Mu phunziro lapitalo la fizikisi, tinaphunzira mitu ya mphamvu za tinthu ndi mphamvu zozungulira . Mu mphamvu za tinthu, tinaphunzira tinthu mu kayendedwe komasulira ( kuyenda kozungulira , kuyenda kozungulira , kuyenda kwa parabolic ). Mu mphamvu zozungulira, tinaphunzira matupi olimba ozungulira. Mu mutu uwu, tinaphunzira zinthu mu mgwirizano. Pali mitundu iwiri ya mgwirizano, womwe ndi mgwirizano wokhazikika ndi mgwirizano wosinthasintha. Malinga ndi lamulo loyamba la Newton, chinthu chimakhala mu mgwirizano wokhazikika ngati chinthucho chili pamalo opumulira ndipo chinthu chili mu mgwirizano wosinthasintha ngati chinthucho chikuyenda pa liwiro lokhazikika. Pepalali likuyang'ana kwambiri pakukambirana za mgwirizano wokhazikika (zinthu zokhazikika).
Lingaliro la kukhazikika kwa thupi ndi chidziwitso chofunikira kwambiri ndipo limagwiritsidwa ntchito kwambiri pa moyo watsiku ndi tsiku, makamaka pankhani ya uinjiniya. Kumvetsetsa ndikuwerengera mphamvu zomwe zimagwira ntchito pa chinthu chomwe chili mu mkhalidwe wa kukhazikika kwa thupi ndikofunikira kwambiri, makamaka kwa akatswiri aukadaulo (omanga nyumba kapena mainjiniya). Popanga chinthu, kaya nyumba, mlatho, galimoto, ndi zina zotero, akatswiri omanga nyumba kapena mainjiniya amawerengera mosamala ngati kapangidwe ka nyumba, galimoto, mlatho, ndi zina zotero, kangathe kupirira mphamvu zomwe zikugwira ntchito pa icho kuti chisagwe.
Chitsanzo cha mavuto
1. Taganizirani chithunzi chotsatirachi! Ndodo yolemera makilogalamu 1,5 imakhala yolunjika kukhoma kumapeto kwake, ndipo nyali imapachikidwa patali pang'ono kuchokera ku hinge. Kukakamira kwa chingwe kuti ndodoyo ikhale yofanana ndi…
Zokambirana
Ndizodziwika kuti:
Kulemera kwa katundu (m1 ) = 2 kg
Kulemera kwa ndodo (m2 ) = 1,5 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s 2
Kulemera kwa katundu (w)1) = (2)(10) = 20 Newton
Kulemera kwa bala (w 2 ) = (1,5)(10) = 15 N
Funso: Kukula kwa mphamvu ya chingwe kotero kuti ndodoyo ili bwino
Yankho:
Kutalika kwa chingwe kumawerengedwa pogwiritsa ntchito njira ya Pythagorean:
Werengerani mphamvu ya chingwe (T ):
Sankhani mzere wozungulira pa hinge. Ganizirani nthawi yomwe mphamvu ikugwira ntchito pa ndodo.
Mphamvu Yoyamba:
τ 1 = w 2 r 2 = (15 N) (0,4 m) = -6 Nm
Mphamvu ya mphindi 1 imapangitsa kuti ndodo izungulire mozungulira wotchi kotero kuti mphamvu ya mphindi 1 imakhala ndi chizindikiro choyipa.
Mphamvu Yoyamba:
τ 2 = w 1 r 1 = (20 N) (0,6 m) = -12 Nm
Mphamvu ya mphindi 2 imapangitsa kuti ndodo izungulire mozungulira wotchi kotero kuti mphamvu ya mphindi 1 imakhala ndi chizindikiro choyipa.
Mphamvu Yoyamba:
τ 3 = T r 3 tchimo θ = (T) (0,8) (0,6/1) = 0,48T
Mphamvu ya mphindi 3 imapangitsa kuti ndodoyo izizungulira mozungulira wotchi kotero kuti mphamvu ya mphindi 3yo ili ndi chizindikiro chabwino.
Kuti dongosolo likhale losasunthika, mphindi yotsatira ya mphamvu ( Στ) = 0
Στ = 0
τ 1 + τ 2 + τ 3 = 0
– 6 – 12 + 0,48T = 0
– 18 + 0,48T = 0
0,48T = 18
T = 18/ 0,48
T = 37,5 Newtons
Gwero la funso:
Mafunso a National Examination Physics a Senior High School/Vocational High School
