Mehlala e 12 ea Lipotso tsa Khohlano ea Tšusumetso ea Khohlano
1 SKulo ea rabara e bōpehileng joaloka bolo e boima ba ligrama tse 40 e thunngoa ka ho otloloha leboteng joalokaha ho bontšitsoe setšoantšong. Haeba bolo e qhoma ka lebelo le tšoanang, joale phetoho ea lebelo la bolo ke
dalah…
A. 2 Ns
B. 3 Ns
C. 4 Ns
D. 5 Ns
E. 6 Ns
Puisano
Hoa tsebahala hore :
Boima (m) = digrama tse 40 = 0,04 kg
Lebelo la pele (vo o ) = – 50 m/s
Lebelo la ho qetela (v t ) = 50 m/s
Tsela eo bolo e tsamayang ka yona (lebelo) e fapane, ka hona lebelo la pele le lebelo la ho qetela di na le matshwao a fapaneng.
E botsitsoe : phetoho e kae motsamaong oa bolo
Karabo :
Foromo ea phetoho ea lebelo:
Δp = m (v t – vo o ) = (0,04)(50 – (-50)) = (0,04)(50 + 50)
Δp = (0,04)(100) = 4 Ns
Karabo e nepahetseng ke C.
2. Bolo ea rabara ea ligrama tse 75 e lahleloa ka ho rapama ho fihlela e thula lebota joalo ka ha ho bontšitsoe setšoantšong. Haeba bolo ea rabara e khutlela morao ka lebelo le tšoanang, joale boholo ba tšusumetso e hlahang ke...
A. 0
B. 1,5 Ns
C. 3,0 Ns
D. 3,7 Ns
E. 5,5 Ns
Puisano
Hoa tsebahala hore :
Boima ba bolo (m) = digrama tse 75 = 0,075 kg
Lebelo la pele (vo o ) = -20 m/s
Lebelo la ho qetela (v t ) = 20 m/s
Tsela eo bolo e tsamayang ka yona (lebelo) e fapane, ka hona lebelo la pele le lebelo la ho qetela di na le matshwao a fapaneng.
E botsitsoe : tšusumetso
Karabo :
Tšusumetso = phetoho ea lebelo
I = Δp
I = m (v t – vo o ) = 0,075 (20 – (-20)) = 0,075 (20 + 20) = 0,075 (40)
Ke = 3 Ns
Ns e emetse Newton oa bobeli.
Karabo e nepahetseng ke C.
3. Lintho tse peli tse nang le boima bo tšoanang li tsamaea ka mola o otlolohileng ho ea ho o mong joalokaha ho bontšitsoe setšoantšong!
Haeba v 2 'e le lebelo la ntho (2) kamora ho thulana ka ho le letona ka lebelo la 5 ms -1 , joale boholo ba lebelo v 1 ' (1) kamora ho thulana ke…..
A. 7 ms-1
B. 9 ms −1
C. 13 ms −1
D. 15 ms −1
E. 17 ms −1
Puisano
Hoa tsebahala hore:
Boima ba lintho ka bobeli bo lekana = m
Lebelo la ntho 1 pele ho thulano (v 1 ) = 8 m/s
Lebelo la ntho ea 2 pele ho thulano (v 2 ) = 10 m/s
Lebelo la ntho ea 2 kamora ho thulana (v 2 ') = 5 m/s
Potso: Lebelo la ntho 1 kamora ho thulana (v 1 ')
Karabo:
Ena ke khohlano e sa phethahalang ea elastic. v 1 ' e baloa ho sebelisoa molao oa paballo ea momentum:
m 1 v 1 + m 2 v 2 = m 1 v 1 ' + m 2 v 2 '
m (v 1 + v 2 ) = m (v 1 ' + v 2 ')
v 1 + v 2 = v 1 ' + v 2 '
8 + 10 = v 1 ' + 5
18 = v 1 ' + 5
v 1 ' = 18-5
v 1 ' = 13 m/s
Karabo e nepahetseng ke C.
