Izibonelo ezimbili zokusebenzisa imithetho kaNewton ohlelweni lomthwalo wezintambo kanye ne-pulley
1. Isisindo sebhulokhi 1 singama-2 kg, isisindo sebhulokhi 2 singama-3 kg, ukusheshisa okubangelwa amandla adonsela phansi kungu-10 m/s2. Nquma (a) ubukhulu kanye nesiqondiso sokusheshisa kwesistimu (b) ubukhulu bamandla okucindezela entanjeni!
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Izibonelo ezi-4 zemibuzo mayelana nokusetshenziswa kwemithetho kaNewton ekuhambeni okuqondile kwe-lift noma i-lifti
1. Umuntu onesisindo esingama-50 kg usesiliftini. Ukusheshisa ngenxa yamandla adonsela phansi = 10 m/s2Thola ubukhulu bamandla avamile asetshenziswa yiphansi le-lifti kumuntu uma:
(a) ilifti ethule
(b) ilifti yehla ngesivinini esingaguquki
(c) ilifti ikhuphukela phezulu ngesivinini esingu-5 m/s2
(d) ilifti yehla ngesivinini esingu-5 m/s2
(e) ilifti yokuwa yamahhala
Izibonelo ezimbili zokusebenzisa imithetho kaNewton endaweni ebushelelezi (akukho ukungqubuzana)
1. Isisindo sebhulokhi singama-2 kg, ukusheshisa ngenxa yamandla adonsela phansi = 10 m/s2. Nquma (a) amandla aphumela ekusheshiseni ibhloko (b) ubukhulu bokusheshisa kwebhloko.
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Izibonelo ezimbili zokusebenzisa imithetho kaNewton ezindizeni ezithambekele kabi (kukhona ukungqubuzana)
1. Isisindo sebhulokhi singama-2 kg, ukusheshisa ngenxa yamandla adonsela phansi = 10 m/s2, i-coefficient ye-static kanye ne-kinetic friction ingu-0,2 kanye no-0,1. Ingabe ibhloko isamile noma iyahamba? Uma ibhloko ihamba, nquma (a) amandla aphumela ekusheshiseni ibhloko (b) ubukhulu kanye nesiqondiso sokusheshisa kwebhloko!
Ingxoxo
Umthetho wokulondolozwa komfutho oqondile ithi uma kungekho mandla angaphandle asebenza ezintweni ezimbili ezishayisanayo khona-ke umfutho into engaphambi kokushayisana ifana nomfutho wento engemva kokushayisana.
Imininingwane:
m1 = isisindo sento 1, m2 = isisindo sento 2
Izinto Zokungqubuzana Ezingenasici
Ekungqubuzaneni okungaphelele (ukungqubuzana okungaphelele), umthetho wokulondolozwa komfutho uyasebenza , kanti umthetho wokulondolozwa kwamandla e-kinetic awusebenzi. Ngesikhathi sokungqubuzana, amanye amandla e-kinetic aguqulwa abe amandla omsindo, amandla okushisa, kanye namandla angaphakathi. Ukusetshenziswa kwegama elithi i-elastic kubonisa ukuthi ngemva kokungqubuzana, izinto ezimbili azihlangani zibe yinye noma zinamathele ndawonye, kodwa kunalokho ziyagxuma. Isibonelo sokungqubuzana okungaphelele ukungqubuzana okunobukhulu obubodwa phakathi kwamamabula amabili noma amabhola amabili ebhiliyadi.
Ukungqubuzana phakathi kwezinto kubizwa ngokuthi ukungqubuzana okunwebeka ngokuphelele uma amandla okunyakaza kanye namandla okunyakazisa ento ngayinye ngaphambi kokungqubuzana elingana namandla okunyakaza kanye namandla okunyakazisa ento ngayinye ngemva kokungqubuzana. Ngamanye amazwi, ekungqubuzaneni okunwebeka ngokuphelele, umthetho wokulondolozwa kokunyakaza kanye nomthetho wokulondolozwa kwamandla okunyakazisa ukunyakaza kuyasebenza. Ukusetshenziswa kwegama elithi elastic kubonisa ukuthi ngemva kokungqubuzana, izinto ezimbili azihlangani zibe yinto eyodwa noma azinamatheli ndawonye kodwa ziyagxumagxuma.
Ekungqubuzaneni okungaphelele (ukungqubuzana okungaphelele), umthetho wokulondolozwa komfutho uyasebenza , kanti umthetho wokulondolozwa kwamandla e-kinetic awusebenzi. Ngesikhathi sokungqubuzana, amanye amandla e-kinetic aguqulwa abe amandla omsindo, amandla okushisa, kanye namandla angaphakathi. Ukusetshenziswa kwegama elithi i-elastic kubonisa ukuthi ngemva kokungqubuzana, izinto ezimbili azihlangani zibe yinye noma zinamathele ndawonye, kodwa kunalokho ziyagxuma. Isibonelo sokungqubuzana okungaphelele ukungqubuzana okunobukhulu obubodwa phakathi kwamamabula amabili noma amabhola amabili ebhiliyadi.
1. Isisindo (w)
Amandla adonsela phansi, noma ngokuvamile afushaniswa njengesisindo, amandla adonsela phansi asebenza entweni enobunzima. Uphawu lwamandla adonsela phansi ngu-w, olumele isisindo.
Ifomula yokubala amandla adonsela phansi ivela kufomula Umthetho wesibili kaNewton :
F = ma
Kusetshenziswa ukubala amandla adonsela phansi:
w = mg
I-Keterangan :
F = amandla (iyunithi yamazwe ngamazwe = iNewton)
w = amandla adonsela phansi (iyunithi yamazwe ngamazwe = iNewton)
m = isisindo sento (amayunithi aphesheya = kg)
kuze = ukusheshisa (iyunithi yamazwe ngamazwe = m/s2)
g = ukusheshisa ngenxa yamandla adonsela phansi (amayunithi aphesheya = m/s2)
1. Incazelo yesitayela
Amandla yinto ebangela ukuba izinto zizizwe ukusheshisaNgamanye amazwi, amandla yinto ehambayo, evimba noma eshintsha indlela yokunyakaza kwento.
Isitayela ubuningi bevektha Ngakho-ke, amandla anobukhulu kanye nesiqondiso. Uphawu lwamandla ngu-F (Amandla). U-F uphawu olujwayelekile lwamandla. Kunezinhlobo eziningana zamandla, futhi akuzona zonke izinhlobo zamandla ezinophawu u-F. Iyunithi yamandla yamazwe ngamazwe ingu-kg m/s2 noma uNewton.