Laʻana o nā nīnau ikaika frictional

6 mau laʻana o nā nīnau no ka ikaika frictional

1. Aia kahi poloka me ke kaumaha o 1 kg ma luna o kahi ʻili pālahalaha ʻinoʻino. ʻO ke koina o ka friction static he 0,4 a ʻo ka wikiwiki ma muli o ke koʻikoʻi he 10 m/s.²E hoʻoholo (a) i ka nui o ka ikaika friction static (b) i ka ikaika tensile liʻiliʻi loa F i hoʻomaka ai ka poloka e neʻe!
Pahana
Ua ʻike ʻia :
Ua nīnau ʻia :
(a) Ka nui o ka ikaika kuʻi paʻa (b) Ka nui o ka ikaika tensile liʻiliʻi loa (F)
Pane :
(a) ʻO ka nui o ka ikaika friction static (f_s)
(B) Ka ikaika tensile haʻahaʻa loa (F)
Inā huki ʻia kahi mea me ka ikaika F akā e hoʻomaha ana ka mea, a laila ke hana nei ka haʻalulu paʻa ma luna o ka mea. Inā huki ʻia kahi mea me ka ikaika F a ke neʻe nei ka mea, a laila ke hana nei ka haʻalulu kinetic ma luna o ka mea. Hoʻopaʻa ka haʻalulu paʻa i ka neʻe ʻana o ka mea a e like me ka mea i hōʻike ʻia ma ke kiʻi, ʻo ke kuhikuhi o ka haʻalulu paʻa e kūʻē i ke kuhikuhi o ka ikaika tensile (F). Ke like ka nui o ka ikaika tensile (F) me ka ikaika haʻalulu paʻa, a laila e neʻe ka mea (noho ka mea i ka hoʻomaha). Hoʻomaka ka mea e neʻe i ka wā e ʻoi aku ka nui o ka ikaika tensile ma mua o ka ikaika haʻalulu paʻa.
No laila, ʻo ka ikaika tensile liʻiliʻi loa (F) no ka poloka e hoʻomaka ai e neʻe he 4 Newtons.

2. Ua huki ʻia kahi poloka me ke kaumaha o 1 kg i kau ʻia ma luna o kahi ʻili pālahalaha ʻino me ka ikaika F i ke ʻano e neʻe ai ka poloka ma kahi laina pololei ma ka wikiwiki mau. Inā ʻo ke koina o ka friction kinetic he 0,1. E hoʻoholo i ka nui o ka ikaika huki F! (g = 10 m/s²)  
Pahana
Ua ʻike ʻia :
Ua nīnau ʻia : F
Pane :
ʻO kahi poloka e neʻe ana ma kahi laina pololei ma ka wikiwiki mau = kahi poloka e neʻe ana ma ka wikiwiki mau = kahi poloka e neʻe ana me ka ʻole o ka hoʻolalelale. ʻŌlelo ke Kānāwai Mua o Newton inā ʻo ka hopena o ka ikaika e hana ana ma kahi mea = 0 a laila ua hoʻomaha ka mea a i ʻole e neʻe ana ma ka wikiwiki mau.
Neʻe ka poloka i ka wikiwiki mau, no laila ʻo ka ikaika hopena e hana ana ma ka poloka = 0. No ka ikaika hopena i = 0, me ka ikaika huki F i ka ʻākau, pono e loaʻa kahi ikaika i like ka nui me F akā ua kuhikuhi ʻia i ka hema. ʻO ka ikaika i nīnau ʻia ʻo ia ka ikaika friction kinetic, ka ikaika friction kinetic e hana ana ma ka poloka i ka wā e neʻe ana ka mea. Ma ke ʻano makemakika:
No ka mea, neʻe ka mea ma kahi laina pololei ma ka wikiwiki mau, ʻo ka nui o ka ikaika huki F = f_s = 1 Newton

3. Ke paheʻe nei kahi pahu me ke kaumaha o 1 kg i lalo ma ka wikiwiki mau ma kahi mokulele inclined ʻino. E hoʻoholo i ke coefficient o ka friction kinetic… (g = 10 m/s²)
Pahana

Kapekuʻi:
w = umekaumaha, w_x = ʻāpana o ke koʻikoʻi e kūlike ana me ka ʻili o ka mokulele i hoʻohuli ʻia, w_y = ʻāpana o ka ikaika o ke kaumaha kū pololei i ka mokulele i hoʻohuli ʻia, N = ikaika maʻamau, f_k = ka ikaika kuʻi kinetic.

