Nā pilikia i hoʻoponopono ʻia ma nā kānāwai neʻe o Newton - Ka ikaika o ka friction static a me ka kinetic
1. Kau kekahi mea ma luna o kahi papahele pālahalaha. ʻO ke koina o ka friction static he 0.4 a ʻo ka wikiwiki o ke koʻikoʻi he 9.8 m/s 2. E hoʻoholo (a) Ka ikaika nui loa o ka friction static (b) Ka ikaika liʻiliʻi loa o F
pāʻoihana
ʻIke ʻia:
Nuipaʻa (m) = 1 kg
ʻO ke koina o ka haʻalulu paʻa (μs ) = 0.4
ʻO ka wikiwiki o ke koʻikoʻi (g) = 9.8 m/s 2
Kaumaha (w) = mg = (1 kg)(10 m/s 2 ) = 10 kg m/s 2 = 10 Newtons
Ka ikaika maʻamau (N) = w = 10 Newtons
Makemake ʻia:
(a) Ka ikaika nui loa o ka haʻalulu paʻa (b) Ka ikaika liʻiliʻi loa o F
Lōlā:
(a) ʻO ka ikaika nui loa o ka haʻalulu paʻa
fs = μsN
fs = (0.4)(9.8 N) = 3.92 Newtons
(b) ʻO ka ikaika liʻiliʻi loa o F
Inā hoʻokau ʻia ka ikaika F ma luna o ka mea akā ʻaʻole i neʻe ʻia ka mea, no laila pono ka ikaika o ka haʻalulu paʻa i hoʻokau ʻia e ka papahele ma luna o ka mea. Inā hoʻomaka ka mea e neʻe, ua ʻoi aku ka ikaika o ka haʻalulu paʻa, pono ka ikaika o ka haʻalulu kinetic. Hoʻomaka ka mea e neʻe inā ʻoi aku ka nui o F ma mua o ka ikaika nui o ka haʻalulu paʻa.
No laila, ʻo ka ikaika liʻiliʻi loa o F = ka ikaika nui loa o ka friction static = 3.92 Newtons.
ʻAʻole maopopo
2. Ua huki ʻia ka pahu 1 kg ma kahi ʻili pālahalaha e ka ikaika F, no laila ke neʻe nei ka pahu ma kahi wikiwiki mau. Inā he 0.1 ka coefficient friction kinetic, e hoʻoholo i ka nui o ka ikaika F! (g = 9.8 m/s 2 )
ʻIke ʻia:
ʻO ke koina friction kinetic ( μk ) = 0.1
Ka nuipa o ka pahu (m) = 1 kg
Ka wikiwiki o ke koʻikoʻi (g) = 9.8 m/s 2
Kaumaha (w) = mg = (1 kg)(9.8 m/s² ) = 9.8 kg m/s² = 9.8 Newtons
Ka ikaika maʻamau (N) = w = 9.8 Newtons
Makemake ʻia : F
Lōlā:
ʻŌlelo ke kānāwai mua o Newton inā ʻaʻohe ikaika upena e hana ma kahi mea, e hoʻomau kēlā me kēia mea i kona kūlana hoʻomaha, a i ʻole ka wikiwiki mau i kahi laina pololei.
No laila, inā neʻe ka mea ma ka wikiwiki mau , ʻaʻohe pono o ka ikaika upena ( Σ F = 0) . Hoʻokau ʻia ka ikaika F ma luna o ka mea ma ke kuhikuhi ʻākau i hiki ai ke hoʻokau ʻia ka ikaika o ka friction kinetic ma luna o ka mea ma ke kuhikuhi hema.
∑ F = 0
F – f k = 0
F = fk
Ka ikaika o ka friction kinetic:
f k = μ k N = (0.1)(9.8 N) = 0.98 Newtons
Neʻe ka mea me ka wikiwiki mau, F = f k = 0.98 Newtons
ʻAʻole maopopo
3. Heʻe kekahi mea i lalo i kahi mokulele i hoʻohaʻahaʻa ʻia me ka wikiwiki mau. E hoʻoholo i ke koina friction kinetic ( μk ) . g = 9.8 m/s 2
pāʻoihana
w = ke kaumaha, w x = ka ʻāpana kaulike o ke kaumaha, nā kiko ma ke kualono, w y = ka ʻāpana kū pololei o ke kaumaha, kū pololei i ka mokulele kualono, N = ka ikaika maʻamau, f k = ka ikaika o ka haʻalulu kinetic.
ʻIke ʻia:
Nuipaʻa (m) = 1 kg
Ka wikiwiki o ke koʻikoʻi (g) = 9.8 m/s 2
kaumaha (w) = mg = (1 kg)(9.8 m/s² ) = 9.8 kg m/s² = 9.8 Newtons
w x = w sin 30 o = (9.8 N)(0.5) = 4.9 Newtons
w y = w cos 30 o = (9.8 N)(0.5) √ 3 = 4.9 √ 3 Newtons
Ka ikaika maʻamau (N) = w y = 4.9 √ 3 Newtons
Makemake ʻia : ke koina friction kinetic ( μk )
Lōlā:
Paheʻe ka mea i lalo ma kahi mokulele hilig me ka wikiwiki mau i hiki ai ka ikaika upena = 0.
∑ F = 0
wx – fk = 0
wx = fk
w x = μ k N
5 = μ k ( 5 √ 3 )
μ k = 5 / 5 √ 3
μ k = 1 / √ 3
μk = 0.58
ʻAʻole maopopo
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- Ka nuipa a me ke kaumaha
- Ka ikaika maʻamau
- Ke kānāwai ʻelua o ka neʻe ʻana o Newton
- ʻO ka ikaika pili
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- Neʻe ma luna o ka mokulele i hoʻohaʻahaʻa ʻia me ka ʻole o ka ikaika friction
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