Mehlala e 8 ea Lipotso tsa ho thulana
Ho thulana ho tenyetsehang ka ho phethahetseng
1. Lintho tse peli A (3 kg) le B (5 kg) li tsamaea ka lehlakoreng le le leng ka lebelo la 8 ms – 1 le 4 ms – 1 ka ho latellana . Haeba ntho A e otla ntho B ka ho tenyetseha ho phethahetseng, joale lebelo la ntho ka 'ngoe ka mor'a ho thulana ke...
A. 3 ms –1 le 7 ms –1
B. 6 ms –1 le 10 ms –1
C. 4,25 ms –1 le 10 ms –1
D. 5,5 ms –1 le 5,5 ms –1
E. 8 ms –1 le 4 ms –1
Puisano
Hoa tsebahala hore:
Boima ba ntho A (m 1 ) = 3 kg
Boima ba ntho B (m2 ) = 5 kg
Lebelo la ntho A (v 1 ) = 8 ms –1
Lebelo la ntho B (v 2 ) = 4 ms –1
Ho thulana ho tenyetsehang ka ho phethahetseng
E botsitsoe: v 1 ' le v 2 '
Karabo:
Haeba lintho tse thulanang ka mokhoa o tenyetsehang li na le boima bo fapaneng 'me lebelo la lintho tse peli ka mor'a ho thulana le sa tsejoe, joale lebelo ka mor'a ho thulana le baloa ho sebelisoa equation e latelang:
Haeba lintho ka bobeli li tsamaea ka lehlakoreng le le leng, lebelo la tsona le tla ba le letle. Haeba lintho ka bobeli li tsamaea ka mahlakoreng a fapaneng, lebelo la ntho e 'ngoe le tla ba le letle 'me lebelo la ntho e 'ngoe le tla ba le letle.
Kahoo lebelo la ntho A (v 1 ') kamora ho thulana ke 3 m/s mme lebelo la ntho B (v 2 ') kamora ho thulana ke 7 m/s.
Karabo e nepahetseng ke A.
2. Bolo e nang le momentum P e otla lebota mme e tlola. Ho thulana ho tenyetseha ka ho phethahetseng mme tsela e otlolohile. Phetoho ya momentum wa bolo ke...
A. lefela
B. p/4
C. p/4
D.P
E. 2P
Puisano
Hoa tsebahala hore:
Boima ba bolo = m
Lebelo la bolo pele ho tšubuhlellano = v
Lebelo la bolo ka mor'a ho otla = -v (bolo e tlola ka letsohong le letšehali)
Motsamao oa bolo pele ho thulana (po o ) = mv
Motsamao oa bolo ka mor'a ho thulana (p t ) = m (-v) = – mv
Potso: Phetoho ea lebelo la bolo e kholo hakae?
Karabo:
Phetoho ea lebelo:
Δp = p t – po
Δp = – mv – mv
Δp = – 2 mv
Δp = -2p
Boholo ba phetoho motsamaong oa bolo ke 2p. Letšoao le fosahetseng le bontša tataiso.
Karabo e nepahetseng ke E.
3. Lintho tse peli A le B tse nang le boima bo tšoanang lia fetana. A e ea Bochabela le B e ea Bophirimela, ka lebelo la V le 2V ka ho latellana. Haeba lintho li thulana ka ho tenyetseha ka ho phethahetseng, joale hang ka mor'a ho thulana hoa...
A. V A = V ho ea Bophirima, V B = V ho ea Bochabela
B. V A = 2V ho ea Bophirima, V B = 2V ho ea Bochabela
C. V A = 2V ho ea Bophirima, V B = V ho ea Bochabela
D. V A = V ho ea Bophirima, V B = 2V ho ea Bochabela
E. V A = 2V ho ea Bochabela, V B = V ho ea Bophirimela
Puisano
Hoa tsebahala hore:
Lintho tsena ka bobeli li na le boima bo lekanang.
A e leba botjhabela ka lebelo la V
B e leba bophirima ka lebelo la 2V
Potso: Lebelo la A le B kamora ho thulana
Karabo:
Haeba boima ba lintho ka bobeli bo tšoana 'me ho thulana ho tenyetseha ka ho feletseng, joale lintho tse peli li fapanyetsana lebelo ka mor'a ho thulana.
Kahoo kamora ho thulana, A e leba bophirima ka lebelo la 2V mme B e leba bochabela ka lebelo la V.
Karabo e nepahetseng ke C.
Ho thulana ho sa Tšoaneng ha Elastic
4. 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.
Ho thulana ha Inelastic
5. Kulo ea ligrama tse 10 e tsamaeang ka lebelo la 100 m/s -1 e otla boloko ba patsi bo sa sisinyeheng 'me e lula ho eona. Haeba boima ba boloko ba patsi e le ligrama tse 490, lebelo la boloko ba patsi le kulo hang ka mor'a hore e thulana ke...
