Nā pilikia i hoʻoponopono ʻia ma nā kānāwai neʻe o Newton - ke kānāwai neʻe ʻelua o Newton
1. Ua hoʻolalelale ʻia kahi mea 1 kg ma kahi mau 5 m/s 2. E kuhi i ka ikaika upena e pono ai e hoʻolalelale i ka mea.
ʻIke ʻia:
Nuipaʻa (m) = 1 kg
Hoʻolalelale (a) = 5 m/s 2
Makemake ʻia : ka ikaika upena (∑F)
Lōlā:
Hoʻohana mākou i ke kānāwai ʻelua o Newton e loaʻa ai ka ikaika upena.
∑ F = ma
∑ F = (1 kg)(5 m/s 2 ) = 5 kg m/s 2 = 5 Newtons
ʻAʻole maopopo
2. Ka nuipa o kahi mea = 1 kg, ka ikaika ʻupena ∑F = 2 Newtons. E hoʻoholo i ka nui a me ke kuhikuhi o ka wikiwiki o ka mea….
ʻIke ʻia:
Nuipaʻa (m) = 1 kg
Ka ikaika ʻupena (∑F) = 2 Newton
Makemake ʻia : Ka nui a me ke kuhikuhi o ka wikiwiki (a)
Lōlā:
a = ∑F / m
a = 2 / 1
a = 2 m/s 2
ʻO ke kuhikuhi o ka hoʻolalelale = ke kuhikuhi o ka ikaika upena (∑F)
ʻAʻole maopopo
3. Ka nuipa o ka mea = 2 kg, F 1 = 5 Newtons, F 2 = 3 Newton. ʻO ka nui a me ke kuhikuhi o ka wikiwiki…
ʻIke ʻia:
Nuipaʻa (m) = 2 kg
F1 = 5 Newtons
F2 = 3 Newtons
Makemake ʻia: Ka nui a me ke kuhikuhi o ka wikiwiki (a)
Lōlā:
ka ikaika ʻupena:
∑ F = F 1 – F 2 = 5 – 3 = 2 Newtons
Ka nui o ka hoʻolalelale ʻana:
a = ∑F / m
a = 2 / 2
a = 1 m/s 2
Ke kuhikuhi o ka hoʻolalelale = ke kuhikuhi o ka ikaika ʻupena = ke kuhikuhi o F 1
ʻAʻole maopopo
4. Ka nuipa o ka mea = 2 kg, F 1 = 10 Newtons, F 2 = 1 Newton. ʻO ka nui a me ke kuhikuhi o ka wikiwiki…
ʻIke ʻia:
Nuipaʻa (m) = 2 kg
F2 = 1 Newtons
F1 = 10 Newtons
F 1x = F 1 cos 60 o = (10)(0.5) = 5 Newtons
Makemake ʻia : Ka nui a me ke kuhikuhi o ka wikiwiki (a)
Lōlā:
Ka ikaika ʻupena:
∑ F = F 1x – F 2 = 5 – 1 = 4 Newtons
Ka nui o ka hoʻolalelale ʻana:
a = ∑F / m
a = 4 / 2
a = 2 m/s 2
Ke kuhikuhi o ka hoʻolalelale = ke kuhikuhi o ka ikaika ʻupena = ke kuhikuhi o F 1x
ʻAʻole maopopo
5. F 1 = 10 Newtons, F 2 = 1 Newton, m 1 = 1 kg, m 2 = 2 kg. ʻO ka nui a me ke kuhikuhi o ka hoʻolalelale ʻana…
ʻIke ʻia:
Nuipaʻa 1 (m1 ) = 1 kg
Nuipaʻa 2 (m2 ) = 2 kg
F1 = 10 Newtons
F2 = 1 Newtons
Makemake ʻia : Ka nui a me ke kuhikuhi o ka wikiwiki (a)
Lōlā:
ʻO ka ikaika upena:
∑ F = F 1 – F 2 = 10 – 1 = 9 Newtons
Ka nui o ka hoʻolalelale ʻana:
a = ∑F / ( m1 + m2 )
a = 9 / (1 + 2)
a = 9 / 3
a = 3 m/s 2
ʻO ke kuhikuhi o ka hoʻolalelale = ke kuhikuhi o ka ikaika upena = ke kuhikuhi o F 1
ʻAʻole maopopo
6.
