Amandla omshini - izinkinga nezixazululo

Amandla omshini - izinkinga nezixazululo

Umgomo wamandla okusebenza nowokusebenza

1. I-coefficient ye- kinetic friction phakathi kwe-block kanye ne-floor (μ _k ) ingu-0.5. Iyini i- displacement yento/izinto? Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ².

Kwaziwa:

I-coefficient ye-kinetic friction (μ _k ) = 0.5

Isisindo sebhulokhi (m) = 4 kg

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

Isisindo sebhulokhi (w) = mg = (4)(10) = 40 amaNewton

Uma ibhlogo lisendaweni evundlile khona-ke amandla avamile (N) = isisindo (w) = amaNewton angu-40.

Uma ibhlogo lisendaweni evundlile khona-ke amandla avamile (N) = isisindo (w) = amaNewton angu-40.

Ijubane lokuqala (v ₁ ) = 5 m/s

Ijubane lokugcina (v ₂ ) = 0 m/s

Okufunwayo: ukufuduka kwento (d)?

Isixazululo:

Umgomo wamandla okusebenza-okusebenza uthi umsebenzi (W) owenziwa amandla angewona awokugcina ufana noshintsho lwamandla okusebenza entweni. Ushintsho lwamandla okusebenza = amandla okugcina okusebenza - amandla okuqala okusebenza.

Amandla okungqubuzana kwe-kinetic angenye yamandla angewona awokugcina futhi yiwona kuphela amandla angewona awokugcina asebenza ku-block.

W = ΔME

f _k d = ME ₂ – ME ₁

Umsebenzi owenziwe yi-kinetic friction force:

W = f _k d = (μ _k )(N)(d) = (0.5)(40)(d) = 20 d

Ushintsho lwamandla omshini:

ΔME = ME ₂ – ME ₁ = (KE + PE) ₂ – (KE + PE) ₁

Into ihamba ngendiza evundlile futhi akukho shintsho lokuphakama (Δh = 0) ngakho-ke akukho shintsho lwamandla adonsela phansi (ΔPE = PE ₂ – PE ₁ = 0). Ngakho-ke ushintsho lwamandla omshini luhilela nje ushintsho lwamandla okunyakaza.

ΔME = KE ₂ – KE ₁ = ½ mv ₂ ² – ½ mv ₁ ² = ½ m (v ₂ ² – v ₁ ² )

Δ M E = ½ (4) (0 ² – 5 ² ) = (2)(25) = 50

Ukususwa kwebhulokhi:

W = ΔME

Amasekhondi angu-20 = 50

s = 50 / 20

s = amamitha ayi-2.5

Umgomo wokulondolozwa kwamandla omshini

2. Into A kanye nento B zinesisindo esifanayo. Into A iwa ngokukhululeka isuka ekuphakameni kwamamitha angu-h kanti into B iwa ngokukhululeka isuka ekuphakameni kwamamitha angu-2. Uma into A ishaya phansi ku-vm/s, khona-ke iyini amandla e-kinetic ento B uma ishaya phansi.

Isixazululo:

Ijubane lokugcina lento B lapho iwela ngokukhululeka kusuka ekuphakameni kwamahora ama-2:

v ² = 2 g (amahora ama-2) = 4 gh

Amandla e-kinetic ento B:

KUYA ku- _B = ½ mv ² = ½ m (4 gh) = 2 mgh —– isibalo 1

Amandla okuqala omshini ento B = amandla adonsela phansi = mg h.

Amandla okugcina omshini ento B = amandla e-kinetic = ½ mv ².

Umgomo wokonga amandla emishini:

mgh = ½ mv ²

Ngoba i-mgh = ½ mv ² khona-ke singashintsha i-mgh ku-equation 1 ne-½ mv ².

Amandla e-kinetic ento B = 2 mgh = 2(½ mv ² ) = mv ²

3. Ukuwa kwento ngaphandle kokuphakama kwamamitha angu-20. Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s. Iyini ijubane lento engamamitha angu-15 ngaphezu komhlabathi?

Isixazululo:

Amandla okugcina omshini = amandla okuqala omshini

Amandla e-kinetic ephuzwini lesi-2 = ushintsho lwamandla adonsela phansi afinyelela kumamitha ama-5.

4. Ibhulokhi likhishwa phezulu kwendilinga ebushelelezi. Lingakanani ijubane lebhulokhi uma lishaya phansi?

Isixazululo:

Amandla okuqala omshini = amandla adonsela phansi = mgh = m (10)(5) = amamitha angu-50

Amandla okugcina omshini = amandla e-kinetic = 1/2 mv ²

Isimiso sokulondolozwa kwamandla omshini, sithi amandla okuqala omshini = amandla okugcina omshini.

Mina ₌ Mina _t

50 m = 1/2 mv ²

50 = 1/2 v ²

2 (50) = v ²

100 = v ²

v = 10 m/s

5.

Ibhulokhi enesisindo esingu-m-kg ekhishwe ekuphakameni kwamamitha angu-h ngaphezu komhlabathi, njengoba kuboniswe esithombeni esingezansi. Thola isilinganiso samandla angase abe khona kumandla e-kinetic (KE) endaweni ethi M.

