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

1. Isisindo sento = 2 kg, ukusheshisa ngenxa yamandla adonsela phansi = 9.8 m/s ² , i-coefficient ye -static friction = 0.2, i-coefficient ye-kinetic friction = 0.1. Ingabe into iphumule noma iyasheshisa? Uma into isheshisiwe, thola (a) amandla aphelele (b) ubukhulu kanye nesiqondiso sokusheshisa kwebhokisi!

Isixazululo

Kwaziwa:

Isisindo (m) = 2 kg

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 9.8 m/s ²

I-Coefficient yokungqubuzana okungaguquki ( μs ₎ = 0.2

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

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

Ingxenye evundlile yesisindo ( w _x ) = w sin 30 ^o = (19.6)(0.5) = 9.8 Newtons

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

Amandla ajwayelekile (N) = w _y = 9.8√3 AmaNewton

Amandla okungqubuzana okungaguquki (fs ₎ = (0.2)(9.8√3) = 1.96√3 Newton = 3.39 Newton

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

Isixazululo:

Into iphumule uma u-w _x < _fs , into ihamba phansi uma u-w _x > _fs.

w _x = 9.8 AmaNewton kanye no-f _s = 3.39 AmaNewton.

(a) amandla aphelele

∑ F = w _x – f _k = 9.8 – 1.69 = 8.11 AmaNewton

(b) ubukhulu kanye nesiqondiso sokusheshisa

∑ F = ma

8.11 = (2) a

a =4.05

Ubukhulu bokusheshisa = 4.05 m/s ² kanye nesiqondiso sokusheshisa = phansi.

[irp]

2. Isisindo sento = 4 kg, ukusheshisa ngenxa yamandla adonsela phansi = 9,8 m/s ² . 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/s ²

I-coefficient yokungqubuzana okungaguquki ( μs ₎ = 0.4

I-coefficient ye-kinetic friction ( μk ₎ = 0.2

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

Ingxenye evundlile yesisindo (w _x ) = w sin 30 ^o = (39.2)(0.5) = 19.6 Newtons

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

Amandla ajwayelekile (N) = w _y = 19.6√3 AmaNewton = 33.95 AmaNewton

amandla okungqubuzana okungaguquki (fs ₎ = μs _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 ishelela phansi uma F < w _x + fs _. Into ishelela phezulu uma F > w _x + _fs.

F = 40 Newtons, w _x = 19.6 Newtons kanye fs ₌ 13.58 Newtons.

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/s ² 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