Ua hoʻolalelale ʻia kahi poloka 40-kg e ka ikaika o 200 N. ʻO ka hoʻolalelale ʻana o ka poloka he 3 m/ s² . E hoʻoholo i ka nui o ka ikaika friction i ʻike ʻia e ka poloka.
A. 15 N
B. 40 N
C. 43 N
D. 80 N
ʻIke ʻia:
Nuipaʻa (m) = 40 kg
Ikaika (F) = 200 N
Hoʻolalelale (a) = 3 m/s 2
Makemake ʻia: Ka ikaika kuʻi (F g )
Lōlā:
ʻO ke kaulike o ke kānāwai lua o ka neʻe ʻana o Newton
∑ F = ma
∑ F = ikaika upena, m = nuipa, a = wikiwiki
ʻO ke kuhikuhi o ka ikaika F i ka ʻākau, ʻo ke kuhikuhi o ka ikaika kuʻi i ka hema (ʻo ke kuhikuhi o ka ikaika kuʻi e kūʻē i ke kuhikuhi o ka neʻe ʻana o ka mea).
E koho i ka ʻākau e like me ka maikaʻi a me ka hema e like me ka maikaʻi ʻole.
∑ F = ma
F – F g = ma
200 – F g = (40)(3)
200 – F g = 120
F g = 200 – 120
F g = 80 Newton
ʻO D ka pane pololei.
7. E kau i ka poloka A me ke kaumaha o 100-grams ma luna o ka poloka B me ke kaumaha o 300 grams, a laila ua paʻi ʻia ka poloka B me ka ikaika o 5 N i luna. E hoʻoholo i ka ikaika maʻamau i hoʻokau ʻia e ka poloka B ma ka poloka A.
A. 1 N
B. 1.25 N
C. 2 N
D. 3 N
ʻIke ʻia:
Ikaika (F) = 5 Newton
Ka nuipa o ka poloka A (m A ) = 100 grams = 0.1 kg
Ka nuipa o ka poloka B (m B ) = 300 grams = 0.3 kg
Ka wikiwiki o ke koʻikoʻi (g) = 10 m/s 2
Kaumaha o ka poloka A (w A ) = (0.1 kg)(10 m/s 2 ) = 1 kg m/s 2 = 1 Newton
Kaumaha o ka poloka B (w B ) = (0.3 kg)(10 m/s 2 ) = 3 kg m/s 2 = 3 Newtons
Makemake ʻia: Ka ikaika maʻamau i hoʻokau ʻia e ka poloka B i ka poloka A
Lōlā:
Aia kekahi mau mana e hana ana ma nā poloka ʻelua, e like me ka mea i hōʻike ʻia ma ke kiʻi.
F = ka ikaika paʻi (hana ma ka poloka B)
w A = ke kaumaha o ka poloka A (hana ma ka poloka A)
w B = ke kaumaha o ka poloka B (hana ma ka poloka B)
N A = ka ikaika maʻamau i hoʻokau ʻia e ka poloka B ma ka poloka A (Hana ma ka poloka A)
N A ' = ka ikaika maʻamau i hoʻokau ʻia e ka poloka A ma ka poloka B (Hana ma ka poloka B)
E hoʻopili i ke kānāwai ʻelua o ka neʻe ʻana o Newton ma nā poloka ʻelua:
∑ F = ma
F – w A – w B + N A – N A ' = (m A + m B ) a
ʻO N A a me N A ' nā ikaika hana-pane i loaʻa ka nui like akā ʻokoʻa ke kuhikuhi no laila ua hoʻopau ʻia mai ka hoohalike.
F – w A – w B = (m A + m B ) a
5 – 1 – 3 = (0.1 + 0.3) a
5 – 4 = (0.4) a
1 = (0.4) a
a = 1 / 0.4
a = 2.5 m/s 2
E hoʻopili i ke kānāwai ʻelua o ka neʻe ʻana o Newton ma ka poloka A:
∑ F = ma
N A – w A = m A a
N A – 1 = (0.1)(2.5)
ʻAʻole maopopo - 1 = 0.25
ʻAʻole maopopo = 1 + 0.25
NA = 1.25 Newtons
ʻO ka pane pololei ʻo B.
8. He mea me ke kaumaha o 4 N i kākoʻo ʻia e ke kaula a me ka pulley. Hana ka ikaika o 2 N ma ka poloka a huki ʻia kekahi wēlau o ke kaula e ka ikaika o 9 N. E hoʻoholo i ka ikaika upena e hana ana ma ka mea X.