Isixazululo:

Amandla adonsela phansi endaweni ethi M:

I-PE _M = mg (amahora angu-0.3)

Amandla e-kinetic endaweni ka-m = ushintsho lwamandla adonsela phansi kuze kufike ku-h-0.3h = 0.7h

KE _M = PE = mg (0.7 h)

Isilinganiso samandla adonsela phansi namandla e-kinetic endaweni ethi M:

PE _M : KE _M

mg (0.3 h): mg (0.7 h)

0.3: 0.7

3: 7

6. Uma i-PE _Q kanye ne-KE _Q zinamandla angase abe khona kanye namandla e-kinetic endaweni ethi Q (g = 10 m/s ² ), khona-ke i-PE _Q : KE _Q =…

Isixazululo:

Amandla adonsela phansi endaweni ethi Q:

PE _Q = mgh = (m)(10)(1.8) = amamitha ayi-18

Amandla e-kinetic ephuzwini Q = ushintsho lwamandla adonsela phansi kuze kufike ku-5-1.8 = amamitha angu-3.2

UKUYA KU- _Q = PE = mgh = m (10)(3.2) = 32 m

Isilinganiso samandla adonsela phansi namandla e-kinetic endaweni ethi Q:

PE _Q : KE _Q

18 m : 32 m

18: 32

9: 16

1. Iyini amandla omshini? Impendulo: Amandla omshini yisamba samandla angase abe khona kanye namandla e-kinetic ohlelweni. Amelela inani eliphelele lamandla ahlobene nokunyakaza kanye nendawo yento.
2. Amandla e-kinetic ahluke kanjani kumandla angase abe khona? Impendulo: Amandla e-kinetic amandla okunyakaza, kuyilapho amandla angase abe amandla agcinwe ngenxa yesikhundla noma ukwakheka kwento. Isibonelo, imoto ehambayo inamandla e-kinetic, kuyilapho isiphethu esiluliwe noma into ephakeme ensimini yamandla adonsela phansi inamandla angase abe khona.
3. Ingabe amandla omshini ahlala elondolozwa? Impendulo: Esimisweni esifanelekile, esivaliwe esingenawo amandla angaphandle, amandla emishini ayalondolozwa. Kodwa-ke, ezimweni zangempela, ezinye izinhlobo zamandla njengamandla okushisa noma omsindo zingaba nomthelela ngenxa yokungqubuzana noma amanye amandla angewona awokugcina, okuholela ekunciphiseni kwamandla emishini aphelele.
4. Ukulondolozwa kwamandla emishini kusiza kanjani ekuxazululeni izinkinga? Impendulo: Uma amandla omshini elondolozwa ohlelweni (akukho mandla angewona awokugcina njengokuxubana), amandla aphelele ekuqaleni alingana namandla aphelele ekugcineni. Lesi simiso sisivumela ukuthi sihlobanise amandla angase abe khona kanye namandla e-kinetic ngezikhathi ezahlukene, okwenza kube lula inqubo yokuxazulula izinkinga.
5. Kwenzekani emandleni ebhola uma liphonswa phezulu bese lima okwesikhashana ngaphambi kokwehla? Impendulo: Njengoba ibhola likhuphuka, amandla alo e-kinetic ayancipha kuyilapho amandla alo angase akhuphuke. Esicongweni, wonke amandla alo okusebenza ngamandla angakhona. Njengoba lehla, le nqubo iyashintsha. Esimweni esihle ngaphandle kokumelana nomoya, amandla aphelele e-mechanical ebhola ahlala engaguquki kulo lonke uhambo lwalo.
6. Ingabe into ingaba namandla e-kinetic kanye namandla angase abe khona ngesikhathi esisodwa? Impendulo: Yebo, into ingaba nezinhlobo zombili zamandla ngesikhathi esisodwa. Isibonelo, i-pendulum ephakathi nendawo yokujika kwayo inamandla okuhamba ngenxa yokunyakaza kwayo kanye namandla angaba khona ngenxa yokuphakama kwayo ngaphezu kwendawo yayo ephansi kakhulu.
7. I-roller coaster ikubonisa kanjani ukongiwa kwamandla omshini? Impendulo: I-roller coaster iqala ngamandla angase abe khona lapho iphezulu kakhulu. Njengoba yehla, la mandla angase abe khona aguquka abe amandla e-kinetic, okwenza i-coaster isheshise. Njengoba ikhuphuka futhi, amandla e-kinetic ayancipha kuyilapho amandla angase abe khona enyuka. Ngaphandle kokunganaki ukungqubuzana nokumelana nomoya, amandla aphelele omshini ahlala cishe engaguquki.
8. Yiziphi izici ezingaholela ekulahlekelweni kwamandla okusebenza kwemishini ezinhlelweni zangempela? Impendulo: Ukungqubuzana, ukumelana nomoya, kanye nokukhiqizwa komsindo kungenye yezinto ezingaholela ekulahlekelweni kwamandla ezinhlelweni zangempela. Amandla awabhujiswa (ngenxa yomthetho wokulondolozwa kwamandla) kodwa aguqulwa abe ezinye izinhlobo ezifana nokushisa noma umsindo.
9. Buyini ubudlelwano phakathi komsebenzi namandla omshini? Impendulo: Umsebenzi owenziwa ohlelweni ngamandla angaphandle ungaholela ekushintsheni kwamandla omshini wesistimu. Ngokwezibalo, umsebenzi ulingana noshintsho lwamandla omshini.

10. Uma amandla adonsela phansi ehlobene nephuzu lokubhekisela, singalinganisa kanjani izinguquko kulo ngokungaguquki? Impendulo : Nakuba inani eliphelele lamandla adonsela phansi lincike ekukhetheni iphuzu lokubhekisela, izinguquko kumandla angase abe khona (njengalapho into iphakanyiswa noma yehliswa) ziyavumelana kungakhathaliseki ukuthi ibhekisela kuphi. Ngakho-ke, sivame ukugxila ezinguqukweni zamandla angase abe khona kunamanani aphelele.