Igwe dị mfe isii (Lever ụgbọelu gbagọrọ agbagọ) - Nsogbu na Ngwọta
1.
Kedu ụgbọelu nwere otu uru igwe ahụ nwere?
A. (1) na (2)
B. (1) na (3)
C. (2) na (3)
D. (2) na (4)
ngwọta
Igwe dị larịị bụ otu n'ime igwe dị mfe. Igwe dị mfe bụ ngwaọrụ na-enyere ndị mmadụ aka ịrụ ọrụ. A na-eji ụgbọelu dị larịị eme ka ọ dịrị ụmụ mmadụ mfe ibuli ihe ruo n'ogo ụfọdụ.
Uru igwe nke oghere gbagọrọ agbagọ bụ ntụnyere ogologo mgbagọ na elu mgbagọ.
Uru nke usoro ihe dị n'ime oghere ahụ nke a na-akpọ 1 = 50 cm / 30 cm = 5/3
Uru nke usoro ihe eji eme ihe nke oghere a na-akpọ 2 = 5 cm / 4 cm = 5/4
Uru nke usoro ihe eji eme ihe nke elu ahụ dị elu 3 = 50 cm / 40 cm = 5/4
Uru nke oghere a na-atụgharị atụgharị 4 = 5 cm / 3 cm = 5/3
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2.
Anya AB = BC = CD = DE, chọpụta ike ntinye nke a ga-enye na ebe E iji nweta ihe nkwụnye kwesịrị ekwesị.
A maara:
AB = BC = CD = DE = l
Anya dị n'etiti ike mmepụta na fulcrum ( a ) = l
Anya dị n'etiti ike ntinye na fulcrum ( b ) = 3l
Ike mmepụta (w) = 900 Newton
Achọtara: Ike (F)
Ngwọta:
Uru mekaniki:
MA = b / a = 3l/l = 3
Oke ike:
MA = w / F
F = w / MA
F = 900 Newtons / 3
F = 300 Newton
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3.
M na-enye iwu ka e nwee nhazi nke lever ahụ wee chọpụta oke ike ntinye ya.
ngwọta
Chọpụta anya dị n'etiti ike ntinye na fulcrum ( b )
A maara:
Anya dị n'etiti ike mmepụta na fulcrum ( a ) = 25 cm
Ike mmepụta (w) = 480 Newton
Ike ntinye (F) = 160 N
Achọtara: Anya dị n'etiti ike ntinye na fulcrum (b)
Ngwọta:
Uru mekaniki:
MA = w / F = 480 N / 160 N = 3
Anya dị n'etiti ike ntinye na fulcrum (b)
MA = b / a
3 = b / 25 cm
b = (3)(25 cm)
b = 75 cm
Chọpụta oke ike (F)
A maara:
Anya dị n'etiti ike mmepụta na fulcrum ( a ) = 25 cm – 10 cm = 15 cm
Ibu ihe (w) = Newtons 480
Anya dị n'etiti ike ntinye na fulcrum ( b ) = 75 cm
Achọtara: Ike ntinye (F)
Ngwọta:
Uru igwe:
MA = b / a
MA = 75 cm / 15 cm
MA = 5
Oke ike (F):
MA = w / F
F = w / MA
F = 480 Newtons / 5
F = 96 Newton
N'iwu ka ihe eji ejide ihe ahụ nọrọ n'ọnọdụ kwesịrị ekwesị, a ga-ebelata ike ntinye 64 Newton (160 N – 96 N).
4. Oke nke ogologo nke a na b dị na eserese dị n'okpuru bụ a: b = 1: 2.2. Uru kacha nta nke ike F iji bulie ihe B nke nwere ibu nke 330 Newtons bụ…. Newton
A. 100
B. 150
C. 2200
D. 7260
A maara:
Anya dị n'etiti ike mmepụta na fulcrum ( a ) = 1
Anya dị n'etiti ike ntinye na fulcrum (b) = 2.2
Ibu (w) = 330 Newton
Achọtara: Ike ntinye (F)
Ngwọta:
Uru mekaniki nke lever:
MA = w / F = b / a
MA = uru mekanik , w = ibu, F = ike ntinye, b = anya dị n'etiti ike ntinye na fulcrum, a = anya dị n'etiti ike mmepụta na fulcrum
w / F = b / a
330 / F = 2.2 / 1
330 / F = 2.2
330 / 2.2 = F
F = 150 Newton
Azịza ya ziri ezi bụ B.
5. Nwa akwụkwọ na-akwali ihe nwere ike nke F site na isi A ruo isi B, dịka egosiri na eserese dị n'okpuru. Ọ bụrụ na eleghara esemokwu dị n'etiti ihe na ezi anya, chọpụta uru nke igwe.
A. 4
B. 5/3
C. 5/4
D. ¾
A maara:
Ogologo nke elu gbagọrọ agbagọ (y) = mita 4 – mita 1 = mita 3
Ogologo nke elu kwụ ọtọ (x) = mita 4
Achọrọ: Uru mekaniki (MA)
Ngwọta:
Gbakọọ ogologo nke oghere a na-atụgharị site na iji usoro Pythagoras :
R = √3 2 +4 2 = √9 + 16 = √25 = mita 5
Uru mekaniki nke ụgbọelu a na-akpọ "constituted plane":
KM = R / y
KM = mita 5 / mita 3
KM = 5/3
Azịza ya ziri ezi bụ B.
6. Enwere ike ịbawanye uru mekaniki nke lever site na…
A. Mee ka ụzọ nke ọchịchọ dị mkpụmkpụ
B. mee ka akụkụ nke mgbagọ ahụ dịkwuo elu
C. belata akụkụ nke mgbagọ ahụ
D. na-ebelata ike e ji ebugharị ihe
Ngwọta:
Usoro nke uru mekaniki nke mbara elu a na-akpọ "confounded plane":
Uru igwe = ogologo nke elu gbagọrọ agbagọ/ịdị elu nke elu gbagọrọ agbagọ
– Uru igwe ahụ dabere kpọmkwem na ogologo nke elu ahụ gbagọrọ agbagọ, ya mere uru igwe ahụ na-abawanye ma ọ bụrụ na ogologo nke elu ahụ gbagọrọ agbagọ amụba.
– Uru igwe ahụ dị n'ọkwa dị iche na nke elu nke elu ahụ, ya mere, uru igwe ahụ na-ebelata ma ọ bụrụ na elu nke elu ahụ na-abawanye ma na-amụbakwa uru igwe ahụ ma ọ bụrụ na elu nke elu ahụ na-ebelata.
- Ọ bụrụ na e belata akụkụ ahụ, mgbe ahụ, elu nke oghere ahụ na-agbanwe agbanwe ga-ebelata. Uru mekaniki na-abawanye ma ọ bụrụ na ebelata elu nke oghere ahụ na-agbanwe agbanwe. Ya mere, ọ bụrụ na ebelata akụkụ ahụ, uru mekaniki na-abawanye.
Ọ bụrụ na akụkụ ahụ amụbaa, mgbe ahụ, elu nke oghere ahụ amụbaa. Uru ya na-ebelata ma ọ bụrụ na elu nke oghere ahụ amụbaa. Ya mere, ọ bụrụ na akụkụ ahụ amụbaa, uru ya na-ebelata.
Azịza ya ziri ezi bụ C.