4. Libolo tse peli, e 'ngoe le e 'ngoe e nang le boima ba m 1 = 2 kg le m 2 = 1 kg, li bilike ka mahlakoreng a fapaneng ka lebelo v 1 = 2 m s -1 le v 2 = 4 m s -1 joalo ka ha ho bontšitsoe setšoantšong se latelang. Libolo tse peli lia thulana 'me ka mor'a ho thulana lia khomarelana. Lebelo la libolo tse peli ka mor'a ho thulana ke…
A. 2 ms-1
B. 1,2 ms -1
C. 1 ms -1
D. 0,5 ms -1
E. lefela
Puisano
Hoa tsebahala hore :
Boima ba bolo 1 (m1 ) = 2 kg
Boima ba bolo 2 (m2 ) = 1 kg
Lebelo la bolo 1 pele ho thulana (v 1 ) = 2 m/s
Lebelo la bolo 2 pele ho thulana (v 2 ) = -4 m/s
Lebelo le letle le le lebe hobane tsela eo bolo e tsamayang ka yona e fapane. Matshwao a matle le a mabe a bontsha tsela eo bolo e tsamayang ka yona.
Potso : Lebelo la bolo ka mora ho thulana (v')
Karabo :
Potso ena e mabapi le ho thulana ha inelastic. Ho thulana ha inelastic, molao oa paballo ea matla a kinetic ha o sebetse, 'me ke molao oa paballo ea momentum feela o sebetsang. Lebelo la bolo ka mor'a ho thulana le baloa ho sebelisoa mokhoa oa molao oa paballo ea momentum.
m 1 v 1 + m 2 v 2 = (m 1 + m 2 ) v'
(2)(2) + (1)(-4) = (2 + 1) v'
4 – 4 = (3) v'
0 = (3) v'
v' = 0
Karabo e nepahetseng ke E.
5. Libolo tse peli A le B li na le boima bo tšoanang bo tsamaeang bo lebile ho e 'ngoe ka lebelo la 4 ms -1 le 6 ms -1 ka ho latellana joalo ka ha ho bontšitsoe setšoantšong! Ka bobeli lia thulana ka mokhoa o tenyetsehang, 'me lebelo la ntho B kamora ho thulana ke 4 ms -1 ka lehlakoreng le fapaneng le motsamao oa eona oa pele. Lebelo la bolo A hang kamora ho thulana ke...
A. 2 ms-1
B. 2,5 ms -1
C. 4 ms -1
D. 5 ms -1
E. 6 ms -1
Puisano
Hoa tsebahala hore :
Boima ba bolo A (m A ) = m
Boima ba bolo B (m B ) = m
Lebelo la bolo A pele ho thulano (v A ) = 4 m/s
Lebelo la bolo B pele ho thulano (v B ) = 6 m/s
Lebelo la bolo B kamora ho thulana (v B ') = 4 m/s
Potso : Lebelo la bolo A kamora ho thulana (v A ')
Karabo :
Haeba lintho tse peli tse thulanang ka mokhoa o tenyetsehang li na le boima bo tšoanang, joale ka mor'a ho thulana lintho tse peli li fapanyetsana lebelo.
Lebelo la bolo A pele ho thulano (v A ) = lebelo la bolo B kamora thulano (v B ') = 4 m/s
Lebelo la bolo B pele ho thulano (v B ) = lebelo la bolo A kamora thulano (v A ') = 6 m/s
Haeba bolo A e suthela ka letsohong le letšehali pele ho thulana, joale ka mor'a ho thulana, bolo A e suthela ka letsohong le letona. Ka ho tšoanang, haeba bolo B e suthela ka letsohong le letona pele ho thulana, joale ka mor'a ho thulana, bolo B e suthela ka letsohong le letšehali. Kahoo, ka ho thulana ho tenyetsehang ka ho feletseng, tataiso ea motsamao oa lintho pele le ka mor'a ho thulana e fapane.
Karabo e nepahetseng ke E.
6. Lintho A le B, e 'ngoe le e 'ngoe e nang le boima ba 4 kg le 5 kg, li tsamaea ka mahlakoreng a fapaneng joalo ka ha ho bontšitsoe setšoantšong. Ebe lia thulana 'me ka mor'a ho thulana, lintho tse peli li khutlela morao ka lebelo la A = 4 ms -1 le lebelo la B = 2 ms -1 . Ka hona, lebelo la ntho B pele ho ho thulana ke...
