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 (m1) = 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
O botsitse: v1'me v2'
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 (v2') 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 ya 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 thulano (po) = mv
Motsamao oa bolo ka mor'a ho thulana (pt) = m (-v) = – mv
O botsitse: Boholo ba phetoho mokhoeng oa bolo
Karabo:
Phetoho ea lebelo:
Δp = pt - leqo
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 boima bo lekanang lia fetana. A e ea bochabela 'me B e ea bophirima, 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,...
A. VA = V ho ea Bophirima, VB = V ho ea Bochabela
B. VA = 2V ho ea Bophirima, VB = 2V ho ea Bochabela
CVA = 2V ho ea Bophirima, VB = V ho ea Bochabela
D.VA = V ho ea Bophirima, VB = 2V ho ea Bochabela
E.V.A = 2V ho ea Bochabela, VB = V ho ea Bophirima
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
O botsitse: 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 v2' ke lebelo la ntho (2) kamora ho thulana ka ho le letona ka sekhahla sa 5 ms-1, ebe boholo ba lebelo v1 ' (1) kamora hore ho be le 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 (v1) = 8 m/s
Lebelo la ntho 2 pele ho thulano (v2) = 10 m/s
Lebelo la ntho ea 2 ka mor'a ho thulana (v2') = 5 m/s
O botsitse: Lebelo la ntho ea 1 ka mor'a ho thulana (v1')
Karabo:
Ena ke khohlano e sa phethahalang ea elastic.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 ')
v1 + v2 = v1' + v2'
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. Bullet ea 10 gram e tsubeloa ka lebelo la 100 m/s.-1 , e thulana le boloko ba patsi bo sa sisinyeheng mme e dula ka hare ho yona. Haeba boima ba boloko ba patsi bo le digrama tse 490, lebelo la boloko ba patsi le kulo hang ka mora ho thulana ke...
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 (m1) = digrama tse 10
Lebelo la likulo (v)1) = 100 ms-1
Boima ba boloko (m2) = digrama tse 490
Lebelo la boloko (v2) = 0 m/s (boloko ha motho a phomotse)
O botsitse: 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
m1 v1 +m2 v2 = (m1 +m2) 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 tsamaea ka lebelo la 10 m/s-1 e thutsoe ke koloi e tsamaeang ka lebelo la 20 ms-1. Kamora ho thulana, likoloi tse peli li ile tsa thulana. Haeba boima ba teraka e le 1400 kg 'me boima ba koloi e le 600 kg, lebelo la likoloi tse peli 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
O botsitse: lebelo la likoloi ka bobeli kamora ho thulana (v)
Karabo:
Foromo ea ho thulana ha inelastic:
m1 v1 +m2 v2 = (m1 +m2) ho
(1400) (10) + (600) (20) = (1400 + 600) v
26000 = 2000 v
v = 13 m/s
Karabo e nepahetseng ke D.
7 Skulo ea ligrama tse 20 e tsamaea ka lebelo la 10 ms-1 tataiso e otlolohileng e otla boloko bo boima ba digrama tse 60 bo phomotseng fatshe. Haeba kulo e tshwerwe bolokong, jwale lebelo la hona jwale 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 (mP) = digrama tse 20 = 0,02 kg
Boima ba boloko (mB) = digrama tse 60 = 0,06 kg
Lebelo la pele la kulo (v)P) = 10 m/s
Lebelo la pele la boloko (vB= 0
E botsitsoe : lebelo la kulo le thibelo kamora ho thulana (v')
Karabo :
Foromo molao oa paballo ea lebelo haeba lintho tse peli li khomarelana kamora ho thulana:
mP vP +mB vB = (mP +mB) 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 lebelo v.A = 4 ms-1 le vB = 5 ms-1 jwalo ka setshwantshong. Haeba diteroli tse pedi di thulana ka tsela e sa senyeheng, jwale lebelo la diteroli tse pedi kamora ho thulana ke...
A. 4,5 ms-1 Ho ea ka botoneng
B. 4,5 ms-1 Ka ho le letšehali
C. 1,0 ms-1 Ka ho le letšehali
D. 0,5 ms-1 Ka ho le letšehali
E. 0,5 ms-1 Ho ea ka botoneng
Puisano
Hoa tsebahala hore:
Boima ba teroli A (mA) = 1,5 kg
Boima ba teroli B (mB) = 1,5 kg
Lebelo la teroli A pele ho thulano (vA) = 4 m/s (e ntle ka ho le letona)
Lebelo la teroli B pele ho thulano (vB) = -5 m/s (e leng negative ka letsohong le letshehadi)
O botsitse: Haeba ho thulana ho sa thekesele, fumana lebelo la literoli ka bobeli kamora ho thulana.
Karabo:
Molao oa paballo ea matla:
mAvA +mBvB = (mA +mB) 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
