Mosebetsi o etsoang ka likhoka - mathata le litharollo

1. Motho o hula boloko bo bolelele ba limithara tse 2 holim'a bokaholimo bo bataletseng ka matla a sa fetoheng F = 20 N. Fumana mosebetsi o entsoeng ka matla F o sebetsang holim'a boloko.

Tse tsejoang:

Matla (F) = 20 N

Sebaka (s) sa ho falla = 2 m

Sekhutlo (θ ) = 0

Ho Batloa : Mosebetsi (W)

Tharollo:

W = F d cos θ = (20)(2)(cos 0) = (20)(2)(1) = 40 Joules

[irp]

2. Matla F = 10 N a sebetsang lebokoseng la 1 m hodima bokaholimo bo otlolohileng. Matla a sebetsa ka sekhutlo sa 30 ^o jwalo ka ha ho bontshitswe setshwantshong se ka tlase. Fumana mosebetsi o etswang ka matla F!

Tse tsejoang :

Matla (F) = 10 N

Matla a rapameng (F _x ) = F cos 30 ^o = (10)(0.5√3) = 5√3 N

Ho falla (d) = mithara e le 1

Ho Batloa : Mosebetsi (W)?

Tharollo :

W = F _x d = (5√3)(1) = 5√3 Li-joule

3. 'Mele o oa ka bolokolohi phomolong, ho tloha bophahamong ba limithara tse 2. Haeba lebelo le bakoang ke matla a khoheli e le 10 m/s ^, fumana mosebetsi o etsoang ke matla a khoheli!

Tse tsejoang:

Boima ba ntho (m) = 1 kg

Bolelele (h) = 2 m

Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s ²

Ho batloa: Mosebetsi o entsoeng ka matla a khoheli (W)

Tharollo:

W = F d = wh = mgh

W = (1)(10)(2) = 20 Joule

W = mosebetsi, F = matla, d = sebaka, w = boima , h = bophahamo, m ​​= boima, g = ho potlaka ka lebaka la matla a khoheli.

[irp]

4. Ntho e boima ba 1-kg e hoketswe sedibeng kahoo e lelefatswa ka 2 cm. Haeba lebelo le bakwang ke matla a kgoheli e le 10 m/s ² , fumana (a) botsitso ba selemo (b) mosebetsi o etswang ke matla a selemo nthong eo

Tse tsejoang:

Boima (m) = 1 kg

Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s ²

Teleletso (x) = 2 cm = 0.02 m

Boima (w) = mg = (1 kg)(10 m/s ² ) = 10 kg m/s ² = 10 N

Ho batloa: Nako e tsitsitseng ea selemo le mosebetsi o etsoang ke matla a selemo

Tharollo:

(a) Sephetho sa selemo

Foromo ea molao oa Hooke :

F = k x.

k = F / x = w / x = mg / x

k = (1)(10) / 0.02 = 10 / 0.02

k = 500 N/m

(b) mosebetsi o etsoang ke matla a selemo

W = – ½ kx ²

W = – ½ (500)(0.02) ²

W = – (250)(0.0004)

W = -0.1 Joule

Letšoao la ho tlosa le bontša hore tataiso ea matla a selemo e fapane le tataiso ea ho falla ha ntho.

[irp]

5. Matla F = 10 N a potlakisa lebokose holim'a ho falla ha 2 m. Fatše le khopame 'me le na le matla a khohlano F _k = 2 N. Fumana mosebetsi oa letlooa o entsoeng lebokoseng.

Tse tsejoang:

Matla (F) = 10 N

Matla a khohlano ea kinetic (F _k ) = 2 N

Ho falla (d) = 2 m

Ho batloa: Marang-rang (W _net )

Tharollo:

Mosebetsi o etsoang ka matla F:

W ₁ = F d cos 0 = (10)(2)(1) = 20 Joule

Mosebetsi o etsoang ka matla a moferefere oa kinetic (F _k ):

W ₂ = F _k d = (2)(2)(cos 180) = (2)(2)(-1) = -4 Dijoule

Marang-rang:

W _letlooa = W ₁ – W ₂

W _letlooa = 20 – 4

W _net = 16 Joule

6. Mosebetsi o etsoang ka matla F bolokong ke ofe?

Tse tsejoang:

Matla (F) = 12 Newton

Ho falla (d) = limithara tse 4

Ho Batloa: Mosebetsi (W)

Tharollo:

W = F d = (12 Newton)(limithara tse 4) = 48 N m = 48 Joule

[irp]

7. Boloko bo sutumelletsoa ke matla a 200 N. Ho falla ha boloko ke limithara tse 2. Mosebetsi o etsoang bolokong ke ofe?

Tse tsejoang:

Matla (F) = 200 Newton

Ho falla (d) = limithara tse 2

Ho Batloa: Mosebetsi (W)

Tharollo:

Mosebetsi:

W = F s

W = (200 Newton)(limithara tse 2)

Bophahamo = 400 N m

W = 400 Joule

8. Mokhanni oa sedan o batla ho paka koloi ea hae hantle 0.5 m ka pel'a teraka e leng 10 m ho tloha moo sedan e leng teng. Mosebetsi o hlokoa ke ofe ke oa sedan?

