Foromo ea Mosebetsi le Khopolo-taba ea Matla a Kinetic a Mosebetsi

Mehlala ea lipotso le mekhoa ea mosebetsi le khopolo-taba ea matla a kinetic a mosebetsi

Khoebo

1. Setloholo se sututsa setulo sa maotwana sa nkgono wa sona serapeng sa boikhathollo se chitja ka matla a 20 N, radius ya serapa ke 7 m, setloholo se etsa mosebetsi o mokae bakeng sa ho potoloha ha 2?

1. 0 joule
2. 1400 joule
3. 1540 joule
4. 1760 joule

Puisano
Foromo ea Khoebo: Mosebetsi = Matla x Ho falla
Haeba setloholo se sututsa setulo sa likooa habeli, setloholo le setulo sa likooa ba tla khutlela maemong a bona a pele. Kaha ho khutlela maemong a bona a pele ke lefela, ho falla ha sona ke lefela.
Kahoo boiteko bo entsoeng ke setloholo ke lefela.
Karabo e nepahetseng ke A.

2. Mohlokomedi o sutumelletsa khabote fatshe ka matla a 350 N. Fatše le na le matla a khohlano a 70 N. Mosebetsi o etsoang ho tsamaisa khabote ka limithara tse 6 ke:

1. Ka 45 J
2. Ka 72 J
3. Ka 1680 J
4. Ka 2580 J

Puisano
Hoa tsebahala hore:
Matla a ho sututsa (F) = 350 Newton
Matla a khohlano (F)_swaepa) = 70 Newton
Ho falla ha khabote (lik'habote) = limithara tse 6
O botsitse: Khoebo (Bohareng)
Karabo:
Ho na le matla a mabeli a sebetsang nthong, e leng matla a sututsang (F) le matla a khohlano (F)._swaepa).
Matla a sututsang a ka lehlakoreng le le leng le ho falla ha khabote, kahoo matla a sututsang a etsa mosebetsi o motle. Ka lehlakoreng le leng, matla a khohlano a ka lehlakoreng le fapaneng le ho falla ha khabote, kahoo matla a khohlano a etsa mosebetsi o mobe.
Mosebetsi o etsoang ke matla a sutumetsang:
W = F s = (350 Newton)(limithara tse 6) = 2100 Limithara tsa Newton = 2100 Joule
Mosebetsi o etsoang ka matla a khohlano:
W = – (F_swaepa)(s) = – (70 Newton)(limithara tse 6) = – 420 Limithara tsa Newton = – 420 Lijoule
Boiteko bohle:
Kakaretso ea W = 2100 Joule – 420 Joule
Kakaretso ea W = 1680 Joule
Karabo e nepahetseng ke C.

Khopolo-taba ea matla a kinetic a mosebetsi

3. Matla a sa fetoheng a 8 N a sebetsa nthong e boima ba 16 kg. Haeba ntho eo e phomotse qalong, lebelo la ntho eo ka mora hore matla a sebetse metsotsoana e 4 ke….

1. 0,5 limithara / s
2. 2 limithara / s
3. 4 limithara / s
4. 8 limithara / s

Puisano
Hoa tsebahala hore:
Matla a sa fetoheng (F) = 8 Newton
Boima ba ntho (m) = 16 kg
Lebelo la pele la ntho (v)_o) = 0 m/s
Nako eo matla a sebetsang ho ntho (t) = metsotsoana e 4
O botsitse: Lebelo la ho qetela la ntho (v_t)
Karabo:
Mosebetsi = Phetoho ea matla a kinetic
W = EK ea ho qetela - EK ea pele
W = ½ mv_t² – ½ mv_o²
W = ½ mv_t² - 0
W = ½ mv_t² —— Tekanyo ea 1

Mosebetsi = Matla x Ho falla
W = F s
W = 8 s
Sebelisa foromo ea GLBB ho bala displacement(s)
s = v_o t + ½ ho²
Tlhaloso: s = ho falla, v_o = lebelo la pele, t = nako, a = ho potlaka
s = 0 + ½ ho² = ½ ho² —-> a = (v_t - v_o) / t = v_t
s = ½ (v_t / t) t²
s = ½ (v_t) t
Nka sebaka sa displacement (s) ho equation ya mosebetsi ka displacement (s) ho equation ena:
W = 8 s
W = 8(1/2)(v_t(t)
W = (4)(v_t)(t) —— Tekanyo ea 2

Tekanyo ea 1 = Tekanyo ea 2
W = W
½ mv_t² = (4)(v_t(t)
½ mv_t = (4)(t)
½ (16)(v)_t) = 4(4)
8 v_t = 16
v_t = 16/8
v_t = limithara tse 2/motsotsoana
Karabo e nepahetseng ke B.

4. Ho eketsa lebelo la ntho ho fihlela lebelo la yona la pele le imenne habeli, boiteko ba...

1. Matla a kinetic a eona a pele a makhetlo a mararo
2. Matla a kinetic a eona a pele a makhetlo a mararo
3. Matla a kinetic a eona a pele a makhetlo a mararo
4. Matla a kinetic a eona a pele a makhetlo a mararo

Puisano
Hoa tsebahala hore:
A re re boima ba ntho (m) = 1 kg
A re re lebelo la pele (v)_o) = 1 m/s
Lebelo la ho qetela (v)_t) = 2 x lebelo la pele = 2 x 1 = 2 m/s
O botsitse: Boiteko = … ?
Karabo:
Matla a kinetic a pele:
EK ea pele = ½ mv_o² = ½ (1)(1)² = ½ (1)(1) = ½ (1) = 0,5
Matla a ho qetela a kinetic ha lebelo la ntho le imenne habeli lebelo la pele:
EK ea ho qetela = ½ mv_t² = ½ (1)(2)² = ½ (4) = 2

Khopolo-taba ea matla a kinetic a mosebetsi:
Mosebetsi = Phetoho ea matla a kinetic
Mosebetsi = Matla a ho qetela a kinetic – Matla a pele a kinetic
Boiteko = 2 – 0,5
Boiteko = 1,5

Matla a kinetic a pele = 0,5
Boiteko = 3 x 0,5 = 1,5
Kahoo ho eketsa lebelo la ntho ho fihlela lebelo la eona la pele le imena habeli ho hloka mosebetsi o mongata. Matla a kinetic a eona a pele a makhetlo a mararo.
Karabo e nepahetseng ke B.

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