Kukangana kosasinthasintha ndi mphamvu yokangana yomwe imagwira ntchito pamwamba pa zinthu zomwe zikukhudzana wina ndi mnzake pamene zinthuzo sizikuyenda.
Gambar 1 ikuwonetsa chinthu chomwe chidakali pamalo athyathyathya chikukokedwa ndi mphamvu F. Ngati chinthucho sichikuyenda ndiye fs yaying'ono kuposa mphamvu yokoka (F). Ngati mphamvu yokoka yawonjezeka, chinthucho chidzasuntha. Chinthucho chikangotsala pang'ono kusuntha, kukula kwa f kumakhala kwakukulu kuposas wofanana ndi kukula kwa mphamvu yokoka (F).
Lamulo Loyamba la Newton limati chinthu chimakhala pamalo ake ngati mphamvu kapena mphamvu yonse yomwe yabwera ndi yofanana ndi zero.
Ngati mukufuna kudziwa kuchuluka kwa static friction coefficient, gwiritsani ntchito equation 1.1 b
Pamene chinthucho chikuyamba kusuntha, kukula kwake mphamvu yayikulu yokangana yokhazikika mofanana ndi kukula kwa mphamvu yokankhira kapena kukoka.
Chitsanzo cha mavuto.
1. Chipika cha 1 kg choyikidwa pamalo athyathyathya chimakokedwa pogwiritsa ntchito dynamometer (chida choyezera mphamvu). Chipikacho chikatsala pang'ono kusuntha, dynamometer imawerenga ma Newton awiri. Kuthamanga chifukwa cha mphamvu yokoka = 10 m/s2Dziwani (a) kukula kwa mphamvu ya kukangana (b) kuchuluka kwa kukangana
Zokambirana
Ndizodziwika kuti :
Kulemera kwa chipika (m) = 1 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s2
Kulemera kwa chipika (w) = mg = (1 kg)(10 m/s2) = 10 kg m/s2 = 10 Newton
Mphamvu yokoka (F) = 2 Newton
Yankhani :
(a) Kukula kwa mphamvu yokangana yosasinthasintha (f)s)
Pamene chipikacho chatsala pang'ono kusuntha, kukula kwa mphamvu yosasunthika yolimbana = kukula kwa mphamvu yogwirana (yerekezerani ndi equation 1.4).
Kotero mphamvu yokangana yosasinthasintha (f)s) = mphamvu yokoka (F) = 2 Newton
(b) Chokwanira cha kukangana kosasinthasintha
