Izibonelo Eziyi-9 Zemibuzo Yomthetho KaHooke
1. Igrafu yobudlelwano phakathi kwamandla (F) nokwanda kobude (x) iboniswe esithombeni esingezansi. I-spring constant esekelwe kugrafu ithi…
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Ifomula Umthetho kaHooke :
k = F/x
Imininingwane:
F = amandla (iyunithi yamazwe ngamazwe yiNewton, efingqiwe N)
k = i-spring constant (iyunithi yamazwe ngamazwe yi-Newton/meter, efingqiwe yi-N/m)
x = ukwanda kobude (iyunithi yamazwe ngamazwe ingamamitha, efingqiwe ngo-m)
1. Ibhola A nebhola B, ngalinye linesisindo esingamagremu angu-200, lishayisana ngendlela ethambile ngokuphelele. Uma ngaphambi kokushayisana, ibhola A lihamba ngesivinini esingu-10 m/s kanti ibhola B liphumulile, khona-ke isivinini sebhola A nebhola B ngemva kokushayisana...
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I-Diketahui :
Isisindo sebhola A (mA) = amagremu angu-200 = 0,2 kg
Isisindo sebhola B (mB) = amagremu angu-200 = 0,2 kg
Isivinini sebhola A ngaphambi kokushayisana (v)A) = 10 m/s
Isivinini sebhola B ngaphambi kokushayisana (v)B= = 0
1. Inhlamvu enesisindo esingamagremu angu-30 ehamba ngesivinini esingama-30 m/s ishaya ibhlogo lokhuni elinesisindo esingama-1 kg eliphumule. Thola isivinini sebhloko uma inhlamvu ifakiwe ebhlokini!
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I-Diketahui :
Isisindo senhlamvu (m1) = amagremu angu-30 = 0,03 kg
Isisindo sebhulokhi (m2) = 1 kg
Ijubane lokuqala lenhlamvu (v)1) = 30 m/s
Ijubane lokuqala lebhulokhi (v)2) = 0 (ibhulokhi emile)
Kubuziwe : isivinini senhlamvu kanye nebhulokhi ngemva kokushayisana (v')
3 Izibonelo zokushayisana okunwebeka kancane
1. Into engamagremu angu-500 ihamba ngesivinini esingu-10 m/s kanti into engamagremu angu-200 ihamba ngesivinini esingu-12 m/s. Lezi zinto ezimbili ziyasondelana bese zishayisana. Uma ngemva kokushayisana, isivinini sento engamagremu angu-500 singama-6 m/s, khona-ke isivinini sento engamagremu angu-200…
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I-Diketahui :
Isisindo sento 1 (m1) = amagremu angu-500 = 0,5 kg
Isisindo sento 2 (m2) = amagremu angu-200 = 0,2 kg
Ijubane lokuqala lento 1 (v)1) = -10 m/s
Ijubane lokuqala lento 2 (v)2) = 12 m/s
Ijubane lokugcina lento 1 (v)1') = 6 m/s
Izibonelo eziyi-8 zemibuzo ye-Linear Momentum
1. Into enesisindo esingu-1 kg ihamba ngesivinini esingu-10 m/s. Momentum into...
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I-Diketahui :
IMisa (m) = 1 kg
Isivinini (v) = 10 m/s
Kubuziwe : umfutho oqondile (p)
Jawab :
Ifomula ye-Momentum: p = mv
Incazelo: p = umfutho, m = isisindo, v = isivinini.
Umfutho wento uthi:
p = mv = (1)(10) = 10 kg m/s2
Izibonelo eziyi-11 zemibuzo ye-Momentum kanye ne-Impulse
1. Ibhola elinesisindo esingu-0,2 kg liphonswa ngokuvundlile ngesivinini esingu-10 m/s bese lishaya udonga, bese ibhola libuyela emuva ngesivinini esifanayo. Ushintsho emgudwini webhola...
