Isibonelo semibuzo yamandla okungqubuzana

Izibonelo Ezi-6 Zemibuzo Yamandla Okungqubuzana

1. Ibhulokhi enesisindo esingu-1 kg iphumule endaweni eyisicaba eqondile. I-coefficient yokungqubuzana okungaguquki ingu-0,4 kanti ukusheshisa okubangelwa amandla adonsela phansi kungu-10 m/s.²Thola (a) ubukhulu bamandla okungqubuzana angaguquki (b) amandla amancane okuqinela F ukuze ibhlogo liqale ukuhamba!
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I-Diketahui :
Kubuziwe :
(a) Ubukhulu bamandla okungqubuzana angaguquki (b) Ubukhulu bamandla okuxhuzula amancane (F)
Jawab :
(A) Ubukhulu bamandla okungqubuzana okungaguquki (f)_s)
(B) Amandla amancane okudonsa (F)
Uma into idonswa ngamandla F kodwa into isaphumule, khona-ke ukungqubuzana okungaguquki kusebenza entweni. Uma into idonswa ngamandla F futhi into isivele ihamba, khona-ke ukungqubuzana kwe-kinetic kusebenza entweni. Ukungqubuzana okungaguquki kuvimbela ukunyakaza kwento futhi njengoba kuboniswe esithombeni, isiqondiso sokungqubuzana okungaguquki siphambene nesiqondiso samandla okudonsa (F). Uma amandla okudonsa (F) enobukhulu obufanayo namandla okudonsa angaguquki, khona-ke into izohamba (into ihlala iphumule). Into iqala ukuhamba lapho amandla okudonsa makhulu kune-static friction force.
Ngakho-ke amandla amancane okudonsa (F) ukuze ibhloko liqale ukuhamba angama-Newton angu-4.

2. Ibhloko elinobunzima obuyi-1 kg elibekwe endaweni eyisicaba eqondile lidonswa ngamandla F ngendlela yokuthi ibhloko lihambe ngendlela eqondile ngesivinini esingaguquki. Uma i-coefficient ye-kinetic friction ingu-0,1. Thola ubukhulu bamandla okudonsa F! (g = 10 m/s²)  
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I-Diketahui :
Kubuziwe : F
Jawab :
Ibhlokhi elihamba ngomugqa oqondile ngesivinini esingaguquki = ibhlokhi elihamba ngesivinini esingaguquki = ibhlokhi elihamba ngaphandle kokusheshisa. Umthetho Wokuqala KaNewton uthi uma amandla avelayo esebenza entweni = 0 khona-ke into iphumule noma ihamba ngesivinini esingaguquki.
Ibhlokhi lihamba ngesivinini esingaguquki, ngakho-ke amandla aphumayo asebenza ebhlokini = 0. Ukuze amandla aphumayo abe = 0, ngaphezu kwamandla okudonsa u-F ngakwesokudla, kumele kube namandla anobukhulu obufana no-F kodwa aqondiswe kwesobunxele. Amandla okukhulunywa ngawo amandla okungqubuzana kwe-kinetic, amandla okungqubuzana kwe-kinetic asebenza ebhlokini lapho into ihamba. Ngokwezibalo:
Ngenxa yokuthi into ihamba ngendlela eqondile ngesivinini esingaguquki, ubukhulu bamandla okudonsa u-F = f_s = 1 uNewton

3. Ibhokisi elinesisindo esingu-1 kg liyashelela phansi ngesivinini esingaguquki endizeni ethambekele kakhulu. Thola i-coefficient ye-kinetic friction… (g = 10 m/s²)
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Isihlokwana:
w = amandla adonsela phansi, w_x = ingxenye yamandla adonsela phansi ehambisana nobuso bendiza ethambekele, w_y = ingxenye yamandla adonsela phansi aqonde ngqo endizeni ethambekele, N = amandla avamile, f_k = amandla okungqubuzana kwe-kinetic.

Jawab :
Ibhokisi lishelela phansi ngesivinini esingaguquki, ngakho-ke amandla aphumayo = 0. Ibhokisi lihamba phezu kobuso bendiza ethambekele, lapho phezu kobuso bendiza ethambekele kukhona amandla w_x kanye no-f_kLa mandla amabili anobukhulu obufanayo kodwa aneziqondiso eziphambene ngakho amandla aphumayo = 0.

[IsiNgisi: Amandla okungqubuzana okungaguquki kanye nokujiya – izinkinga nezixazululo ]

4. Uma isisindo sento singama-4 kg, i-engeli yokuthambekela ingu-30^o kanye nokusheshisa kwamandla adonsela phansi okungu-10 ms^-2 Into izoqhubeka nokushelela. Inani eliphezulu le-coefficient of friction phakathi kwento kanye nendiza ethambekele lingu…
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Kuyaziwa ukuthi:
m = 4 kg, g = 10 m/s²
Kubuziwe: i-coefficient ephezulu yokungqubuzana?
Impendulo:
I-static friction coefficient inkulu kune-kinetic friction coefficient, ngakho-ke okushiwo yi-maximum friction coefficient yi-maximum static friction coefficient.
Izinto azihambi ngendlela eqondile:
Faka esikhundleni u-f_s ku-equation 1 no-f_s ku-equation 2.
5. Uma into ibekwa endaweni elukhuni bese idonswa ngamandla, kuzovela amandla aphikisayo abizwa ngokuthi ukungqubuzana. Ubukhulu bamandla okungqubuzana buxhomeke...
A. ubulukhuni bomphezulu wokungqubuzana
B. ubukhulu bamandla avamile
C. ubulukhuni bezindawo zokungqubuzana kanye nobukhulu bamandla ajwayelekile
D. isisindo sento edonswayo
E. ubukhulu bamandla adonsela into
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Ukungqubuzana okuqinile kusebenza lapho into idonswa kodwa ingakahambi. Ukungqubuzana kwe-kinetic kusebenza lapho into inyakaza.
Uma into isendaweni eyisicaba khona-ke u-N = w = mg
Uma into isendaweni ethambekele khona-ke u-N = w_y = w cos theta (bheka isibonelo senkinga 1)
Incazelo: f_s = amandla okungqubuzana okungaguquki, f_k = amandla okungqubuzana kwe-kinetic, N = amandla avamile, w = amandla adonsela phansi = isisindo sento, g = ukusheshisa ngenxa yamandla adonsela phansi.
Uma inkinga ibhekisela endaweni eyisicaba ebukhali, khona-ke ubukhulu bamandla okungqubuzana buxhomeke ekuqineni kobuso (i-friction coefficient) kanye namandla ajwayelekile (N).
Impendulo efanele ngu-C.

6. Ubukhulu bamandla okungqubuzana entweni ehamba endizeni ethambekele buxhomeke...
A. isisindo sento kanye nesivinini sento
B. i-engeli yokuthambekela kwendiza endizeni evundlile kanye nesivinini sento
C. amandla avamile kanye nobulukhuni bomphezulu wento
D. isisindo sento kanye ne-engeli yokuthambekela kwendiza endizeni evundlile
E. ubulukhuni bomphezulu wendiza kanye nesivinini sento
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Ifomula yamandla aphezulu okungqubuzana okungaguquki endizeni ethambekele:
Impendulo efanele ngu-C.
Ngenkathi i-coefficient of friction incike kuphela engela yokuthambekela endaweni evundlile (theta).