Zitsanzo 9 za Mafunso a Malamulo a Hooke
1. Chithunzi cha ubale pakati pa mphamvu (F) ndi kutalika kwa (x) chikuwonetsedwa pachithunzi chili pansipa. Chokhazikika cha masika chozikidwa pa graph ndi…
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Fomula Lamulo la Hooke :
k = F / x
Zambiri:
F = mphamvu (gawo lapadziko lonse ndi Newton, chidule N)
k = nthawi zonse ya masika (gawo lapadziko lonse lapansi ndi Newton/mita, chidule N/m)
x = kuwonjezeka kwa kutalika (gawo lapadziko lonse ndi mamita, chidule m)
1. Mpira A ndi mpira B, uliwonse wokhala ndi kulemera kwa magalamu 200, wagundana bwino kwambiri. Ngati mpira A ukuyenda pa liwiro la 10 m/s usanagundane ndipo mpira B uli pamalo opumulira, ndiye kuti liwiro la mpira A ndi mpira B pambuyo pa kugundana ndi...
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Ndizodziwika kuti :
Unyinji wa mpira A (mA) = magalamu 200 = 0,2 kg
Kulemera kwa mpira B (mB) = magalamu 200 = 0,2 kg
Liwiro la mpira A lisanafike kugundana (v)A) = 10 m/s
Liwiro la mpira B lisanafike kugundana (v)B= = 0
1. Chipolopolo cholemera magalamu 30 chikuyenda pa liwiro la 30 m/s chikugunda chipika chamatabwa cholemera makilogalamu 1 chomwe chili pamalo opumulira. Dziwani liwiro la chipikacho ngati chipolopolocho chili mu chipikacho!
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Ndizodziwika kuti :
Kulemera kwa chipolopolo (m1) = magalamu 30 = 0,03 kg
Kulemera kwa chipika (m2) = 1 kg
Liwiro loyamba la chipolopolo (v)1) = 30 m/s
Liwiro loyambirira la chipika (v)2) = 0 (malo osasinthasintha)
Anafunsa : liwiro la chipolopolo ndi chipika pambuyo pa kugundana (v')
Zitsanzo zitatu za kugundana pang'ono
1. Chinthu cha magalamu 500 chimayenda pa liwiro la 10 m/s ndipo chinthu cha magalamu 200 chimayenda pa liwiro la 12 m/s. Zinthu ziwirizi zimayenda moyandikana ndipo zigundana. Ngati pambuyo pa kugundana, liwiro la chinthu cha magalamu 500 ndi 6 m/s, ndiye kuti liwiro la chinthu cha magalamu 200 ndi…
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Ndizodziwika kuti :
Kulemera kwa chinthu 1 (m1) = magalamu 500 = 0,5 kg
Kulemera kwa chinthu 2 (m2) = magalamu 200 = 0,2 kg
Liwiro loyambirira la chinthu 1 (v)1) = -10 m/s
Liwiro loyambirira la chinthu 2 (v)2) = 12 m/s
Liwiro lomaliza la chinthu 1 (v)1') = 6 m/s
Zitsanzo 8 za Mafunso Okhudza Kuthamanga kwa Mzere
1. Chinthu cholemera makilogalamu 1 chimayenda pa liwiro la 10 m/s. patsogolo chinthucho ndi…
Zokambirana
Ndizodziwika kuti :
Kulemera (m) = 1 kg
Liwiro (v) = 10 m/s
Anafunsa : mzere wolunjika (p)
Yankhani :
Fomula ya mphamvu: p = mv
Kufotokozera: p = mphamvu, m = kulemera, v = liwiro.
Mphamvu ya chinthu ndi:
p = mv = (1)(10) = 10 kg m/s2
Zitsanzo 11 za Mafunso Okhudza Mphamvu ndi Kusakhazikika
1. Mpira wolemera makilogalamu 0,2 umaponyedwa mopingasa pa liwiro la 10 m/s ndipo umagunda khoma, kenako mpirawo umabwerera mmbuyo pa liwiro lomwelo. Kusintha kwa mphamvu ya mpira ndi...
