Ukunyakaza endizeni ethambekele kancane ngamandla okungqubuzana – ukusetshenziswa kwezinkinga zomthetho kaNewton wezinyathelo kanye nezixazululo

1. Izinto Mass = 2 kg, ukusheshisa ngenxa yamandla adonsela phansi = 9.8m/s², i-coefficient ye ukungqubuzana okungaguquki = 0.2, i-coefficient of kinetic friction = 0.1. Ingabe into iphumule noma iyasheshisa? Uma into isheshisiwe, thola (a) amandla aphelele (b) ubukhulu kanye nesiqondiso sebhokisi ukusheshisa!

Isixazululo

Kwaziwa:

Isisindo (m) = 2 kg

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 9.8 m/s²

Isilinganiso sokungqubuzana okungaguquki (μ_s) = 0.2

I-coefficient yokungqubuzana kwe-kinetic (μ_k) = 0.1

Isisindo (w) = mg = (2)(9.8) = 19.6 Newton

Ingxenye evundlile ye isisindo (w_x) = isono 30^o = (19.6)(0.5) = 9.8 Newton

Ingxenye eqondile yesisindo se-th (w_y) = w cos 30^o = (19.6)(0.5√3) = 9.8√3 AmaNewton

Amandla avamile (N) = w_y = 9.8√3 uNewton

Amandla okungqubuzana okungaguquki (f)_s) = (0.2)(9.8√3) = 1.96√3 AmaNewton = 3.39 AmaNewton

Amandla okungqubuzana kwe-kinetic (f)_k) = (0.1)(9.8√3) = 0.98√3 AmaNewton = 1.69 AmaNewton

Isixazululo:

Into iphumule uma u-w_x < f_s, into iya phansi uma u-w_x > f_s.

w_x = 9.8 uNewton no-f_s = AmaNewton angu-3.39.

(a) amandla aphelele

∑F = w_x - f_k = 9.8 – 1.69 = 8.11 Newton

(b) ubukhulu kanye nesiqondiso sokusheshisa

∑F = ma

8.11 = (2) a

a =4.05

Ubukhulu bokusheshisa = 4.05 m/s² kanye nesiqondiso sokusheshisa = phansi.

2. Isisindo sento = 4 kg, ukusheshisa ngenxa yamandla adonsela phansi = 9,8 m/s². I-coefficient ye-kinetic friction = 0.2 kanye ne-coefficient ye-static friction = 0.4. Ubukhulu bamandla F = 40 Newtons. Into iphumule noma ishelela phansi? Uma into ishelela phansi, thola (a) amandla aphelele (b) ubukhulu kanye nesiqondiso sokusheshisa!

Isixazululo

Kwaziwa:

Isisindo (m) = 4 kg

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 9.8 m/s²

I-coefficient yokungqubuzana okungaguquki (μ_s) = 0.4

I-coefficient yokungqubuzana kwe-kinetic (μ_k) = 0.2

Isisindo (w) = mg = (4)(9.8) = 39.2 amaNewton

Ingxenye evundlile yesisindo (w_x) = isono 30^o = (39.2)(0.5) = 19.6 Newton

Ingxenye eqondile yesisindo (w_y) = w cos 30^o = (392)(0..5√3) = 19.6√3 AmaNewton

Amandla avamile (N) = w_y = 19.6√3 AmaNewton = 33.95 AmaNewton

amandla okungqubuzana okungaguquki (f)_s) = μ_s N= (0,4)(33.95) = 13.58 amaNewton

Amandla okungqubuzana kwe-kinetic (f)_k) = μ_k N= (0.2)(33.95) = 6.79 amaNewton

F = 40 Newton

Isixazululo:

Into iyashelela phansi uma u-F < w_x +f_sInto iyashelela phezulu uma u-F > w_x +f_s.

F = 40 Newton, w_x = 19.6 uNewton no-f_s = AmaNewton angu-13.58.

U-F mkhulu kuno-w_x +f_s ngakho into iyashelela phezulu.

(a) Amandla aphelele

∑F = F – w_x - f_k = 40 – 19.6 – 6.79 = 13.61 amaNewton

(b) Ubukhulu kanye nesiqondiso sokusheshisa

∑F = ma

6.4 = (4) a

a =1.6

Ubukhulu bokusheshisa buyi-1.6 m/s² futhi isiqondiso sokusheshisa siphezulu.

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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