Tse tsejoang:

Ho falla (d) = limithara tse 10 – limithara tse 0.5 = limithara tse 9.5

Matla (F) = 50 Newton

Ho Batloa: Mosebetsi (W)

Tharollo:

W = F s

W = (50 Newton)(limithara tse 9.5)

Bophahamo = 475 N m

W = 475 Joule

[irp]

9.

Mosebetsi o entsoeng ke Tom le Jerry e le hore koloi e ka tsamaea ho fihlela ho limithara tse 4. Matla a sebelisoang ke Tom le Jerry ke 50 N le 70 N.

Tse tsejoang:

Ho falla (ma) = limithara tse 4

Matla a letlooa (F) = 50 Newtons + 70 Newtons = 120 Newtons

Ho Batloa: Mosebetsi (W)

Tharollo:

W = F s = (120 Newton)(limithara tse 4) = 480 N m = 480 Joule

10. Mokhanni o hula koloi hore koloi e tsamaee ho fihlela ho 1000 cm. Mosebetsi o etsoa koloing ke ofe?

Tse tsejoang:

Matla (F) = 250 Newton

Sebaka (ma) sa ho falla = 1000 cm = 1000/100 metres = 10 metres

Ho Batloa: Mosebetsi (W)

Tharollo:

W = F s = (250 Newton)(limithara tse 10) = 2500 N m = 2500 Joule

11. Ho latela setšoantšo se ka tlase, haeba mosebetsi o etsoang ka matla a letlooa e le 375 Joules, fumana ho falla ha ntho.

Tse tsejoang:

Mosebetsi (W) = 375 Joule

Matla a marang-rang ( ΣF) = 40 N + 10 N – 25 N = 25 Newtons ( ka ho le letona )

Ho Batloa: Ho falla ( d )

Tharollo:

Tekanyo ea mosebetsi:

W = F s

Ho falla ha ntho:

d = W / F = 375 Joule / 25 Newtons

d = limithara tse 15 s

12. Mesebetsi e ka tlase e sa sebetseng ke …

A. Sututsa ntho ho fihlela ho dimithara tse 10

B. Sututsa koloi ho fihlela e tsamaea

C. Sututsa lebota

D. Ke hutse lebokose

Tharollo:

Tekanyo ea mosebetsi:

W = ΣF s

W = mosebetsi , F = matla , d = ho falla

Ho latela foromo e ka holimo, mosebetsi o etsoa ka matla 'me ho na le ho falla.

Karabo e nepahetseng ke C.

1 3. Andrew o sututsa ntho ka matla a 20 N kahoo ntho e tsamaya ka motsamao o chitja ka radius ya dimithara tse 7. Fumana mosebetsi o entsweng ke Andrew bakeng sa motsamao o chitja o makgetlo a mabedi.

A. 0 Joule

B. 1400 Joule

C. 1540 Joule

D. 1760 Joule

Tharollo:

Haeba motho a sututsa setulo sa likooa ka motsamao o chitja habeli, motho eo le setulo sa likooa ba khutlela boemong ba bona ba pele, kahoo ho falla ha motho eo ke lefela.

Ho falla = 0 kahoo mosebetsi = 0.

Karabo e nepahetseng ke A.

14. Motho e mong o sutumelletsa ntho fatše ka matla a 350 N. Fatše le na le matla a khohlano a 70 N. Fumana mosebetsi o etsoang ka matla ho tsamaisa ntho ho fihlela limithara tse 6.

A. 45 J

B. 72 J

C. 1680 J

D. 2580 J

Tse tsejoang:

Matla a ho sututsa (F) = 350 Newtons

Matla a khohlano (F _fric ) = 70 Newtons

Ho falla ha ntho (lintho) = limithara tse 6

Ho Batloa: Mosebetsi (W)

Tharollo:

Ho na le matla a mabeli a sebetsang nthong, matla a sutumetsang (F) le matla a khohlano (F _fric ). Matla a sutumetsang a na le tataiso e tšoanang le ho falla ha ntho hobane matla a sutumetsang a etsa mosebetsi o motle. Ka lehlakoreng le leng, matla a khohlano a na le tataiso e fapaneng le ho falla ha ntho hoo matla a khohlano a etsang mosebetsi o mobe.

Mosebetsi o etsoang ka matla a ho sutumelletsa:

W = F d = (350 Newton)(limithara tse 6) = 2100 Limithara tsa Newton = 2100 Joule

Mosebetsi o etsoang ka matla a khohlano:

W = – (F _fric )(s) = – (70 Newton)(limithara tse 6) = – 420 Newton-meters = – 420 Joule

Marangrang:

W net = 2100 Joule – 420 Joule

W net = 1680 Joule

Karabo e nepahetseng ke C.

