Isimiso samandla okusebenza-okusebenza ngomshini

Isimiso samandla okusebenza nokwemishini

Ithiyori yamandla okusebenza-kinetic ithi umsebenzi we-net noma umsebenzi owenziwe amandla e-net ulingana noshintsho lwamandla e-kinetic.

I-W _inethi = TO _t – TO _o = 1⁄2 m(v _t² – _vo² )

I-W _net = Kunezinhlobo ezimbili zamandla, okungukuthi amandla okulondoloza, kanye namandla angewona awokulondoloza. Ngakho-ke, umsebenzi we-net ungabhekwa njengowakhiwe umsebenzi owenziwe amandla okulondoloza kanye nomsebenzi owenziwe amandla angewona awokulondoloza.

W _c + W _nc = ΔKE

Umsebenzi owenziwa amandla alondolozayo ulingana noshintsho olubi emandleni angaba khona:

W_c= -ΔPE

– ΔPE + W_nc = ΔKE

W_nc = ΔPE + ΔKE

I-Wnc = ΔME

Isibalo esingenhla sithi umsebenzi owenziwa amandla angewona awokugcina izinto entweni ulingana noshintsho emandleni okusebenza entweni. Amandla okusebenza = amandla angase abe khona + amandla e-kinetic. Amandla angase abe khona angathatha isimo samandla angase abe khona adonsela phansi noma amandla angase abe khona anwebekayo.

Isibonelo sombuzo: Ithiyori yamandla okusebenza-okusebenza

Ibhokisi elingama-2 kg liqala lihamba ngesivinini esingu-10 m/s. Ngemva nje kwalokho, ibhokisi liyama. I-coefficient of kinetic friction phakathi kwebhokisi nephansi ingu-0.2. Ukusheshisa kwamandla adonsela phansi kungu-10 m/s². Kungakanani ukufuduka kwebhokisi?

Ingxoxo:

Kuhlonzwe: m = 2 kg, v_o = 10 m/s, vt = 0, k = 0.2, w = mg = (1 kg)(10 m/s²) = 10 kg m/s² = AmaNewton ayi-10,

Kubuziwe: inani lokufuduka kwebhokisi (ama) Isimiso samandla okusebenza nokwemishini 1

Ithiyori yamandla okusebenza-okusebenza:

W_nc = ΔME

W_nc = ΔPE + ΔKE

Ukuphakama (h) kuhlala kungaguquki noma akukho shintsho ekuphakameni, ngakho-ke akukho shintsho emandleni adonsela phansi.

I-Wnc = ΔKE

Umsebenzi owenziwa amandla okungqubuzana kwe-kinetic yilo:

W_nc= – f_k s = μ_k N -s = μ_k w -s = μk mg -s

W_nc = – (0.2)(2)(10)(s) = – (4)(s)

Amandla okungqubuzana kwe-kinetic enza umsebenzi ongemuhle (amandla okungqubuzana kwe-kinetic akwelinye icala eliphambene nokufuduka kwento)

Ushintsho kumandla e-kinetic:

ΔKE = 1⁄2 m (v_t² - v_o²) = 1⁄2 (2)(0²- 10²) = (0 – 100) = – 100

Ukufuduka kwento:

W_nc = ΔKE

– (4)(s) = – 100

s = – 100 / – 4 = amamitha angu-25

Imibuzo nezimpendulo ezingu-20 eziphathelene nomgomo wamandla okusebenza-okusebenza:

1. Umbuzo: Iyini isimiso samandla okusebenza-okusebenza ngomshini? Impendulo: Umgomo wamandla okusebenza-okusebenza uthi umsebenzi owenziwa entweni ulingana noshintsho lwamandla ayo okusebenza.

2. Umbuzo: Umsebenzi uchazwa kanjani ku-physics? Impendulo: Umsebenzi uchazwa njengomkhiqizo wamandla asetshenziswa entweni kanye nebanga elihamba ngalo liye ohlangothini lwamandla

3. Umbuzo: Yini eyakha amandla omshini? Impendulo: Amandla omshini aqukethe amandla okunyakaza kwento kanye namandla angase abe khona.