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Zitsanzo 16 za Mafunso Okhudza Lamulo Losunga Mphamvu Zamakina
Lamulo losunga mphamvu zamakanika mu kayendedwe ka kugwa kwaulere
1. Kokonati yolemera makilogalamu awiri imagwa momasuka kuchokera kutalika kwa mamita 6. Mphamvu ya kayendedwe ka kokonati ikafika pansi ndi… g = 10 m/s2
Zokambirana
Ndizodziwika kuti :
Unyinji wa kokonati (m) = 2 kg
Kutalika (h) = mamita 6
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s2
Anafunsa mphamvu ya kinetic (EK)
2 Zitsanzo za mafunso okhudza mphamvu
Mphamvu ndi liwiro limene ntchito imagwiridwa usa kapena khama lopangidwa mkati mwa nthawi inayake.
Mwachidule, mphamvu ndi chiŵerengero cha khama ndi nthawi.
P = W / t
Kufotokozera: P = mphamvu (gawo Joule/sekondi), W = ntchito (Joule) ndi t = nthawi yopuma (sekondi)
Kutengera ndi equation iyi, zitha kutsimikiziridwa kuti liwiro lomwe ntchito ikuchitika ndi lalikulu, mphamvu imakhala yayikulu, mosiyana, liwiro lomwe ntchito ikuchitika ndi lochepa, mphamvu imakhala yochepa.
Mphamvu ndi kuchuluka kwa scalar. Dongosolo lapadziko lonse la mayunitsi a mphamvu ndi joule/sekondi. Joule/sekondi = watt (chidule cha W), chotchedwa polemekeza James Watt.
Dongosolo la mphamvu la Britain ndi mphamvu ya paundi imodzi-phazi pa sekondi. Gawoli ndi laling'ono kwambiri kuti ligwiritsidwe ntchito, kotero gawo lalikulu, mphamvu ya mahatchi (mwachidule hp), limagwiritsidwa ntchito. Mphamvu ya mahatchi imodzi = mphamvu ya mahatchi 550 paundi-phazi pa sekondi = ma watts 764 = ¾ kilowatt.
1. Kasupe amapatsidwa katundu wa makilogalamu awiri ndipo amapachikidwa moyimirira pa choyimilira. Ngati kasupeyo amatalika ndi masentimita 4, ndiye kuti kusintha kwa mphamvu zomwe zingatheke Mphamvu yotanuka ya kasupe ndi… g = 10 m/s2
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Ndizodziwika kuti :
Kulemera kwa katundu (m) = 2 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s2
Kulemera kwa katundu (w) = mg = (2)(10) = 20 Newton
Kuwonjezeka kwa kutalika kwa kasupe (x) = 4 cm = 0,04 mamita
Anafunsa : Mphamvu yolimba ya masika
1. Chinthu cholemera makilogalamu 1 chimagwa momasuka kuchokera kutalika kwa mamita 10 mpaka chikafika pansi. Dziwani izi:
(a) Ntchito yochitidwa ndi mphamvu yokoka pa chinthucho
(b) Zosintha mphamvu zomwe zingatheke mphamvu yokoka
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s2
Zokambirana
Ndizodziwika kuti :
Kulemera kwa chinthu (m) = 1 kg
Kutalika (h) = mamita 10
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s2
Yankho:
(a) Ntchito yochitidwa ndi mphamvu yokoka
Chinthu chikagwa momasuka, njira yoyendera ya chinthucho imakhala pansi ndipo njira ya mphamvu yokoka yomwe ikugwira ntchito pa chinthucho (kulemera kwa chinthucho) nayonso imakhala pansi. Chifukwa chakuti zili mbali imodzi, mphamvu yokoka imagwirizana kapena kupanga ngodya ya 0.o ndi malangizo a kayendetsedwe ka chinthucho. Cos 0 = 1 ndipo nambala iliyonse yochulukitsidwa ndi 1 ndi yofanana ndi nambala imeneyo, kotero cos 0 sikuyenera kuphatikizidwa mu fomula yogwirira ntchito.
Fomula yogwirira ntchito ndi W = F s, pomwe W = ntchito, F = mphamvu ndi s = kusamuka. Ngati yasinthidwa kuti igwirizane ndi vutoli, fomula yogwirira ntchito imasintha kukhala W = wh = mgh, pomwe W = ntchito, w = mphamvu yokoka, h = kusintha kwa kutalika kwa chinthucho, m = kulemera kwa chinthucho, g = kuthamanga chifukwa cha mphamvu yokoka.
Kotero ntchito yochitidwa ndi mphamvu yokoka ndi iyi:
W = wh = mgh = (1)(10)(10) = 100 Joules