Imizimba exhunywe ngentambo kanye ne-pulley – ukusetshenziswa kwezinkinga nezixazululo zomthetho kaNewton wokunyakaza

1. Amabhokisi amabili axhunywe ngentambo egijima phezu kwe-pulley. Unganaki isisindo sentambo ne-pulley nanoma yikuphi ukungqubuzana ku-pulley. Isisindo sebhokisi 1 = 2 kg, isisindo sebhokisi 2 = 3 kg, ukusheshisa ngenxa yamandla adonsela phansi = 10 m/s 2 . Thola (a) Ukusheshisa kwesistimu (b) Ukucindezeleka entanjeni!

Imizimba exhunywe ngentambo kanye ne-pulley - ukusetshenziswa kwezinkinga zomthetho kaNewton wokunyakaza kanye nezixazululo 1

Isixazululo

Imizimba exhunywe ngentambo kanye ne-pulley - ukusetshenziswa kwezinkinga zomthetho kaNewton wokunyakaza kanye nezixazululo 2Kwaziwa:

Isisindo sebhokisi 1 (m1 ) = 2 kg

Isisindo sebhokisi 2 (m2 ) = 3 kg

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s 2

Isisindo sebhokisi 1 (w 1 ) = m 1 g = (2)(10) = 20 Newtons

Isisindo sebhokisi 2 (w 2 ) = m 2 g = (3)(10) = 30 AmaNewton

Isixazululo:

(a) ubukhulu kanye nesiqondiso sokusheshisa

w 2 > w 1 ngakho ibhokisi 2 liyashesha liyehla futhi ibhokisi 1 liyashesha liye phezulu.

Amandla anesiqondiso esifanayo nokusheshisa (w 2 kanye no-T 1 ), uphawu lwawo luhle. Amandla anesiqondiso esiphambene nokusheshisa (T 2 kanye no-w 1 ), uphawu lwawo luhle.

∑ F = ma

w2 - T2 + T1 - w1 = (m1 +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

Ubukhulu bokusheshisa buyi - 2 m/s 2.

(b) Amandla okucindezela

Ibhokisi 2:

Kunezenzo ezimbili zamandla ebhokisini 2: okokuqala, isisindo sebhokisi 2 (w 2 ), kukhomba phansi ukuze kube kuhle. Okwesibili, amandla okucindezela asebenza ebhokisini 2 (T 2 ), kukhomba phezulu ukuze kube kubi. Sebenzisa umthetho wesibili wokunyakaza kaNewton .

∑ F = ma

w 2 – T 2 = m 2 a

30 – T 2 = (3)(2)

30 – T 2 = 6

Isigaba 2 = 30 – 6

I-T 2 = 24 Newton

Ibhokisi 1:

Kunezenzo ezimbili zamandla ebhokisini 1. Okokuqala , isisindo sebhokisi 1 (w 1 ), sikhomba phansi ngakho-ke singesihle. Okwesibili , amandla okucindezela asebenza ebhokisini 1 (T 1 ) akhomba phezulu ngakho-ke singesihle. Sebenzisa umthetho wesibili wokunyakaza kaNewton:

∑ F = ma

I-T 1 – w 1 = m 1 a

I-T 1 – 20 = (2)(2)

Isigaba 1 – 20 = 4

I-T 1 = 20 + 4

I-T 1 = 24 Newton

Ubukhulu bamandla okucindezela = T 1 = T 2 = T = 24 Newtons

[irp]

2. Into esendaweni evundlile eqondile. Isisindo sento 1 = 2 kg, isisindo sento 2 = 4 kg, ukusheshisa ngenxa yamandla adonsela phansi = 10 m/s 2 , i-coefficient ye-static friction = 0.4, i-coefficient ye-kinetic friction = 0.3. Uhlelo luphumule noma lusheshisiwe? Uma uhlelo lusheshisiwe, thola ubukhulu kanye nesiqondiso sokusheshisa kwesistimu!

Imizimba exhunywe ngentambo kanye ne-pulley - ukusetshenziswa kwezinkinga zomthetho kaNewton wokunyakaza kanye nezixazululo 3

Isixazululo

Imizimba exhunywe ngentambo kanye ne-pulley - ukusetshenziswa kwezinkinga zomthetho kaNewton wokunyakaza kanye nezixazululo 4Kwaziwa:

Isisindo sento 1 (m 1 ) = 2 kg

Isisindo sento 2 (m 2 ) = 4 kg

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s 2

I-Coefficient yokungqubuzana okungaguquki ( μs ) = 0.4

I-coefficient ye-kinetic friction ( μk ) = 0.3

Isisindo sento 1 (w 1 ) = m 1 g = (2)(10) = 20 AmaNewton

Isisindo sento 2 (w 2 ) = m 2 g = (4)(10) = 40 AmaNewton

Amandla avamile asetshenziswa entweni 1 (N) = w 1 = 20 amaNewton

Amandla okungqubuzana okungaguquki okwenziwa entweni 1 (fs ) = μ s N = (0.4)(20) = 8 Newtons

Amandla okungqubuzana kwe-kinetic asetshenziswa entweni 1 (f k ) = μ k N = (0.3)(20) = 6 amaNewton

Okufunwayo: ukusheshisa (a)

Isixazululo:

w 2 > fs ( 40 Newton > 8 Newton) ngakho into 2 isheshiswa ngokuqondile phansi kanti into 1 isheshiswa ngokuqondile ibheke kwesokudla. Amandla okungqubuzana asebenza ezintweni 1 amandla okungqubuzana kwe-kinetic (f k ). Sebenzisa umthetho wesibili wokunyakaza kaNewton:

∑ F = ma

w 2 – i = (m 1 + m 2 ) a

40 – 6 = (2 + 4) a

34 = 6 a

a = 34 / 6 = 17 / 3

a = 5.7 m/s 2

Ubukhulu bokusheshisa = 5.7 m/s 2

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  1. Isisindo kanye nesisindo
  2. amandla ajwayelekile
  3. Umthetho wesibili wokunyakaza kukaNewton
  4. Amandla okungqubuzana
  5. Ukunyakaza endaweni evundlile ngaphandle kwamandla okungqubuzana
  6. Ukunyakaza kwemizimba emibili ngokusheshisa okufanayo endaweni evundlile eqinile ngamandla okungqubuzana
  7. Ukunyakaza endizeni ethambekele ngaphandle kwamandla okungqubuzana
  8. Ukunyakaza endizeni ethambekele emangelengele ngamandla okungqubuzana
  9. Ukunyakaza e-lifti
  10. Ukunyakaza kwemizimba kuxhunywe ngezintambo nama-pulleys
  11. Imizimba emibili enesilinganiso esifanayo sokusheshisa
  12. Ukuzungeza ijika eliyisicaba - amandla okunyakaza okujikelezayo
  13. Ukuzungeza ijika eligobile - amandla okunyakaza okujikelezayo
  14. Ukunyakaza okufanayo kumbuthano ovundlile
  15. Amandla aphakathi ahambisanayo ajikelezayo

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