15. Ntho e sutumelletsoa ke matla a bataletseng a li-Newton tse 14 mokatong o bataletseng ka matla a khohlano a li-Newton tse 10. Fumana mosebetsi oa letlooa oa ho tsamaisa ntho ho fihlela limithara tse 8.

A. 0.5 Joule

B. 3 Joule

C. 32 Joule

D. 192 Joule

Tse tsejoang:

Matla a sutumetsang (F) = 14 Newton

Matla a khohlano (F _fric ) = 10 Newtons

Ho falla ha ntho (d) = limithara tse 8

Ho Batloa: Mosebetsi (W)

Tharollo:

Ho na le matla a mabeli a sebetsang nthong, matla a sutumetsang (F) le matla a khohlano (F _fric ).

Matla a sututsang a na le tataiso e tšoanang le ho falla ha ntho e le hore matla a sututsang a etse mosebetsi o motle. Ka lehlakoreng le leng, matla a khohlano a na le tataiso e fapaneng le ho falla ha ntho e le hore matla a khohlano a etse mosebetsi o mobe.

Mosebetsi o etsoang ka matla a ho sutumelletsa:

W = F s = (14 Newton)(limithara tse 8) = 112 Limithara tsa Newton = 112 Lijoule

Mosebetsi o etsoang ka matla a khohlano:

W = – (F _fric )(s) = – (10 Newton)(limithara tse 8) = – 80 Limithara tsa Newton = – 80 Lijoule

Marangrang:

W net = 112 Joule – 80 Joule

W net = 32 Joule

Karabo e nepahetseng ke C.

16. Fumana mosebetsi oa netweke ho latela setšoantšo se ka tlase.

A. 360 Joule

B. 450 Joule

C. 600 Joule

D. 750 Joule

Tharollo:

Mosebetsi = Matla (F) x ho falla (d)

Mosebetsi = Sebaka sa khutlotharo 1 + sebaka sa khutlotharo + sebaka sa khutlotharo 2

Work = 1/2(40-0)(3-0) + (40-0)(9-3) + 1/2(40-0)(12-9)

Mosebetsi = 1/2(40)(3) + (40)(6) + 1/2(40)(3)

Mosebetsi = (20)(3) + 240 + (20)(3)

Mosebetsi = 60 + 240 + 60

Mosebetsi = 360 Joule

Karabo e nepahetseng ke A.

17. Sekotwana sa patsi se bolelele ba 60 cm se kentswe mobung ka ho otloloha. Patsi e otlwa ka hamore ya 10-kg ho tloha bophahamong ba 40 cm hodimo ho patsi. Haeba matla a mahareng a khanyetso ya lefatshe e le 2 x 10 3 ^N mme lebelo le bakwang ke matla a kgoheli e le 10 m/s ² , patsi e tla kena mobung ka botlalo kamora ho… otla.

A. 4

B. 16

C. 28

D. 30

Tse tsejoang:

Boima ba hamore (m) = 10 kg

Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/ s ²

Boima ba hamore (w) = mg = (10)(10) = 100 kg m/s ²

Ho tlosa hamore pele e otla patsi (d) = 40 cm = 0.4 metres

Khanyetso ea lehong (F) = 2 x 10 ³ N = 2000 N

Bolelele ba patsi = 60 cm = 0.6 metres

Ho batloa: Patsi e tla kena ka botlalo mobung kamora ho… otla.

Tharollo:

Mosebetsi o entsoeng holim'a hamore ha hamore e tsamaea ho fihlela ho limithara tse 0.4 ke:

W = F d = ws = (100 N)(0.4 m) = 40 Nm = 40 Joule

Mosebetsi o etsoang ke matla a khanyetso a lefats'e:

W = F d = (2000 N)(0.6 m) = 1200 Nm = 1200 Joule

Patsi e tla kena ka botlalo mobung kamora… ho otloa.

Lijoule tse 1200 / Lijoule tse 40 = 30

Karabo e nepahetseng ke D.

[ID ea sephutheloana sa wpdm='1192′]

1. Mosebetsi o etsoang ka mathata a matla le litharollo
2. Mathata le litharollo tsa matla a kinetic a mosebetsi
3. Mathata le litharollo tsa motheo oa matla a sebetsang le a mechini
4. Mathata a matla a khoheli le litharollo
5. Matla a ka bang teng a mathata le ditharollo tsa selemo se tenyetsehang
6. Mathata a motlakase le litharollo
7. Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao oa ho oa ka bolokolohi
8. Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao oa holimo le tlase motsamaong oa ho oa ka bolokolohi
9. Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao holim'a sekhutlo
10. Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao sefofaneng se sekametseng
11. Tšebeliso ea paballo ea matla a mechini bakeng sa motsamao oa liqhomane