1. E jikọtara igbe abụọ site na eriri na-agbafe n'elu pulley. Eleghara oke nke eriri na pulley na esemokwu ọ bụla dị na pulley anya. Ibu nke igbe 1 = 2 kg, ibu nke igbe 2 = 3 kg, osooso n'ihi ike ndọda = 10 m/s 2. Chọta (a) Osooso nke sistemụ (b) Osooso dị na eriri ahụ!
ngwọta
A maara:
Ibu nke igbe ahụ 1 (m1 ) = 2 kg
Ibu nke igbe ahụ 2 (m2 ) = 3 kg
Ọsọ ọsọ nke ike ndọda (g) = 10 m/s 2
Ibu nke igbe 1 (w 1 ) = m 1 g = (2)(10) = 20 Newtons
Ibu nke igbe 2 (w 2 ) = m 2 g = (3)(10) = 30 Newtons
Ngwọta:
(a) nha na ntụziaka nke osooso ahụ
w 2 > w 1 ya mere igbe nke abụọ ji ọsọ gbadaa, igbe nke mbụ na-agbakwa ọsọ elu.
Ike ndị nwere otu ụzọ na ọsọ (w 2 na T 1 ), akara ha dị mma. Ike ndị nwere ụzọ dị iche na ọsọ (T 2 na w 1 ), akara ha adịghị mma.
∑ F = ma
w2 - A2 +T1 - w1 = (m)1 +m2) a ——-> T1 =T2 =T
w 2 – T + T – w 1 = (m 1 + m 2 ) a
w 2 – w 1 = (m 1 + m 2 ) a
30 – 20 = (2 + 3) a
10 = 5 a
a = 10/5
a = 2 m/s 2
Oke ọsọ nke ọsọ ahụ bụ 2 m/s 2.
(b) Ike nrụgide ahụ
Igbe nke 2:
E nwere ike abụọ na-arụ ọrụ na igbe nke abụọ: nke mbụ, ibu nke igbe nke abụọ (w 2 ), na-atụ aka ala ka ọ dị mma. Nke abụọ, ike nrụgide dị na igbe nke abụọ (T 2 ), na-atụ aka elu ka ọ bụrụ ihe na-adịghị mma. Tinye iwu nke abụọ nke mmegharị nke Newton.
∑ F = ma
w 2 – T 2 = m 2 a
30 – T 2 = (3)(2)
30 – T 2 = 6
T 2 = 30 – 6
T 2 = 24 Newtons
Igbe nke 1:
E nwere ike abụọ na-arụ ọrụ na igbe 1. Nke mbụ , ibu nke igbe 1 (w 1 ), na-atụ aka ala ka ọ bụrụ ihe na-adịghị mma. Nke abụọ , ike nrụgide dị na igbe 1 (T 1 ) na-atụ aka elu ka ọ bụrụ ihe dị mma. Tinye iwu nke abụọ nke mmegharị nke Newton:
∑ F = ma
T 1 – w 1 = m 1 a
T 1 – 20 = (2)(2)
T 1 – 20 = 4
T 1 = 20 + 4
T 1 = 24 Newtons
Oke ike nrụgide = T 1 = T 2 = T = Newton 24
[irp]
2. Ihe dị n'elu elu kwụ ọtọ. Ibu ihe 1 = 2 kg, ibu ihe 2 = 4 kg, osooso n'ihi ike ndọda = 10 m/s 2 , coefficient nke esemokwu static = 0.4, coefficient nke esemokwu kinetic = 0.3. Sistemụ ahụ na-ezu ike ma ọ bụ na-eme ngwa ngwa? Ọ bụrụ na sistemụ ahụ na-eme ngwa ngwa, chọta oke na ntụziaka nke osooso sistemụ ahụ!
ngwọta
A maara:
Ibu nke ihe 1 (m1 ) = 2 kg
Ibu nke ihe 2 (m2 ) = 4 kg
Ọsọ ọsọ nke ike ndọda (g) = 10 m/s 2
Ọnụọgụ nke esemokwu na-anaghị agbanwe agbanwe ( μs ) = 0.4
Ọnụọgụ nke esemokwu kinetic ( μk ) = 0.3
Ibu nke ihe 1 (w 1 ) = m 1 g = (2)(10) = 20 Newtons
Ibu nke ihe 2 (w 2 ) = m 2 g = (4)(10) = 40 Newtons
Ike nkịtị a na-etinye n'ihe 1 (N) = w 1 = Newtons 20
Ike nke esemokwu kwụ ọtọ e tinyere n'ihe 1 (f s ) = μ s N = (0.4)(20) = 8 Newtons
Ike nke esemokwu kinetic e tinyere na ihe 1 (f k ) = μ k N = (0.3)(20) = 6 Newtons
A chọrọ: osooso (a)
Ngwọta:
w 2 > f s (40 Newton > 8 Newton) ya mere ihe 2 na-agba ọsọ n'ala kwụ ọtọ ma mee ka ihe 1 na-agba ọsọ n'akụkụ aka nri. Ike esemokwu nke na-arụ ọrụ na ihe 1 bụ ike nke esemokwu kinetic (f k ). Tinye iwu nke abụọ nke mmegharị Newton:
∑ F = ma
w 2 – = (m 1 + m 2 ) a
40 – 6 = (2 + 4) a
34 = 6 a
a = 34 / 6 = 17 / 3
a = 5.7 m/s 2
Oke nke osooso = 5.7 m/s 2
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- Uka na ibu
- Ike nkịtị
- Iwu ngagharị nke abụọ nke Newton
- Ike esemokwu
- Mmegharị n'elu kwụ ọtọ na-enweghị ike esemokwu
- Mmegharị nke ahụ abụọ nwere otu osooso ahụ n'elu elu kwụ ọtọ siri ike yana ike esemokwu
- Mmegharị n'elu ụgbọelu ahụ gbagọrọ agbagọ na-enweghị ike esemokwu
- Mmegharị n'elu ụgbọelu siri ike nke nwere ike esemokwu
- Mmegharị n'ime igwe mbuli elu
- A na-ejikọta mmegharị nke ahụ site na eriri na pulleys
- Ahụ abụọ nwere otu oke ọsọ ọsọ
- Ịgbagharị agba dị larịị - ike mmegharị okirikiri
- Ịgbagharị agba gburugburu - mgbanwe nke mmegharị okirikiri
- Mmegharị otu otu n'ime okirikiri kwụ ọtọ
- Ike etiti n'ime mmegharị okirikiri otu otu