A. 6,0 ms-1
B. 3,0 ms -1
C. 1,6 ms -1
D. 1,2 ms -1
E. 0,4 ms -1
Puisano
Hoa tsebahala hore :
Boima ba ntho A (m A ) = 4 kg
Boima ba ntho B (m B ) = 5 kg
Lebelo la ntho A pele ho thulano (v A ) = 6 m/s
Lebelo la ntho A kamora ho thulana (v A ') = 4 m/s
Lebelo la ntho B kamora ho thulana (v B ') = -2 m/s
Matšoao a matle le a mabe a hlalosa lehlakore le fapaneng la motsamao oa bolo.
Potso : Lebelo la ntho B pele ho thulano (v B )
Karabo :
Mofuta oa khohlano ha o hlalosoe bothateng bona. Leha ho le joalo, ho latela bongata bo tsejoang, ho fihletsoe qeto ea hore bothata bona bo amana le khohlano e tenyetsehang hanyane kapa khohlano e tenyetsehang ka mokhoa o sa phethahalang. Khohlanong e tenyetsehang hanyane, molao oa paballo ea matla a kinetic ha o sebetse; ke molao oa paballo ea momentum feela o sebetsang. Lebelo la ntho B pele ho khohlano le baloa ho sebelisoa molao oa paballo ea momentum.
m A v A + m B v B = m A v A ' + m B v B '
(4)(6) + (5)(-2) = (4)(4) + (5)(v B ')
24 – 10 = 16 + 5(v B ')
14 – 16 = 5 (v B ')
-2 = 5 (v B ')
v B ' = -2/5
v B ' = -0,4
Letšoao le lebe le bolela hore tataiso ea motsamao oa ntho B kamora ho thulana e fapane le tataiso ea ntho pele ho ho thulana.
Karabo e nepahetseng ke E.
7. Bolo ea ligrama tse 200 e theoloa ho tloha bophahamong ba 80 cm ntle le lebelo la pele. Kamora ho otla fatše, bolo e khutlela morao ka lebelo la 1 ms -1 (g = 10 ms -2 ). Boholo ba tšusumetso ho bolo ke…
A. 1,6 Ns
B. 1,5 Ns
C. 1,0 Ns
D. 0,8 Ns
E. 0,6 Ns
Puisano
Hoa tsebahala hore:
Boima ba bolo = 200 grams = 0,2 kg
Bolelele = 80 cm = 0,80 m
Lebelo la bolo pele e otla fatshe = ….
Lebelo la bolo ka mora ho otla fatshe / bolo e a tlola = 1 m/s
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso: Boholo ba tšusumetso (I)
Karabo:
Lebelo la bolo pele e otla fatše
Qala ka ho bala lebelo la bolo pele e fihla fatše, u sebelisa mokhoa oa ho tsamaea oa ho oa ka bolokolohi.
Hoa tsebahala hore:
Bolelele (h) = 80 cm = 0,8 m
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Potso: Lebelo la ho qetela (v t )
Karabo:
v t 2 = 2 gh = 2(10)(0,8) = 2(8) = 16
v t = √ 16 = 4 m/s
Boholo ba tšusumetso (I)
Hoa tsebahala hore:
Boima ba bolo (m) = digrama tse 200 = 0,2 kg
Lebelo la bolo pele e otla fatshe (vo o ) = -4 m/s
Lebelo la bolo ka mora ho otla fatshe / bolo e a tlola (v t ) = 1 m/s
Tsela eo bolo e tsamayang ka yona kapa tsela eo lebelo la yona le tsamayang ka yona e fapane hoo lebelo le leng le leng le leng le leng le leng le leng le le leng le le leng le le leng le le leng le le leng.
E botsitsoe: Tšusumetso (I)
Karabo:
Khopolo-taba ea tšusumetso e bolela hore tšusumetso = phetoho ea lebelo.
I = Δp
Ke = m (v t – vo o )
Ke = (0,2)(1– (-4))
Ke = (0,2)(1 + 4)
Ke = (0,2)(5)
Ke = 1 Ns
Karabo e nepahetseng ke C.