Pane :
Paheʻe ka pahu i lalo ma ka wikiwiki mau, no laila ʻo ka ikaika hopena = 0. Neʻe ka pahu ma luna o kahi ʻili mokulele inclined, kahi ma ka ʻili mokulele inclined aia kahi ikaika w_x a me f_k. Loaʻa i kēia mau ikaika ʻelua ka nui like akā ʻokoʻa nā kuhikuhi no laila ʻo ka hopena o ka ikaika = 0.

[ʻŌlelo Pelekania: Ka ikaika o ka friction static a me kinetic - nā pilikia a me nā hoʻonā ]

4. Inā he 4 kg ke kaumaha o ka mea, ʻo ke kihi o ka hili ʻana he 30^o a me ka wikiwiki o ka umekaumaha o 10 ms^-2 E paheʻe mau ana ka mea. ʻO ka waiwai nui loa o ke koina o ka friction ma waena o ka mea a me ka mokulele inclined…
Pahana
Ua ʻike ʻia:
m = 4 kg, g = 10 m/s²
Nīnau ʻia: ke koina nui loa o ka friction?
Pane:
ʻOi aku ka nui o ke koina friction static ma mua o ke koina friction kinetic, no laila ʻo ka manaʻo o ke koina friction kiʻekiʻe loa ʻo ia ka koina friction static kiʻekiʻe loa.
ʻAʻole neʻe nā mea i ke kuhikuhi kū pololei:
E pani iā ​​f_s ma ka hoohalike 1 me f_s ma ka hoʻohālikelike 2.
5. Inā kau ʻia kahi mea ma luna o kahi ʻili ʻinoʻino a laila huki ʻia me ka ikaika, e kū mai kahi ikaika kū'ē i kapa ʻia ʻo ka friction. ʻO ka nui o kēia ikaika frictional e pili ana i...
A. ka ʻoʻoleʻa o ka ʻili friction
B. ka nui o ka ikaika maʻamau
C. ka ʻoʻoleʻa o nā ʻili frictional a me ka nui o ka ikaika maʻamau
D. ke kaumaha o ka mea e huki ʻia ana
E. ka nui o ka ikaika e huki ai i ka mea
Pahana
Hana ka friction static ke huki ʻia kahi mea akā ʻaʻole naʻe e neʻe ana. Hana ka friction kinetic ke neʻe nei kahi mea.
Inā aia ka mea ma luna o kahi mokulele pālahalaha a laila N = w = mg
Inā aia ka mea ma luna o kahi mokulele i hoʻohaʻahaʻa ʻia a laila ʻo N = w_y = w cos theta (e nānā i ka pilikia hoʻohālike 1)
Wehewehe: f_s = ka ikaika kuʻi paʻa, f_k = ka ikaika kuʻi kinetic, N = ka ikaika maʻamau, w = umekaumaha = ka nuipa o ka mea, g = ka wikiwiki ma muli o ke umekaumaha.
Inā pili ka pilikia i kahi ʻili pālahalaha ʻinoʻino, a laila pili ka nui o ka ikaika frictional i ka ʻinoʻino o ka ʻili (ka nui o ka friction) a me ka ikaika maʻamau (N).
ʻO C ka pane pololei.

6. ʻO ka nui o ka ikaika frictional ma luna o kahi mea e neʻe ana ma kahi mokulele inclined e pili ana i...
A. ke kaumaha o ka mea a me ka wikiwiki o ka mea
B. ke kihi o ka ʻiʻo o ka mokulele i ka mokulele ākea a me ka wikiwiki o ka mea
C. ka ikaika maʻamau a me ka ʻoʻoleʻa o ka ʻili o ka mea
D. ke kaumaha o ka mea a me ke kihi o ka ʻiʻo o ka mokulele i ka mokulele pae
E. ka ʻoʻoleʻa o ka ʻili o ka mokulele a me ka wikiwiki o ka mea
Pahana
ʻO ke ʻano hana no ka ikaika friction static kiʻekiʻe loa ma kahi mokulele inclined:
ʻO C ka pane pololei.
ʻOiai ke koina o ka friction e hilinaʻi wale ʻia ma ke kihi o ka inclination i ka horizontal (theta).