Zitsanzo ziwiri za kugwiritsa ntchito malamulo a Newton pa chingwe ndi makina onyamula katundu
1. Kulemera kwa chipika 1 ndi 2 kg, kulemera kwa chipika 2 ndi 3 kg, kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s2Dziwani (a) kukula ndi komwe dongosolo likufulumizitsa (b) kukula kwa mphamvu yogwira chingwe!
Zokambirana
Zitsanzo 4 za mafunso okhudza kugwiritsa ntchito malamulo a Newton poyendetsa bwino lift kapena elevator
1. Munthu wolemera makilogalamu 50 ali mu elevator. Kuthamanga chifukwa cha mphamvu yokoka = 10 m/s2Dziwani kukula kwa mphamvu yachibadwa yomwe pansi pa elevator imagwiritsira ntchito pa munthuyo ngati:
(a) chikepe chopanda phokoso
(b) elevator imatsika pansi pa liwiro losasintha
(c) chikepicho chimakwera mmwamba ndi liwiro la 5 m/s2
(d) chikepicho chimatsika ndi liwiro la 5 m/s2
(e) elevator yogwa kwaulere
Zitsanzo ziwiri za kugwiritsa ntchito malamulo a Newton panjira yosalala (yopanda kukangana)
1. Kulemera kwa chipikacho ndi 2 kg, kuthamanga chifukwa cha mphamvu yokoka = 10 m/s2Dziwani (a) mphamvu yochokera yomwe imafulumizitsa chipikacho (b) kukula kwa kuthamanga kwa chipikacho.
Zokambirana
Zitsanzo ziwiri za kugwiritsa ntchito malamulo a Newton pa malo otsetsereka (pali kukangana)
1. Kulemera kwa chipikacho ndi 2 kg, kuthamanga chifukwa cha mphamvu yokoka = 10 m/s2, coefficient ya static ndi kinetic friction ndi 0,2 ndi 0,1. Kodi block ili chikhalire kapena ikuyenda? Ngati block ikuyenda, dziwani (a) mphamvu yomwe imachokera yomwe imafulumizitsa block (b) kukula ndi komwe block ikuyenda!
Zokambirana
Lamulo losunga mphamvu yolunjika amanena kuti ngati palibe mphamvu yakunja yomwe ikugwira ntchito pa zinthu ziwiri zomwe zikugundana ndiye kuti patsogolo chinthu chisanachitike kugundana ndi chimodzimodzi ndi mphamvu ya chinthucho pambuyo pa kugundana.
Zambiri:
m1 = kulemera kwa chinthu 1, m2 = kulemera kwa chinthu 2
Zinthu Zogundana Zopanda Kutupa
Pa kugundana pang'ono (kugundana kosalala kopanda ungwiro), lamulo losunga mphamvu ya mphamvu limagwira ntchito , pomwe lamulo losunga mphamvu ya kinetic siligwira ntchito. Pa kugundana, mphamvu ina ya kinetic imasinthidwa kukhala mphamvu yamphamvu, mphamvu ya kutentha, ndi mphamvu yamkati. Kugwiritsa ntchito mawu oti elastic kumasonyeza kuti pambuyo pa kugundana, zinthu ziwirizi sizimalumikizana kukhala chimodzi kapena kumamatirana, koma m'malo mwake zimadumphadumpha. Chitsanzo cha kugundana kosalala kopanda ungwiro ndi kugundana kwa mbali imodzi pakati pa mabulo awiri kapena mipira iwiri ya biliyadi.
Kugundana pakati pa zinthu kumatchedwa kugongana kosalala bwino ngati mphamvu ya mphamvu ya mphamvu ya chinthu chilichonse chisanachitike kugundana zili zofanana ndi mphamvu ya mphamvu ya mphamvu ya mphamvu ya chinthu chilichonse chitatha kugundana. Mwanjira ina, mu kugundana kosalala bwino, lamulo losunga mphamvu ya mphamvu ndi lamulo losunga mphamvu ya mphamvu ya mphamvu ya mphamvu limagwira ntchito. Kugwiritsa ntchito mawu oti elastic kumasonyeza kuti pambuyo pa kugundana, zinthu ziwirizi sizimalumikizana kukhala chimodzi kapena sizimamatirana koma zimadumphadumpha.
Pa kugundana pang'ono (kugundana kosalala kopanda ungwiro), lamulo losunga mphamvu ya mphamvu limagwira ntchito , pomwe lamulo losunga mphamvu ya kinetic siligwira ntchito. Pa kugundana, mphamvu ina ya kinetic imasinthidwa kukhala mphamvu yamphamvu, mphamvu ya kutentha, ndi mphamvu yamkati. Kugwiritsa ntchito mawu oti elastic kumasonyeza kuti pambuyo pa kugundana, zinthu ziwirizi sizimalumikizana kukhala chimodzi kapena kumamatirana, koma m'malo mwake zimadumphadumpha. Chitsanzo cha kugundana kosalala kopanda ungwiro ndi kugundana kwa mbali imodzi pakati pa mabulo awiri kapena mipira iwiri ya biliyadi.
1. Kulemera (w)
Mphamvu yokoka, kapena nthawi zambiri imafupikitsidwa ngati kulemera, ndi mphamvu yokoka yomwe imagwira ntchito pa chinthu chokhala ndi kulemera. Chizindikiro cha mphamvu yokoka ndi w, chomwe chimayimira kulemera.
Fomula yowerengera mphamvu yokoka imachokera ku fomula Lamulo lachiwiri la Newton :
F = ma
Kugwiritsa ntchito powerengera mphamvu yokoka:
w = mg
Keterangan :
F = mphamvu (gawo lapadziko lonse lapansi = Newton)
w = mphamvu yokoka (gawo lapadziko lonse lapansi = Newton)
m = kulemera kwa chinthu (mayunitsi apadziko lonse lapansi = kg)
ku = kufulumizitsa (gawo lapadziko lonse lapansi = m/s2)
g = kuthamanga chifukwa cha mphamvu yokoka (mayunitsi apadziko lonse lapansi = m/s2)
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.