Isimiso somsebenzi namandla Amandla angewona awokugcina Ukunyakaza endizeni ethambekele ekungqubuzaneni - Izinkinga Nezixazululo

2 Isimiso somsebenzi namandla Amandla angewona awokugcina Ukunyakaza endizeni ethambekele ekungqubuzaneni - Izinkinga Nezixazululo

1. Ibhulokhi lishelela phansi endizeni ethambekele ngokungqubuzana. Liyini ijubane lebhulokhi uma ibhulokhi lishaya phansi? I-coefficient ye -kinetic friction ingu-0.4. Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ².

Kwaziwa:

Ukuphakama kokuqala (h)_o= 6m

Ukuphakama kokugcina (h _t ) = 0 m

Isivinini sokuqala (v _o ) = 0 (ibhulokhi ekuqaleni lapho iphumule)

I-coefficient yokungqubuzana kwe-kinetic (μ _k ) = 0.4

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 ms ^-2

cos θ = isichasiselo/hyp = 8/10

Ingxenye eqondile yesisindo = w _y = w cos θ = mg cos θ = m (10)(8/10) = m (10)(4/5) = m (40/5) = 8 m

Amandla ajwayelekile = N = w _y = 8 m

Amandla okungqubuzana kwe-kinetic = f _k = μ _k N = μ _k w _y = (0.4)(8 m) = 3.2 m

Okufunwayo: Isivinini sokugcina (v _t )

Isixazululo:

Isimiso samandla okusebenza-okusebenza sithi umsebenzi owenziwa amandla angewona awokugcina izinto asebenza entweni ulingana noshintsho oluphelele emandleni e-kinetic kanye nalawo angase abe khona.

W_nc = ΔEM

W _nc = ΔEK + ΔEP

W _nc = Umsebenzi owenziwe ngamandla angewona awokugcina, Δ EM = Ushintsho emandleni omshini , Δ EK = Ushintsho emandleni e-kinetic, Δ EP = Ushintsho emandleni angase abe khona.

Ushintsho kumandla e-kinetic :

ΔEK = 1/2 m (v _t ² – v _o ² ) = 1/2 m (v _t ² – 0) = 1/2 mv _t ²

Ushintsho emandleni angase abe khona :

ΔEP = mg (h _t – ho ₎ = m (10)(0-6) = m (10)(-6) = – 60 m

Umsebenzi owenziwe ngamandla okungqubuzana kwe-kinetic:

Ukuphakama _nc = – f _ks = – (3.2 m)(10) = – 32 m

Uphawu lokususa lubonisa ukuthi umsebenzi owenziwe ngamandla okungqubuzana kwe-kinetic kubhlokhi awulungile.

Nquma isivinini sokugcina (v _t ):

W _nc = ΔEK + ΔEP

– 32 m = 1/2 mv _t ² – 60 m

– 32 m = m (1/2 v _t ² – 60)

– 32 = 1/2 v _t ² – 60

– 32 + 60 = 1/2 v _t ²

28 = 1/2 v _t ²

2 (28) = v _t ²

56 = v _t ²

v _t = √4.14

v _t = 2√14 ms ^-1

2.

Ibhulokhi liwela phansi endizeni ethambekele ngokungqubuzana. Isivinini sokugcina sebhulokhi uma sifika phansi singu-10 m/s ² . Uma amandla okungqubuzana engu-2 N futhi ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ² . Kuyini ukuphakama kuka-h?

Kwaziwa:

Isisindo sebhulokhi (m) = 1 kg

Isivinini sokuqala (v _o ) = 0 (ibhulokhi ekuqaleni lapho iphumule)

Isivinini sokugcina (v _t ) = 10 ms ^-1

Ukuphakama kokuqala (h _o ) = h

Ukuphakama kokugcina (h _t ) = 0

Amandla okungqubuzana kwe-kinetic (f _k ) = 2 N

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 ms ^-2

Okufunwayo: Ukuphakama (h)

Isixazululo:

Umsebenzi wenziwa ngamandla okungqubuzana kwe-kinetic:

W _nc = – f _k d = – (2)(15) = – 30

Uphawu lokususa lubonisa ukuthi umsebenzi owenziwe ngamandla okungqubuzana kwe-kinetic kubhlokhi awulungile.