A. 3 N i luna
B. 4 N i lalo
C. 9 N i luna
D. 9 N i lalo
ʻIke ʻia:
Kaumaha o X (w X ) = 4 Newton
Ka ikaika huki (F x ) = 2 Newton
Ka ikaika hoʻohaʻahaʻa (F T ) = 9 Newtons
Makemake ʻia: Hana ka ikaika ʻupena ma luna o ka mea
Lōlā:
Nā mana i luna kū pololei e hana ana ma luna o ka mea
Ua like ka nui o ka ikaika hoʻopaʻa ma nā ʻāpana a pau o ke kaula. No laila, ʻo ka ikaika hoʻopaʻa he 9 N.
Nā mana i lalo i luna e hana ana ma luna o ka mea
ʻElua mau mana e hana ana ma ka mea X a ua kau pololei nā mana ʻelua i lalo, ʻo ka ʻāpana moe o ke kaumaha w x a me ka ʻāpana moe o ka mana F x.
Hana ka ikaika upena ma luna o ka mea
F T – w X – F x = 9 – 4 – 2 = 9 – 6 = 3
ʻO ka ikaika upena e hana ana ma ka mea X he 3 Newtons, i luna pololei.
ʻO ka pane pololei ʻo A.
9. He mea i hoʻomaha mua ma luna o kahi ʻili pālahalaha laumania. Hana ka ikaika o 16 N ma luna o ka mea no laila e wikiwiki ka mea ma 2 m/s 2. Inā ʻo ka mea like i hoʻomaha ma luna o kahi ʻili pālahalaha ʻino no laila e hana ka ikaika friction ma luna o ka mea he 2 N, a laila e hoʻoholo i ka wikiwiki o ka mea inā hana ka ikaika like o 16 N ma luna o ka mea.
A. 1.75 m/s 2
B. 1.50 m/s 2
C. 1.00 m/s 2
D. 0.88 m/s 2
ʻIke ʻia:
Ikaika (F) = 16 Newtons = 16 kg m/s 2
Hoʻolalelale (a) = 2 m/s 2
Ka ikaika kuʻi (F fric ) = 2 Newtons = 2 kg m/ s2
Makemake ʻia: Ka wikiwiki o ka mea?
Lōlā:
ʻIli pālahalaha laumania (ʻaʻohe ikaika kuʻi):
ΣF = ma
F = ma
16 = (m) 2
m = 16 / 2
m = 8 kg
He 8 kilokani ke kaumaha o ka mea.
ʻIli pālahalaha ʻāwiliwili (aia ka ikaika friction):
ΣF = ma
F – F fric = ma
16 – 2 = 8 a
14 = 8 a
a = 14 / 8
a = 1.75 m/s 2
ʻO ka wikiwiki o ka mea he 1.75 m/ s².
ʻO ka pane pololei ʻo A.
10. Pahu ʻo Tom lāua ʻo Andrew i kahi mea ma ka papahele laumania. Pahu ʻo Tom i ka mea me ka ikaika o 5.70 N. Inā he 2.00 kg ke kaumaha o ka mea a he 2.00 ms -2 ka wikiwiki i ʻike ʻia e ka mea , a laila e hoʻoholo i ka nui a me ke kuhikuhi o ka ikaika e hana ai ʻo Tom.
A. 1.70 N a ʻo kona kuhikuhi ke kūʻē i ka ikaika i hana ʻia e Andre.w
B. 1.70 N a ua like kona kuhikuhi me ka ikaika i hana ʻia e Andrew
C. 2.30 N a ʻo kona kuhikuhi ke kūʻē i ka ikaika i hana ʻia e Andrew.
D. 2.30 N a ua like kona kuhikuhi me ka ikaika i hana ʻia e Andrew.
ʻIke ʻia:
Ka ikaika paʻi i hana ʻia e Andrew (F 1 ) = 5.70 Newton
Ka nuipa o ka mea (m) = 2.00 kg
Hoʻolalelale (a) = 2.00 m/s 2
Makemake ʻia: Ka nui a me ke kuhikuhi o ka ikaika i hana ʻia e Tom (F 2 )?
Lōlā:
E hoʻopili i ke kānāwai ʻelua o ka neʻe ʻana o Newton:
∑ F = ma
F 1 + F 2 = ma
5.70 + F 2 = (2)(2)
5.70 + F 2 = 4
F 2 = 4 – 5.70
F 2 = – 1.7 Newton
Ua hōʻike ka hōʻailona Minus ua kū'ē ʻo (F 2 ) i ka hana ikaika paʻi a Andrew (F 1 ).