8. Sheba setšoantšo se latelang!
Lintho tse peli tse nang le boima bo lekanang m 1 = m 2 = 0,5 kg li lokolloa ka nako e le 'ngoe ho tloha bophahamong bo tšoanang tseleng e boreleli e kobehileng e nang le radius ea 1/5 meter. Haeba lintho tse peli li thulana ka mokhoa o phethahetseng, joale lebelo la ntho ka 'ngoe ka mor'a ho thulana ke… (g = 10 ms -1 )
A. v'1 = -1 ms-1 ; v'2 = 2 ms-1
B. v' 1 = +1 ms -1 ; v' 2 = -2 ms -1
C. v' 1 = -2 ms -1 ; v' 2 = +2 ms -1
D. v' 1 = -2 ms -1 ; v' 2 = +3 ms -1
E. v' 1 = +3 ms -1 ; v' 2 = -2 ms -1
Puisano
Hoa tsebahala hore:
Boima ba ntho (m) = m 1 = m 2 = 0,5 kg
Bolelele ba pele (h 1 ) = 1/5 mithara
Bolelele ba ho qetela (h 2 ) = 0 (botlaase ba tsela)
Lebelo la pele la ntho (v 1 ) = 0 (qalong ntho e phomotse)
Lebelo la ho qetela la ntho (v 2 ) = …. (lebelo la ntho e ka tlase ho tsela = lebelo la ntho pele ho thulano)
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s
Potso: Lebelo la ntho e 'ngoe le e 'ngoe ka mor'a ho thulana
Karabo:
Lebelo la ntho pele ho thulano
Taba ea pele, bala lebelo la ntho pele ho thulana u sebelisa mokhoa oa molao oa paballo ea matla a mechini . Lebelo la ntho pele ho thulana = lebelo la ntho ha e fihla tlase tseleng = lebelo la ho qetela la ntho.
Matla a pele a mechini = Matla a ho qetela a mechini
Matla a khoheli + Matla a Kinetic = Matla a khoheli + Matla a Kinetic
mgh 1 + 1/2 mv 1 2 = mgh 2 + 1/2 mv 2 2
mgh 1 + 0 = 0 + 1/2 mv 2 2
mgh 1 = 1/2 mv 2 2
gh 1 = 1/2 v 2 2
2 gh 1 = v 2 2
2(10)(1/5) = v 2 2
2(2) = v 2 2
4 = v 2 2
v 2 = √4
v 2 = 2 m/s
Lebelo la ntho e 'ngoe le e 'ngoe pele ho thulana = 2 m//s.
Lebelo la ntho ka mor'a ho thulana
Bala lebelo la lintho ka mor'a ho thulana u sebelisa foromo ea ho thulana e tenyetsehang ka ho phethahetseng.
Ka ho thulana ho tenyetsehang ka ho feletseng, haeba boima ba lintho ka bobeli bo tšoana 'me metsamao ea tsona e le khahlanong, joale ha li thulana, lintho tse peli li fapanyetsana lebelo. Mohlala, pele ho ho thulana, ntho A e tsamaea ka 2 m/s 'me ntho B e tsamaea ka -4 m/s. Kamora ho thulana, ntho A e tsamaea ka 4 m/s 'me ntho B e tsamaea ka -2 m/s. Matšoao a fosahetseng le a matle a bontša hore lintho tse peli li ka mahlakoreng a fapaneng.
Potsong ena, tsela eo motsamao o tsamayang ka yona pele ho thulana e fapane mme lebelo la dintho ka bobedi pele ho thulana ke 2 m/s kahoo lebelo la dintho ka bobedi kamora ho thulana le lona ke 2 m/s, empa matshwao a fapane, e nngwe e ntle mme e nngwe e mpe.
Karabo e nepahetseng ke C.
