Malangizo Oyesera Kukangana Kosasunthika ndi Kinetic
Mutu wa kuyesera: Kukangana kosasinthasintha ndi kukangana kwa kinetic
Zolinga za kuyesera:
- Kudziwa mphamvu yokhazikika yokangana
- Kudziwa mphamvu ya kinetic friction
Zida ndi zipangizo: Dynamometer, kuwala yaying'ono.
Chiphunzitso choyambira:
Mphamvu Yokangana
Kukangana ndi mphamvu yotsutsa yomwe imagwira ntchito pakati pa zinthu zomwe zakhudzana. Munkhaniyi, kukangana komwe kwaphunziridwa kukugwirizana ndi mphamvu yokangana yomwe imagwira ntchito pakati pa zinthu ziwiri zolimba zomwe zakhudzana.
Mphamvu yokangana pa chinthu choyenda nthawi zonse imakhala yosiyana ndi njira yoyendera chinthucho.
Pali mitundu iwiri ya kukangana: kukangana kosasinthasintha (fs ) ndi kukangana kosasinthasintha (f k ). Kukangana kosasinthasintha kumagwira ntchito pamene chinthu chikuyendabe, pomwe kukangana kosasinthasintha kumagwira ntchito pamene chinthu chikuyenda. Ngati mutakankhira tebulo koma likusunthabe, mphamvu yokangana yomwe imagwira ntchito pa tebulo losasuntha ndi kukangana kosasinthasintha. Mosiyana ndi zimenezi, pamene tebulo likusuntha, mphamvu yokangana yomwe imagwira ntchito pa tebulo ndi kukangana kosasinthasintha.
Mphamvu Yokangana Yosasunthika
Kukangana kosasinthasintha ndi mphamvu yokangana yomwe imagwira ntchito pamwamba pa zinthu zomwe zikukhudzana wina ndi mnzake pamene zinthuzo sizikuyenda.
f s = μ s N
Lamulo Loyamba la Newton limati chinthu chimakhala chili pampando ngati mphamvu yonse (mphamvu yotuluka) ili yofanana ndi zero.
ΣF x = 0
F – f s = 0
F = fs
Chinthu chikatsala pang'ono kusuntha (chinthucho chikadali chosasunthika), mphamvu yayikulu yokankhira yosasunthika imakhala yofanana ndi mphamvu yokankhira kapena kukoka.
Mphamvu Yokangana ya Kinetic
Kukangana kwa kinetic ndi mphamvu yokangana yomwe imagwira ntchito pamwamba pa zinthu zomwe zikukhudzana wina ndi mnzake pamene zinthuzo zikuyenda.
f k = μ k N
Lamulo Loyamba la Newton limati chinthu chimayenda pa liwiro losasintha ngati mphamvu yonse (mphamvu yotuluka) ndi yofanana ndi zero.
F – f k = 0
F = f k
Chinthu chikayenda pa liwiro losasintha, kukula kwa mphamvu ya kinetic friction kumakhala kofanana ndi kukula kwa mphamvu yokankhira kapena kukoka.
Masitepe oyesera:
1. Ikani chipikacho pamalo athyathyathya.
2. Lumikizani dynamometer ku block
3. Kokani dynamometer mpaka chipikacho chitatsala pang'ono kusuntha.
4. Werengani kukula kwa mphamvu yomwe yasonyezedwa ndi dynamometer, lembani mu gawo la mphamvu yosasunthika.
5. Kokani dynamometer mpaka chipikacho chizisuntha pa liwiro losasintha.
6. Werengani kukula kwa mphamvu yomwe yasonyezedwa ndi dynamometer, ilembeni mu gawo la mphamvu ya kinetic friction.
7. Bwerezani kuyesera katatu
Kusanthula Deta ndi Deta:
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Ayi
Mphamvu yosasunthika yokangana ( fs )
Mphamvu ya kukangana kwa kinetic (f k )
1
2
3
Avereji
Yankhani mafunso otsatirawa:
Ndi chiyani chachikulu, static friction kapena kinetic friction? Chifukwa chiyani?
Mapeto
Fotokozani mfundo yanu.