4. Umbuzo: Uma kungekho amandla angewona awokugcina izinto, yini engashiwo ngamandla aphelele okusebenza kohlelo oluvaliwe? Impendulo: Amandla aphelele okusebenza kwemishini ahlala engaguquki.

5. Umbuzo: Nikeza isibonelo samandla alondolozayo. Impendulo: Amandla adonsela phansi ayisibonelo samandla alondolozayo.

6. Umbuzo: Amandla angase abe khona ahluke kanjani kumandla e-kinetic? Impendulo: Amandla angaba khona amandla abangelwa yisikhundla, njengokuphakama ngaphezu komhlaba, kanti amandla e-kinetic abangelwa ukunyakaza.

7. Umbuzo: Umsebenzi owenziwa amandla alondolozayo uhlobana kanjani namandla angase abe khona? Impendulo: Umsebenzi owenziwa amandla alondolozayo ulingana noshintsho olubi emandleni angaba khona.

9. Umbuzo: Isimiso samandla okusebenza-okusebenza sichaza kanjani ukuguqulwa kwamandla angaba khona abe amandla e-kinetic entweni ewa ngokukhululeka? Impendulo: Njengoba into iwa, amandla ayo angase abe khona ayancipha futhi amandla ayo e-kinetic ayanda ngenani elilinganayo, okugcina amandla aphelele omshini engaguquki.

10. Umbuzo: Kwenzekani emandleni okusebenza kohlelo lapho amandla angewona awokugcina izinto, njengokungqubuzana, esebenza kulo? Impendulo: Amandla okusebenza ayancipha ngoba amandla angewona awokugcina izinto achitha amandla, ngokuvamile njengokushisa.

11. Umbuzo: Ingabe amandla omshini wohlelo anganda? Impendulo: Yebo, uma umsebenzi wangaphandle usuqediwe ohlelweni.

12. Umbuzo: Umqondo womsebenzi uhlobene kanjani namandla? Impendulo: Umsebenzi uyindlela amandla adluliselwa noma aguqulwa ngayo ohlelweni.

13. Umbuzo: Uma into ihamba ngesivinini esingaguquki, yini engashiwo ngomsebenzi wenethi owenziwa kuyo? Impendulo: Umsebenzi we-net owenziwe kuwo awukho ngoba akukho ukusheshisa okwenzekayo.

15. Umbuzo: Kungani isiphethu esicindezelwe sinamandla angase abe khona? Impendulo: Uma isiphethu sicindezelwe, kwenziwa umsebenzi kuso, okugcinwa njengamandla angase abe khona. Lawa mandla angakhishwa uma isiphethu sidedelwa.

16. Umbuzo: Iyini inkolelo-mbono yamandla okusebenza? Impendulo: Ithiyori yamandla okusebenza ithi umsebenzi owenziwa entweni ulingana noshintsho lwamandla ayo e-kinetic.

17. Umbuzo: Amandla ahlobene kanjani nomsebenzi? Impendulo: Amandla yisilinganiso lapho umsebenzi wenziwa khona noma amandla adluliselwa ngaso. Kubalwa ngokuthi $P = W / t$ , lapho $W$ kungumsebenzi futhi $t$ isikhathi.

18. Umbuzo: Ingabe umsebenzi ungaba nenani elibi? Impendulo: Yebo, umsebenzi awubi uma amandla kanye nesiqondiso sokunyakaza kuphambene.

19. Umbuzo: Uma i-engeli ephakathi kwamandla kanye nesiqondiso sokunyakaza ingama-degree angu-90, yimuphi umsebenzi owenziwayo? Impendulo: Umsebenzi owenziwe u-zero ngoba amandla awanaso isakhi esiqondiswe ekunyakazeni.

20. Umbuzo: Umshini olula, njengesibambo, wenza kanjani umsebenzi ube lula? Impendulo: I-lever ayishintshi umsebenzi wonke owenziwe kodwa ishintsha indlela amandla asetshenziswa ngayo, okwenza umsebenzi uphathwe kahle noma usebenze kahle.

Umqondo womsebenzi kanye nesimiso samandla okusebenza ngomshini kuyisisekelo ku-physics futhi kunikeza ukuqonda okuyisisekelo kokuthi amandla adluliselwa futhi aguqulwa kanjani ezinhlelweni ezahlukene.