9. Sheba setšoantšo se latelang!
Ntho A e nang le boima ba 2 kg le ntho B e nang le boima ba 3 kg di lokollwa bohareng ba sedikadikwe sa 1/4 ka nako e le nngwe ntle le lebelo la pele. Dintho ka bobedi di feta hodima bokahodimo bo boreledi bo kobehileng mme di thulana ntlheng ya C ka tsela e tenyetsehang ka ho phethahetseng (g = 10 ms -2 ). Lebelo la dintho A le B hang ka mora ho thulana ke…
A. -2 ms-1 le -2 ms-1
B. -3 ms -1 le 7 ms -1
C. -4 ms -1 le 7 ms -1
D. 4 ms -1 le -3 ms -1
E. 7 ms -1 le 3 ms -1
Puisano
Hoa tsebahala hore:
Boima ba ntho A (m 1 ) = 2 kg
Boima ba ntho B (m2 ) = 3 kg
Bophahamo ba pele (h 1 ) = limithara tse 5
Bolelele ba ho qetela (h 2 ) = 0 (botlaase ba tsela)
Lebelo la pele la ntho (v 1 ) = 0 (qalong ntho e phomotse)
Lebelo la ho qetela la ntho (v 2 ) = …. (lebelo la ntho e ka tlase ho tsela = lebelo la ntho pele ho thulano)
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s
Potso: Lebelo la ntho e 'ngoe le e 'ngoe ka mor'a ho thulana
Karabo:
Lebelo la ntho pele ho thulano
Taba ea pele, bala lebelo la ntho pele e thulana u sebelisa molao oa paballo ea matla a mechini . Lebelo la ntho pele ho thulana = lebelo la ntho ha e fihla tlase tseleng.
Matla a pele a mechini = Matla a ho qetela a mechini
Matla a khoheli a ka bang teng = Matla a kinetic
mgh 1 = 1/2 mv 2 2
gh 1 = 1/2 v 2 2
2 gh 1 = v 2 2
2(10)(5) = v 2 2
100 = v 2 2
v 2 = √100
v 2 = 10 m/s
Lebelo la ntho ka 'ngoe pele ho thulana = 10 m/s. Boima ba ntho ha bo ame lebelo la ho qetela.
Lebelo la ntho ka mor'a ho thulana
Lintho tsena tse peli li na le boima bo fapaneng 'me li tsamaea ka mahlakoreng a fapaneng kahoo lebelo la ntho ka 'ngoe ka mor'a ho thulana le baloa ho sebelisoa equation ena:
Lebelo la ntho ka 'ngoe hang ka mor'a ho thulana:
10. Libolo tse peli ka 'ngoe li na le boima ba m1 = 2 kg le m2 = 1 kg e metha ka lehlakoreng le fapaneng ka lebelo v1 = 2 ms-1 le v2 = 4 ms-1 jwalo ka setshwantshong se latelang. Dibolo tse pedi di a thulana mme kamora ho thulana di a kgomarelana. Kecepatan Libolo tse peli ka mor'a ho thulana ke…
A. 2 ms-1
B. 1,2 ms-1
C. 1 ms-1
D. 0,5 ms-1
E. lefela
Puisano
Hoa tsebahala :
Boima ba bolo 1 (m1) = 2 kg
Boima ba bolo 2 (m2) = 1 kg
Lebelo la bolo 1 pele ho thulano (v1) = 2 m/s
Lebelo la bolo 2 pele ho thulano (v2) = -4 m/s
Lebelo le letle le le lebe hobane tsela eo bolo e tsamayang ka yona e fapane. Matshwao a matle le a mabe a bontsha tsela eo bolo e tsamayang ka yona.
E botsitsoe : Lebelo la bolo kamora ho thulana (v')
Jawab :
Potso ena e amana le ho thulana ha inelastic. Khohlanong e sa fetoheng, molao oa paballo ea matla a kinetic ha o sebetse 'me o sebetsa feela molao oa paballo ea lebeloLebelo la bolo ka mora ho thulana le balwa ho sebediswa foromo ya molao wa paballo ya momentum.
m1 v1 +m2 v2 = (m1 +m2) v'
(2)(2) + (1)(-4) = (2 + 1) v'
4 – 4 = (3) v'
0 = (3) v'
v' = 0
Karabo e nepahetseng ke E.