ʻO ka pane pololei ʻo A.
11. Inā like ke kaumaha o ka poloka, ʻo wai ke kiʻi e hōʻike ana i ka wikiwiki liʻiliʻi loa?
pāʻoihana
Ka ikaika ʻupena A:
ΣF = 4 N + 2 N – 3 N = 6 N – 3 N = 3 Newtons, hema
Ka ikaika ʻupena B:
ΣF = 2 N + 3 N – 4 N = 5 N – 4 N = 1 Newtons, ma ka ʻākau.
Ka ikaika ʻupena C:
ΣF = 4 N + 3 N – 2 N = 7 N – 2 N = 5 Newtons, ma ka ʻākau.
Ka ikaika ʻupena D:
ΣF = 3 N + 4 N + 2 N = 9 Newtons, ma ka ʻākau
ʻO ke kaulike o ke kānāwai ʻelua o Newton:
ΣF = ma
a = ΣF / m
a = wikiwiki, ΣF = ikaika upena, m = nuipa
Ma muli o ke ʻano hana i luna, ua kūlike pololei ka wikiwiki (a) me ka ikaika ʻupena (ΣF) a ua kūlike ʻole me ka nuipaʻa (m). Inā like ka nuipaʻa o kahi mea, ʻo ka nui o ka ikaika hopena, ʻo ka nui o ka wikiwiki a i ʻole ka liʻiliʻi o ka ikaika hopena, ʻo ka liʻiliʻi o ka wikiwiki.
Ma muli o ka helu ʻana ma luna, ʻo ka ikaika liʻiliʻi loa he 1 Newton no laila ʻo ka wikiwiki hoʻi ka mea liʻiliʻi loa.
ʻO ka pane pololei ʻo B.
ʻAʻole maopopo
12. Hana kekahi mau ikaika ma luna o kahi mea me ke kaumaha o 20 kg, e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei.
E hoʻoholo i ka wikiwiki o ka mea.
ʻIke ʻia:
Ka nuipa o ka mea (m) = 20 kg
Ka ikaika ʻupena (ΣF) = 25 N + 30 N – 15 N = 40 N
Makemake ʻia: Ka wikiwiki o kahi mea
Lōlā:
ʻO ka wikiwiki o ka mea i helu ʻia me ka hoʻohana ʻana i ka hoohalike o ke kānāwai ʻelua o Newton:
ΣF = ma
a = ΣF / m = 40 N / 20 kg = 2 N/kg = 2 m/s 2
ʻAʻole maopopo
13. ʻO wai ka ʻōlelo ma lalo nei e wehewehe ana i ke kānāwai ʻekolu o Newton?
(1) Ua paʻi aku nā ohua i mua i ka wā i pale koke ai ke kaʻa
(2) ʻAʻole e hāʻule nā puke ma ka pepa ke huki koke ʻia ka pepa
(3) I ka wā e pāʻani ana i ka papa heʻe nalu ke hoʻokuke ka wāwae i ka honua i hope a laila e paheʻe ka papa heʻe nalu i mua
(4) Ua paʻi hope ʻia nā waʻa, neʻe i mua
Lōlā:
(2) Ke kānāwai mua o Newton
(3) Ke kānāwai ʻekolu o Newton
(4) Ke kānāwai ʻekolu o Newton
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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
- Ka neʻe ʻana ma luna o ka ʻili ākea me ka ʻole o ka ikaika friction
- ʻO ka neʻe ʻana o nā kino ʻelua me ka wikiwiki like ma luna o ka ʻili pālahalaha ʻinoʻino me ka ikaika friction
- Ka neʻe ʻana ma luna o ka mokulele i hoʻohuli ʻia me ka ʻole o ka ikaika friction
- Ka neʻe ʻana ma luna o ka mokulele i hoʻohaʻahaʻa ʻia me ka ikaika friction
- Neʻe ʻana i loko o kahi elevator
- Hoʻopili ʻia ka neʻe ʻana o nā kino e nā kaula a me nā pulleys
- ʻElua mau kino me ka nui like o ka wikiwiki
- Ke hoʻopuni ʻana i kahi piʻo pālahalaha - nā dinamika o ka neʻe pōʻai
- Ke hoʻopuni ʻana i kahi piʻo panakō - nā dinamika o ka neʻe pōʻai
- Neʻe like ʻana ma kahi pōʻai ʻākea
- Ka ikaika centripetal i ka neʻe pōʻai like