Ushintsho kumandla e-kinetic:

ΔEK = 1/2 m (v _t ² – v _o ² ) = 1/2 (1) (10 ² – 0) = 1/2 (10 ² ) = 1/2 (100) = 50

Ushintsho emandleni angaba khona:

ΔEP = mg (h _t – ho ₎ = (1)(10)(0-h) = (10)(-h) = -10 h

Isibalo sesimiso samandla okusebenza-okusebenza:

W _nc = ΔEK + ΔEP

– 30 = 50 – 10 amahora

Amahora ayi-10 = 50 + 30

Amahora ayi-10 = 80

h = 80/10

h = amamitha angu-8

1. Iyini isimiso somsebenzi namandla?
   • Impendulo: Isimiso somsebenzi-amandla sithi umsebenzi owenziwa entweni ulingana noshintsho lwamandla ayo e-kinetic. Ngokwezibalo, $W=\Delta KE$, lapho $W$ umsebenzi usuqediwe futhi $\Delta KE$ ushintsho lwamandla e-kinetic.
2. Amandla angewona amasiko ahlukile kanjani emandleni alondolozayo?
   • Impendulo: Amandla angewona awokugcina izinto, njengokungqubuzana, aholela ekulahlekelweni kwamandla okusebenza ohlelweni, ngokuvamile ngesimo sokushisa. Ngokuphambene nalokho, amandla okugcina izinto, njengamandla adonsela phansi noma amandla entwasahlobo, awaqedi amandla okusebenza kodwa kunalokho angawaguqula phakathi kwamandla angase abe khona kanye namandla e-kinetic ngaphakathi kohlelo.
3. Ukungqubuzana kuthinta kanjani umsebenzi owenziwa entweni ehamba endizeni ethambekele?
   • Impendulo: Ukungqubuzana kusebenza ngendlela ephambene nokunyakaza kwento. Lokhu kusho ukuthi ukungqubuzana kwenza umsebenzi ongemuhle entweni, kunciphisa amandla ayo e-kinetic noma kwandisa inani lomsebenzi wangaphandle odingekayo ukuze kuyishukumise phezulu.
4. Kungani amandla ento angaguquki ngenxa yamandla angewona awokugcina izinto?
   • Impendulo: Amandla angase ahlotshaniswe namandla okulondoloza, futhi ushintsho lwawo luncike ezikhundleni zokuqala nezokugcina kuphela, hhayi endleleni ethathwe. Amandla angewona awokulondoloza angashintsha amandla e-kinetic ento kodwa awanawo amandla angase ahlotshaniswe nawo.
5. I-engeli yokuthambekela ithinta kanjani ukunyakaza kwento endizeni ethambekele ngokungqubuzana?
   • Impendulo: Uma i-engeli yokuthambekela inkulu, ingxenye enkulu yamandla adonsela phansi asebenza ngokuhambisana nendiza iba nkulu. Lokhu kwenza into ibe nzima ukuyigcina iphumule noma ikhuphuke ngendiza, futhi kube lula ukuyisheshisa phansi ngendiza. Ukungqubuzana kusebenza ukumelana nalokhu kunyakaza, kodwa umphumela wayo uba mkhulu kakhulu njengoba i-engeli ikhula.
6. Kungani izinto zingasheshi ngokungenamkhawulo endizeni ethambekele ngokungqubuzana?
   • Impendulo: Ngenxa yokuba khona kokungqubuzana, njengoba into ihamba, amanye amandla adonsela phansi aguqulwa abe ukushisa. Ekugcineni, amandla adonsela phansi ahambisana nendiza azolinganiswa ngamandla okungqubuzana, futhi into izohamba ngesivinini esingaguquki noma iphumule.
7. Ingabe umsebenzi owenziwe yibutho elingaguquki ungabuyiselwa?
   • Impendulo: Umsebenzi owenziwa amandla angewona awokugcina ugesi uvame ukuguqulwa ube izinhlobo zamandla njengokushisa, ngokuvamile okuyinselele kakhulu ukuwaguqula abe amandla asebenzayo omshini. Ezimweni eziningi ezisebenzayo, la mandla abhekwa “njengolahlekile” ohlelweni.
8. Yini enquma ubukhulu bamandla okungqubuzana endizeni ethambekele?
   • Impendulo: Amandla okungqubuzana endizeni ethambekele anqunywa amandla ajwayelekile (aqondile) kanye ne-coefficient yokungqubuzana phakathi kwezindawo. Anikezwa yi ffriction​=μ×fnormal​, lapho $\mu$ yi-coefficient yokungqubuzana.
9. Kungani amandla angase abe khona echazwa njengo-zero kwezinye izindawo zokubhekisela?
   • Impendulo: Amandla angase abe khona ayisilinganiso esilinganiselwe. Ngokuchaza iphuzu lokubhekisela lapho amandla angase abe khona engu-zero, kunikeza isisekelo esiqhubekayo sokubala izinguquko kumandla angase abe khona ezikhundleni ezahlukene maqondana naleyo referensi.
10. Ukunyakaza kwento ethambekele endaweni ethile kungashintsha kanjani uma kungekho ukungqubuzana?

• Impendulo: Ngaphandle kokungqubuzana, amandla odwa asebenza entweni esendizeni kungaba yingxenye yamandla adonsela phansi ahambisana nokuthambekela. Ngenxa yalokho, into izosheshisa phansi endizeni ngenxa yala mandla kuphela futhi ingafinyeleli ijubane elingaguquki ngaphandle kokuthi isetshenziswe amanye amandla angaphandle.