Nā Kuhikuhi Hoʻokolohua Kūpaʻa a me Kinetic
Kumuhana hoʻokolohua: Ka haʻalulu paʻa a me ka haʻalulu kinetic
Nā Pahuhopu o ka hoʻokolohua:
- Ke ʻike nei i ka ikaika friction static
- Ke ʻike nei i ka ikaika friction kinetic
Nā mea hana a me nā mea hana: Dynamometer, kukuna liʻiliʻi.
Kumumanaʻo kumu:
Ka ikaika o ka haʻalulu
ʻO ka haʻalulu ka ikaika kū'ē e hana ana ma waena o nā ʻili o nā mea e pili ana. Ma kēia kumuhana, pili ka haʻalulu i aʻo ʻia i ka ikaika haʻalulu e hana ana ma waena o ʻelua mau ʻili paʻa e pili ana.
Aia mau ka ikaika frictional ma luna o kahi mea e neʻe ana ma ke kuhikuhi ʻē aʻe i ke kuhikuhi o ka neʻe ʻana o ka mea.
ʻElua ʻano o ka friction: ka friction static (fs ) a me ka friction kinetic (fk ) . Hana ka friction static i ka wā e neʻe mau ana kahi mea, ʻoiai hana ka friction kinetic i ka wā e neʻe ana kahi mea. Inā ʻoe e paʻi i kahi papaʻaina akā e neʻe mau ana, ʻo ka ikaika friction e hana ana ma ka papaʻaina paʻa he friction static. I ka ʻaoʻao ʻē aʻe, i ka wā e neʻe ana ka papaʻaina, ʻo ka ikaika friction e hana ana ma ka papaʻaina he friction kinetic.
Ka ikaika haʻalulu paʻa
ʻO ka friction static ka ikaika friction e hana ana ma luna o nā ʻili o nā mea e pili ana kekahi i kekahi ke neʻe ʻole nā mea.
fs = μsN
ʻŌlelo ke Kānāwai Mua o Newton ua hoʻomaha kahi mea inā like ka ikaika holoʻokoʻa (ka ikaika hopena) me ka ʻole.
ΣF x = 0
F – fs = 0
F = fs
Ke kokoke e neʻe kahi mea (e kū mau ana ka mea), ua like ka ikaika friction static kiʻekiʻe loa me ka ikaika paʻi a huki paha.
Ka ikaika kuʻi kinetic
ʻO ka friction kinetic ka ikaika friction e hana ana ma luna o nā ʻili o nā mea e pili ana kekahi i kekahi ke neʻe nā mea.
f k = μ k N
ʻŌlelo ke Kānāwai Mua o Newton e neʻe ana kahi mea i ka wikiwiki mau inā like ka ikaika holoʻokoʻa (ka ikaika hopena) me ka ʻole.
F – f k = 0
F = fk
Ke neʻe kahi mea i ka wikiwiki mau, ua like ka nui o ka ikaika friction kinetic me ka nui o ka ikaika paʻi a huki paha.
Nā ʻanuʻu hoʻokolohua:
1. E kau i ka poloka ma luna o kahi pālahalaha.
2. E hoʻohui i ka dynamometer i ka poloka
3. E huki i ka dynamometer a hiki i ka neʻe ʻana o ka poloka.
4. E heluhelu i ka nui o ka ikaika i hōʻike ʻia e ka dynamometer, e hoʻopaʻa iā ia ma ke kolamu ikaika friction static.
5. E huki i ka dynamometer a neʻe ka poloka i ka wikiwiki mau.
6. E heluhelu i ka nui o ka ikaika i hōʻike ʻia e ka dynamometer, e hoʻomaopopo iā ia ma ke kolamu o ka ikaika friction kinetic.
7. E hana hou i ka hoʻokolohua i 3 mau manawa
ʻIkepili a me ka ʻIkepili:
-
ʻAʻole
Ka ikaika kuʻi paʻa ( fs )
Ka ikaika kuʻi kinetic (f k )
1
2
3
ʻAwelike
E pane i nā nīnau aʻe:
ʻO wai ka mea nui, ka haʻalulu paʻa a i ʻole ka haʻalulu kinetic? No ke aha mai?
Ka hopena
E haʻi i kāu hopena.