11. Libolo tse peli A le B li na le boima bo lekanang 'me lia tsamaellana ka lebelo la 4 m/s.-1 le 6 ms-1 joalo ka setšoantšong! Eaba ba babeliho thulana ho phethahetseng ha elastic, 'me lebelo la ntho B kamora ho thulana ke 4 ms-1 ka lehlakoreng le fapaneng le motsamao oa eona oa pele. Lebelo la bolo A hang ka mor'a ho thulana ke…
A. 2 ms-1
B. 2,5 ms-1
C. 4 ms-1
D. 5 ms-1
E. 6 ms-1
Puisano
Hoa tsebahala :
Boima ba bolo A (mA) = m
Boima ba bolo B (mB) = m
Lebelo la bolo A pele ho thulano (v)A) = 4 m/s
Lebelo la bolo B pele ho thulano (vB) = 6 m/s
Lebelo la bolo B kamora ho thulana (vB') = 4 m/s
E botsitsoe : Lebelo la bolo A kamora ho thulana (vA')
Jawab :
Haeba lintho tse peli tse thulanang ka mokhoa o tenyetsehang li na le boima bo tšoanang, joale ka mor'a ho thulana lintho tse peli li tla fapanyetsana boima ba tsona. kecepatan.
Lebelo la bolo A pele ho thulano (v)A) = lebelo la bolo B kamora ho thulana (vB') = 4 m/s
Lebelo la bolo B pele ho thulano (vB) = lebelo la bolo A kamora ho thulana (vA') = 6 m/s
Haeba bolo A e suthela ka letsohong le letšehali pele ho thulana, joale ka mor'a ho thulana, bolo A e suthela ka letsohong le letona. Ka ho tšoanang, haeba bolo B e suthela ka letsohong le letona pele ho thulana, joale ka mor'a ho thulana, bolo B e suthela ka letsohong le letšehali. Kahoo, ka ho thulana ho tenyetsehang ka ho feletseng, tataiso ea motsamao oa lintho pele le ka mor'a ho thulana e fapane.
Karabo e nepahetseng ke E.
12. Lintho A le B, e 'ngoe le e 'ngoe e nang le boima ba 4 kg le 5 kg, li tsamaea ka mahlakoreng a fapaneng joalo ka ha ho bontšitsoe setšoantšong. Tse peli lia thulana 'me ka mor'a ho thulana, lintho tse peli li khutlela morao ka lebelo la A = 4 ms.-1 le lebelo B = 2 ms-1, ebe lebelo la ntho B pele ho thulano ke...
A. 6,0 ms-1
B. 3,0 ms-1
C. 1,6 ms-1
D. 1,2 ms-1
E. 0,4 ms-1
Puisano
Hoa tsebahala :
Boima ba ntho A (mA) = 4 kg
Boima ba ntho B (mB) = 5 kg
Lebelo la ntho A pele ho thulano (vA) = 6 m/s
Lebelo la ntho A kamora ho thulana (vA') = 4 m/s
Lebelo la ntho B kamora ho thulana (vB') = -2 m/s
Matšoao a matle le a mabe a hlalosa lehlakore le fapaneng la motsamao oa bolo.
E botsitsoe : Lebelo la ntho B pele ho thulano (vB)
Jawab :
Mofuta oa khohlano ha o hlalosoe potsong ena. Leha ho le joalo, ho latela bongata bo tsejoang, ho ka fihleloa qeto ea hore potso ena e amana le khohlano e sa tenyetseheng kapa khohlano e sa tenyetseheng hantle. ho thulana ho sa fetoheng Molao oa paballo ea matla a kinetic ha o sebetse 'me ke molao oa paballo ea momentum feela o sebetsang. Lebelo la ntho B pele ho thulana le baloa ho sebelisoa equation ea molao oa paballo ea momentum.
mA vA +mB vB = mA vA' + mB vB'
(4)(6) + (5)(-2) = (4)(4) + (5)(vB')
24 – 10 = 16 + 5(vB')
14 – 16 = 5 (vB')
-2 = 5 (vB')
vB' = -2/5
vB' = -0,4
Letšoao le lebe le bolela hore tataiso ea motsamao oa ntho B kamora ho thulana e fapane le tataiso ea ntho pele ho ho thulana.
Karabo e nepahetseng ke E.
Mohloli oa lipotso:
Lipotso tsa Fisiks tsa Tlhahlobo ea Naha bakeng sa Sekolo se Phahameng sa Thuto e Phahameng/Sekolo se Phahameng sa Mosebetsi