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Izibonelo eziyi-16 zemibuzo ngoMthetho Wokulondolozwa Kwamandla Emishini
Umthetho wokulondolozwa kwamandla omshini ekuhambeni kokuwa okukhululekile
1. Ikhukhunathi enesisindo esingamakhilogremu ama-2 liwa ngokukhululeka lisuka ekuphakameni kwamamitha ayi-6. Amandla e-kinetic ekhukhunathi uma lifika phansi angu… g = 10 m/s2
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I-Diketahui :
Isisindo sikakhukhunathi (m) = 2 kg
Ukuphakama (h) = amamitha ayi-6
Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s2
Kubuziwe amandla e-kinetic (EK)
2 Izibonelo zemibuzo yamandla
Amandla yisilinganiso lapho umsebenzi wenziwa khona ibhizinisi noma imizamo eyenziwe phakathi nesikhathi esithile.
Ngokwe-metametric, amandla yisilinganiso somzamo nesikhathi.
P=W/t
Incazelo: P = amandla (iyunithi iJoule/isekhondi), W = umsebenzi (iJoule) kanye no-t = isikhawu sesikhathi (isekhondi)
Ngokusekelwe kulesi sibalo, kungaphethwa ngokuthi uma izinga lomsebenzi lenyuka, amandla eba maningi, ngokuphambene nalokho, izinga lomsebenzi lincane, amandla ancipha.
Amandla ayinani elilinganiselwe. Uhlelo lwamazwe ngamazwe lwamayunithi amandla yi-joule/yesibili. I-Joule/yesibili = watt (efushanisiwe u-W), eqanjwe ngokuhlonipha uJames Watt.
Uhlelo lwaseBrithani lwamayunithi amandla luyi-1 pound-foot-force ngomzuzwana. Le yunithi incane kakhulu ngezinjongo ezingokoqobo, ngakho-ke kusetshenziswa iyunithi enkulu, i-horsepower (efushanisiwe hp),. I-1 horsepower = 550 pound-foot-force ngomzuzwana = 764 watts = ¾ kilowatt.
1. Isipilingi sinikezwa umthwalo ongama-2 kg bese silenga siqonde phezulu esitendini. Uma isipilingi sikhula ngo-4 cm, khona-ke ushintsho ku- amandla angase abe khona Amandla okunwebeka entwasahlobo angu… g = 10 m/s2
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I-Diketahui :
Isisindo somthwalo (m) = 2 kg
Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s2
Isisindo somthwalo (w) = mg = (2)(10) = 20 Newton
Ukwanda kobude bentwasahlobo (x) = 4 cm = 0,04 amamitha
Kubuziwe : Amandla anamandla okunwebeka entwasahlobo
1. Into enesisindo esingu-1 kg ukuwa kwamahhala kusukela ekuphakameni kwamamitha ayi-10 kuya ebusweni bomhlaba. Thola:
(a) Umsebenzi owenziwe ngamandla adonsela phansi entweni
(b) Izinguquko amandla angase abe khona amandla adonsela phansi
Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s2
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I-Diketahui :
Isisindo sento (m) = 1 kg
Ukuphakama (h) = amamitha ayi-10
Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s2
Impendulo:
(a) Umsebenzi owenziwe ngamandla adonsela phansi
Uma into iwela ngokukhululeka, indlela yokuhamba kwento ibheke phansi kanti indlela yamandla adonsela phansi asebenza entweni (isisindo sento) nayo ibheke phansi. Ngenxa yokuthi asendleleni efanayo, amandla adonsela phansi ayahlangana noma akha i-engeli engu-0.o ngesiqondiso sokunyakaza kwento. I-Cos 0 = 1 futhi yonke inombolo ephindwe ngo-1 iyafana naleyo nombolo, ngakho-ke i-cos 0 ayidingi ukufakwa kufomula yomsebenzi.
Ifomula yomsebenzi ingu-W = F s, lapho u-W = umsebenzi, u-F = amandla kanye no-s = ukufuduka. Uma ilungiswa kule nkinga, ifomula yomsebenzi ishintshela ku-W = wh = mgh, lapho u-W = umsebenzi, u-w = amandla adonsela phansi, u-h = ushintsho ekuphakameni kwento, u-m = isisindo sento, u-g = ukusheshisa ngenxa yamandla adonsela phansi.
Ngakho-ke umsebenzi owenziwe ngamandla adonsela phansi uwukuthi:
W = wh = mgh = (1)(10)(10) = ama-Joules ayi-100