Izibonelo ezi-7 zokunyakaza okujikelezayo okushintshayo ngokulinganayo
1. I-propeller eqale iphumule, ijikeleza ngokusheshisa okungaguquki kwe-angle okungu-2 rad/s.2Nquma ukusheshisa kwe-angular kanye nejubane le-angular le-propeller ngemuva kwemizuzwana emi-2. Ziveze ngama-radians namasekhondi.
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I-Diketahui :
Kubuziwe : ukusheshisa kwe-angular kanye nejubane le-angular ngemva kwemizuzwana emi-2
Izibonelo eziyi-11 zezinkinga zokunyakaza okujikelezayo okufanayo
1. Inhlayiya ihamba ngendilinga enejubane elingaguquki le-angle elingu-10 rad/s. Thola (a) ijubane le-angle lenhlayiya ngemva kwemizuzwana eyi-10 (b) i-engeli engaphansi kwenhlayiya ngemva kwemizuzwana eyi-10.
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(a) ijubane le-angular ngemva kwemizuzwana eyi-10
Ukusheshisa kuyinani le-vector, inani elibonakalayo elinobukhulu kanye nesiqondiso. Uphawu lwayo yi- ( ukusheshisa ) . Iyunithi yayo yamazwe ngamazwe ingama-meter ngomzuzwana oyisikwele, okufingqiwe ngokuthi m/s 2.
Ukusheshisa Okumaphakathi
Isibonelo sezinkinga.
Imoto eqala ingami imizuzwana emi-5 bese iya empumalanga ngesivinini esingamamitha ayi-10/s. Thola isilinganiso sokusheshisa.
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Uma ucindezela incwadi etafuleni ize ihambe, usuke wenza umsebenzi encwadini. Uma into iwela ebusweni bomhlaba ngoba idonswa ngamandla adonsela phansi , amandla adonsela phansi ayasebenza entweni. Ngokuphambene nalokho, uma ucindezela into ngamandla akho onke uze ujuluke kodwa into ingahambi, awukasebenzi entweni. Empilweni yansuku zonke, kuthiwa wenze umsebenzi noma umsebenzi onzima ucindezela into, kodwa ngokwesayensi yefiziksi, awukasebenzi entweni ngoba into ayizwani nokufuduka (into ayishintshi indawo).
Izinto ze-Angular Momentum
Into eyenzayo ukunyakaza okuqondile inomfutho ongabalwa kusetshenziswa ifomula:
p = mv
Imininingwane:
p = umfutho (iyunithi yamazwe ngamazwe iyi-kilogram imitha / isekhondi, efingqiwe kg m/s)
m = isisindo (iyunithi yamazwe ngamazwe ingamakhilogramu, ifinyeziwe ingamakhilogramu)
v = isivinini (iyunithi yamazwe ngamazwe iyimitha / isekhondi, efingqiwe m/s)
Inani elibonakalayo ekujikelezeni okufana nobunzima (m) ekuhambeni okuqondile liyi umzuzu wokungakhathali (I). Inani elibonakalayo ekujikelezeni okufana nejubane (v) ekuhambeni okuqondile liyi ijubane le-angularNgakho-ke, into ejikelezayo inomfutho ongabalwa kusetshenziswa ifomula:
Isikhathi Sokungakwazi Ukugxila Kwezinto Ezibalulekile
Kunezinto ezimbili, enye yazo inobunzima obuncane kanti enye inobunzima obukhulu. Iyiphi into elula ukuyihambisa uma icindezelwa ngamandla afanayo? Iqiniso libonisa ukuthi izinto ezinobunzima obuncane kulula ukuzihambisa kunezinto ezinobunzima obukhulu. Ngakho-ke ubukhulu besisindo sento bunquma ubukhulu bokusheshisa kwento uma kusetshenziswa amandla. Uma kunyakaza okuqondile, ubunzima bento bunquma ukuthi into kulula noma kunzima ukuyihambisa (ukusheshisa) khona-ke ekuhambeni okujikelezayo, umzuzu wokungashukumi kwento unquma ukuthi into kulula noma kunzima ukuyihambisa.
Izinto Zesikhathi Samandla (I-Torque)
Izingalo Zesitayela
Cabanga ngento ejikelezayo, njengomnyango. Uma umnyango uvuliwe noma uvaliwe, uyajikeleza. I-hinge exhumanisa umnyango nodonga isebenza njenge-axis yokujikeleza.
Isithombe somnyango obonakala phezulu. Cabanga ngesibonelo lapho umnyango ucindezelwa ngamandla amabili, lapho womabili la mandla enobukhulu obufanayo kanye nesiqondiso; isiqondiso samandla siqonde ngqo emnyango.
Ngaphambilini wake wafunda umthetho wesibili kaNewton ovezwa nge-equation:
Lesi sibalo sichaza ubudlelwano phakathi kwamandla aphumayo, aziwa nangokuthi amandla aphelele, kanye nobukhulu kanye nokusheshisa. Amandla aphumayo asebenza entweni enobukhulu abangela ukuba into isheshise.
Kulokhu sizokwethula olunye uhlobo lomthetho wesibili kaNewton, oluchaza ubudlelwano phakathi kwamandla aphumayo kanye noshintsho emgudwini.
Ijubane liyinani le-vector, kuyilapho ijubane liyinani le-scalar. Ijubane linokukhulu kanye nesiqondiso, kuyilapho ijubane linokukhulu kuphela. Iyunithi yamazwe ngamazwe ingamamitha ngomzuzwana, efingqiwe ngokuthi m/s noma ms -1 . Uphawu lwayo ngu -v ( ijubane ).
Isivinini esimaphakathi kanye nesivinini esimaphakathi
Funda futhi izibonelo zejubane eliqondile kanye nejubane eliyi-angular.
Uma into ijikeleza ngokwewashi futhi iqedela ukujikeleza okukodwa (360o) ngomzuzwana o-1, khona-ke ijubane le-angular lazo zonke izingxenye zefeni lingukujikeleza okungu-1/umzuzwana = 360 o /umzuzwana = 6,28 ama-radians/umzuzwana futhi isiqondiso sejubane le-angular sihambisana newashi. Uma i-radius yefeni ingu-20 cm, umphetho wefeni uhamba ngendilinga ngesivinini esingu- (2)(3,14)(20 cm) / umzuzwana o-1 = 125,6 cm/s = 1,256 m/s. Iphuzu elingu-1 cm (0,01 m) ukusuka ku-axis lihamba ngendilinga ngesivinini esingu- (2)(3,14)(1 cm) / umzuzwana o-1 = 6,28 cm/s = 0,0628 m/s. Uma i-r encane, ijubane lincane. Ekunyakazeni okujikelezayo , ijubane livame ukubizwa ngokuthi ijubane le-tangential. Libizwa ngokuthi i-tangential ngoba isiqondiso sejubane sihlala sihambisana nendlela ejikelezayo.