Umsebenzi we-Net Amandla adonsela phansi Amandla e-Kinetic – Izinkinga Nezixazululo

4 Umsebenzi we-Net Amandla adonsela phansi Amandla e-Kinetic - Izinkinga Nezixazululo

1. Into enesisindo esingamakhilogremu angu-5 ukuphakama kwamamitha ayi-10 ngaphezu komhlabathi. Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ^2. Yimuphi umsebenzi owenziwayo entweni ukuze uyinyuse iye phezulu ukuphakama kwamamitha ayi-15 ngaphezu komhlabathi?

Kwaziwa:

Isisindo sento (m) = 5 kg

Ukuphakama (h) = amamitha angu-10

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Okufunwayo: Kwenziwe umsebenzi kule nto ukuze inyuswe iye phezulu ifike endaweni ephakeme ngamamitha ayi-15 ngaphezu komhlabathi.

Isixazululo:

W = F d = wh = mgh

W = umsebenzi, F = amandla, d = ukufuduka , w = isisindo , h = ukuphakama, m = isisindo, g = ukusheshisa ngenxa yamandla adonsela phansi

Umsebenzi owenziwe entweni:

W = mgh = (5 kg)(10 m/s ² )(10 m) = 500 kg m ² /s ² = 500 Joules

2. Into engamakhilogremu amabili ihamba endaweni ebushelelezi evundlile ngesivinini esingu-2 m/s. Uma isivinini sokugcina sento singama-5 m/s. Uyini umsebenzi owenziwe entweni?

Kwaziwa:

Isisindo sento (m) = 2 kg

Ijubane lokuqala (v _o ) = 2 m/s

Ijubane lokugcina (v _t ) = 5 m/s

Okufunwayo: Umsebenzi owenziwe entweni

Isixazululo:

Umgomo wamandla okusebenza-e-kinetic uthi umsebenzi wenethi owenziwe entweni ulingana noshintsho emandleni e-kinetic ento.

W = ΔKE = KE ₂ – KE ₁ = 1/2 mv _t² – 1/2 mv _o² = 1/2 m (v _t² – v _o² ) = 1/2 (2) (5 ² -2 ² ) = (1) (25-4) = 21 Joules

3. Into enesisindo esingu-10-kg ekuqaleni iphumule phansi okubushelelezi. Ngemva kokusunduzwa ngemizuzwana emi-3, into yashesha ngo-2 m/s ² . Uyini umsebenzi owenziwe entweni?

Kwaziwa:

Isisindo (m) = 10 kg

Ijubane lokuqala (v _o ) = 0 (ekuqaleni lapho uphumule)

Isikhawu sesikhathi (t) = imizuzwana eyi-3

Ukusheshisa (a) = 2 m/s ²

Okufunwayo: Umsebenzi (W)

Isixazululo:

Okokuqala, thola ibanga usebenzisa i-equation yokunyakaza kokusheshisa okungaguquki.

d = vot ₊ ½ ku- ² = (0)(3) + ½ (2)(3) ²

d = 0 + (1)(9) = 9

Umsebenzi owenziwe entweni:

W = F s = (ma)(d) = (10)(2)(9) = 180 amaJoules

4. Ibhulokhi enesisindo esingu-1.5 kg esheshiswe phezulu ngamandla angaguquki F = 15 N endizeni ethambekele njengoba kuboniswe esithombeni esingezansi. Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ² futhi akukho ukungqubuzana phakathi kwebhulokhi nendiza ethambekele . Uyini umsebenzi wenethi owenziwe entweni.

Kwaziwa:

Isisindo sebhulokhi (m) = 1.5 kg amandla-adonsela phansi-amandla-amandla-e-kinetic---izinkinga-nezixazululo-1

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Isisindo sebhulokhi (w) = mg = (1.5)(10) = 15 amaNewton

Amandla (F) = 15 Newton

Okufunwayo: Umsebenzi we-inthanethi wenziwa entweni

Isixazululo:

Kunamandla amabili asebenzayo ebhulokini. Okokuqala, amandla ahambisana nokufuduka kwebhulokhi okunguForce F. Okwesibili, ingxenye evundlile yesisindo sebhulokhi (w _x ).