A. 1,0 ms -1
B. 2,0 ms -1
C. 2,5 ms -1
D. 4,0 ms -1
E. 5,0 ms -1
Puisano
Hoa tsebahala hore:
Boima ba kulo (m 1 ) = 10 dikgerama
Lebelo la likulo (v 1 ) = 100 ms -1
Boima ba boloko (m2 ) = digrama tse 490
Lebelo la boloko (v 2 ) = 0 m/s (boloko ha e phomotse)
Potso: Lebelo la boloko ba lepolanka le kulo hang ka mora ho thulana
Karabo:
Kulo e otla boloko bo sa sisinyeheng ba lehong mme e dula ho lona, kahoo ena ke khohlano e sa sisinyeheng. Mokhoa oa khohlano e sa sisinyeheng ke:
Motsamao pele ho thulano = motsamao ka mor'a thulano
m 1 v 1 + m 2 v 2 = (m 1 + m 2 ) v'
(10)(100) + (490)(0) = (10 + 490) v'
1000 + 0 = 500 v'
1000 = 500 v'
v' = 1000 / 500
v' = 2 m/s = 2 ms -1
Karabo e nepahetseng ke B.
6. Teraka e tsamayang ka lebelo la 10 m/ s e thuloa ke koloi e tsamayang ka lebelo la 20 m/ s . Kamora ho thulana, dikoloi tse pedi di thulana. Haeba boima ba teraka e le 1400 kg mme boima ba koloi e le 600 kg, lebelo la dikoloi tse pedi kamora ho thulana ke...
A. 6 ms –1
B. 9 ms –1
C. 11 ms –1
D. 13 ms –1
E. 17 ms –1
Puisano
Kamora ho thulana ha koloi, likoloi tse peli li ile tsa khomarelana, e leng se ileng sa fella ka ho thulana ho sa tsitsang.
Hoa tsebahala hore:
Lebelo la teraka (v 1 ) = 10 m/s
Lebelo la koloi (v 2 ) = 20 m/s
Boima ba teraka (m1 ) = 1400 kg
Boima ba koloi (m2 ) = 600 kg
Potso: lebelo la likoloi ka bobeli kamora ho thulana (v)
Karabo:
Foromo ea ho thulana ha inelastic:
m 1 v 1 + m 2 v 2 = (m 1 + m 2 ) v
(1400) (10) + (600) (20) = (1400 + 600) v
26000 = 2000 v
v = 13 m/s
Karabo e nepahetseng ke D.
7. Kulo ea ligrama tse 20 e tsamaeang ka lebelo la 10 m/s - e le 'ngoe e otla boloko ba ligrama tse 60 bo sa sisinyeheng fatše. Haeba kulo e khomaretsoe ka har'a boloko, joale lebelo la hona joale la boloko ke….
A. 1,0 ms -1
B. 1,5 ms -1
C. 2,0 ms -1
D. 2,5 ms -1
E. 3,0 ms -1
Puisano
Hoa tsebahala hore :
Boima ba kulo (m P ) = digrama tse 20 = 0,02 kg
Boima ba boloko (m B ) = digrama tse 60 = 0,06 kg
Lebelo la pele la kulo (v P ) = 10 m/s
Lebelo la pele la boloko (v B ) = 0
Potso : lebelo la kulo le boloko kamora ho thulana (v')
Karabo :
Foromo ea molao oa paballo ea momentum haeba lintho tse peli li khomarelana kamora ho thulana:
m P v P + m B v B = (m P + m B ) v'
(0,02)(10) + (0,06)(0) = (0,02 + 0,06) v'
0,2 + 0 = 0,08 v'
0,2 = 0,08 v'
v' = 0,2 / 0,08
v' = 2,5 m/s
Karabo e nepahetseng ke D.
8. Literaka tse peli A le B, e 'ngoe le e 'ngoe e le boima ba 1,5 kg, lia tsamaellana ka v A = 4 ms -1 le v B = 5 ms -1 joalo ka ha ho bontšitsoe setšoantšong. Haeba literaka tse peli li thulana ka tsela e sa tenyetseheng, joale lebelo la literaka tse peli kamora ho thulana ke...
A. 4,5 ms-1 Ho ea ka botoneng
B. 4,5 ms -1 ka letsohong le letšehali
C. 1,0 ms -1 ka letsohong le letšehali
D. 0,5 ms -1 ka letsohong le letšehali
E. 0,5 ms -1 ka ho le letona
Puisano
Hoa tsebahala hore:
Boima ba teroli A (m A ) = 1,5 kg
Boima ba teroli B (m B ) = 1,5 kg
Lebelo la teroli A pele ho thulano (v A ) = 4 m/s (e ntle ka ho le letona)
Lebelo la teroli B pele ho thulano (v B ) = -5 m/s (hasi ka letsohong le letšehali)
Potso: Haeba ho thulana ho sa thekesele, fumana lebelo la literoli tse peli kamora ho thulana.
Karabo:
Molao oa paballo ea matla:
m A v A + m B v B = (m A + m B ) v'
(1,5)(4) + (1,5)(-5) = (1,5 + 1,5) v'
6 – 7,5 = (3) v'
-1,5 = (3) v'
v' = -1,5 / 3
v' = -0,5 m/s
Letšoao le lebe le bolela hore ka mor'a ho thulana ka bobeli li ea ka letsohong le letšehali, ka lehlakoreng le le leng le teroli ea B. Sena sea utloahala hobane lebelo la teroli ea B le leholo ho feta lebelo la teroli ea A.
Mohloli oa lipotso:
Lipotso tsa Fisiks tsa Tlhahlobo ea Naha bakeng sa Sekolo se Phahameng sa Thuto e Phahameng/Sekolo se Phahameng sa Mosebetsi
