzere (chinthucho chikupita kumanzere).
Yankho lolondola ndi D.
6. Ngati zinthu zotsatirazi zili ndi kulemera kofanana, ndiye chithunzi chiti chomwe chili ndi liwiro laling'ono kwambiri?
Zokambirana
Kulemera kwa chinthu ndi chimodzimodzi, motero kuthamanga pang'ono kumakhala ndi chinthu chomwe mphamvu yaying'ono kwambiri imagwira ntchito.
A –> Mphamvu yochokera = 8 + 15 – 10 = 13 Newtons (njira ya mphamvu kumanja)
B –> Mphamvu yochokera = 10 + 8 – 5 = 13 Newtons (njira ya mphamvu kumanja)
C –> Mphamvu yochokera = 2 + 5 – 3 = 4 Newtons (njira ya mphamvu kumanja)
D –> Mphamvu yochokera = 8 + 4 – 5 = 7 Newtons (njira ya mphamvu kumanja)
Yankho lolondola ndi C.
7. Zinthu zinayi zofanana zimagonjetsedwa ndi mphamvu zingapo nthawi imodzi monga momwe zasonyezedwera pachithunzi chotsatirachi. Ndi chinthu chiti chomwe chimakumana ndi kuthamanga pang'ono kwambiri?
Zokambirana
Kulemera kwa chinthu ndi chimodzimodzi, motero kuthamanga pang'ono kumakhala ndi chinthu chomwe mphamvu yaying'ono kwambiri imagwira ntchito.
A –> Mphamvu yochokera = 35 + 30 – 25 = 40 Newtons (njira ya mphamvu kumanja)
B –> Mphamvu yochokera = 15 + 25 – 45 = -5 Newton (njira ya mphamvu kumanzere)
C –> Mphamvu yochokera = 55 – 30 – 40 = -15 Newton (njira ya mphamvu kumanzere)
D –> Mphamvu yochokera = 50 + 10 – 40 = 20 Newtons (njira ya mphamvu kumanja)
Yankho lolondola ndi B.
8. Kulunjika ndi zotsatira za mphamvu yomwe ili pachithunzichi kumbali ndi...
A. 2 N kulowera ku Tono
B. 2 N kulowera ku Irham
C. 282 N kulowera ku Tono
D. 282 N kulowera ku Irham
Zokambirana
Kupsompsona mphamvu yochokera :
ΣF = 142 N – 140 N
ΣF = 2 Newton
Kulunjika kwa mphamvu yochokerapo = kulunjika kwa mphamvu 142 Newton = kupita ku Tono, chifukwa 142 Newton ndi wamkulu kuposa 140 Newton
Yankho lolondola ndi A.
9. Yang'anani chithunzi chotsatirachi!
Umar ndi Amir akukoka mbali zosiyana. Ngati mphamvu ya Umar ili 25 N ndipo mphamvu ya Amir ili 20 N, ndiye kuti zotsatira za mphamvu ziwirizi ndi...
A. 5 Newton
B. 20 Newton
C. 25 Newton
D. 45 Newton
Zokambirana
Mphamvu yochokera = 25 N – 20 N = 5 Newtons
Yankho lolondola ndi A.