Umsebenzi owenziwe ngenkani (F):

W ₁ = F s = (15 N)(2 m) = 30 N m = 30 Joules

Umsebenzi owenziwe yingxenye evundlile yesisindo (w _x ):

W ₂ = w _x s = (w sin 30 ^o )(2 m) = (15 N)(1/2)(2 m) = 15 N m = 15 Joules

Umsebenzi wenethiwekhi owenziwe entweni:

I-W _inethi = W ₁ – W ₂ = 30 J – 15 J = 15 Joule

Iyini i-theorem yamandla okusebenza ngokwe-net work kanye namandla e-kinetic?
- ImpenduloIthiyori yamandla okusebenza ithi umsebenzi wenethi owenziwe entweni ulingana noshintsho lwamandla ayo e-kinetic. Ngokwezibalo: $W_{n e t} = Δ K E$ .
Uma uphakamisa into uyibeke endaweni ethile bese uyibamba lapho, ungakanani umsebenzi owenzayo entweni ngenkathi uyibambe ingashukumi?
- Impendulo: Ngesikhathi ubambe into ingashukumi, awusebenzi lutho kuyo ngoba akukho ukufuduka. Umsebenzi uchazwa ngokuthi amandla aphindaphinda ukufuduka ngasendleleni yamandla, ngakho-ke ukufuduka akusho ukuthi akukho msebenzi.
Iyini amandla adonsela phansi ento esezingeni lomhlabathi?
- Impendulo: Amandla adonsela phansi ento esezingeni lomhlaba ngokuvamile abhekwa njengo-zero. Amandla adonsela phansi ahlobene, futhi izinga lomhlaba liyindawo evamile yokubhekisela.
Amandla e-kinetic ento ashintsha kanjani uma ijubane layo liphindwe kabili?
- Impendulo: Amandla e-kinetic alingana nesikwele sejubane. Uma ijubane lento liphindwe kabili, amandla ayo e-kinetic azokwanda ngesilinganiso sesine.
Amandla adonsela phansi ento ewayo aphezulu nini?
- Impendulo: Amandla adonsela phansi ento ewayo aphezulu kakhulu ngaphambi nje kokuba iqale ukuwa, okungukuthi, uma isendaweni yayo ephakeme ngaphezu komhlabathi (noma indawo yokubhekisela).
Uma kungekho ukumelana nomoya, yini engashiwo ngobudlelwano phakathi kwamandla angase alahleke kanye namandla e-kinetic atholwa yinto ewa ngokukhululeka?
- Impendulo: Uma kungekho ukumelana nomoya, amandla angaba khona alahleka yinto ewa ngokukhululeka azolingana namandla e-kinetic ayitholayo. Lokhu kungumphumela oqondile wokulondolozwa kwamandla e-mechanical.
Kwenzekani emandleni adonsela phansi ento uma iphakanyiswa kabili ukuphakama kwayo kokuqala ngaphezu komhlabathi?
- Impendulo: Amandla adonsela phansi alingana nokuphakama. Uma into iphakanyiswa kabili ukuphakama kwayo kwasekuqaleni, amandla ayo adonsela phansi azophindeka kabili.
Umsebenzi wenethi wenziwa nini entweni engu-zero?
- Impendulo: Umsebenzi we-net owenziwe entweni u-zero uma umsebenzi ophelele owenziwe yiwo wonke amandla asebenzayo kuyo ufinyelela ku-zero, noma ngokulinganayo, uma kungekho shintsho emandleni e-kinetic ento.
Uma into ihamba ngesivinini esingaguquki, yini engachazwa ngomsebenzi wenethi owenziwe kuyo ebangeni elithile?
- Impendulo: Uma into ihamba ngesivinini esingaguquki, kusho ukuthi akukho ukusheshisa, ngakho-ke akukho mandla asebenzayo kuyo. Ngakho-ke, umsebenzi we-net owenziwe entweni kunoma yiliphi ibanga uzoba yi-zero.
Kungani into esendaweni ephakeme kakhulu inamandla amakhulu adonsela phansi yize ikude kakhulu nesikhungo soMhlaba?
- Impendulo: Amandla adonsela phansi asekelwe endaweni yento maqondana nendawo yokubhekisela (ngokuvamile ubuso boMhlaba) kanye namandla adonsela phansi asebenza kuyo. Into ephakeme kakhulu iphakeme ngaphezu kwale ndawo yokubhekisela, okusho ukuthi ihambe ngokumelene namandla adonsela phansi kuleso sikhundla. Ngenxa yalokho, igcine amandla ngenxa yendawo yayo, futhi la mandla agciniwe angamandla ayo adonsela phansi.