Mehlala e 8 ea Lipotso tsa Linear Momentum
1. Ntho e boima ba 1 kg e tsamaya ka lebelo la 10 m/s. Momentum ntho ke…
Puisano
Hoa tsebahala :
Boima (m) = 1 kg
Lebelo (v) = 10 m/s
E botsitsoe : lebelo le otlolohileng (p)
Jawab :
Foromo ea lebelo: p = mv
Tlhaloso: p = momentum, m = boima, v = kecepatan.
Motsamao oa ntho ke:
p = mv = (1)(10) = 10 kg m/s2
2. Lintho tse peli, e 'ngoe le e 'ngoe e nang le boima ba 2 kg le 4 kg, li tsamaea ka lebelo la 20 m/s. Motsamao oa ntho ka 'ngoe ke…
Puisano
Hoa tsebahala :
Boima ba ntho A (mA) = 2 kg
Boima ba ntho B (mB) = 4 kg
Lebelo la ntho A (v)A) = 20 m/s
Lebelo la ntho B (v)B) = 20 m/s
E botsitsoe : lebelo la ntho A (pA) le lebelo la ntho B (pB)
Jawab :
Matla a ntho A :
pA = mA vA = (2)(20) = 40 kg m/s
Matla a ntho B :
pB = mB vB = (4)(20) = 80 kg m/s
Haeba lebelo la lintho ka bobeli le tšoana, ntho e nang le boima bo boholo e na le matla a maholo.
3. Lintho A le B ka 'ngoe li na le boima ba 2 kg. Ntho A e tsamaea ka lebelo la 2 m/s 'me ntho B e tsamaea ka lebelo la 4 m/s. Motsamao oa ntho A le ntho B ke…
Puisano
Hoa tsebahala :
Boima ba ntho A (mA) = 2 kg
Boima ba ntho B (mB) = 2 kg
Lebelo la ntho A (v)A) = 2 m/s
Lebelo la ntho B (v)B) = 4 m/s
E botsitsoe : lebelo la ntho A (pA) le lebelo la ntho B (pB)
Jawab :
Matla a ntho A :
pA = mA vA = (2)(2) = 4 kg m/s
Matla a ntho B :
pB = mB vB = (2)(4) = 8 kg m/s
Haeba boima ba lintho ka bobeli bo tšoana, ntho e nang le lebelo le leholo e na le lebelo le leholo.
4. Ntho e boima ba 5 kg e phomotse. Motsamao wa ntho ke…
Puisano
Hoa tsebahala :
Boima ba ntho (m) = 5 kg
Lebelo la ntho (v) = 0
E botsitsoe : lebelo la ntho (p)
Jawab :
p = mv = (5)(0) = 0
Haeba ntho e phomotse, ho sa tsotelehe hore na boima ba ntho bo boholo hakae, lebelo la ntho ke lefela.
5. Papaling ea baseball, bolo e boima ba 0,5 kg qalong e tsamaea ka lebelo la 2 ms -1 . Ebe bolo e otloa ka matla F a fapaneng le motsamao oa bolo, e le hore lebelo la bolo le fetohe ho 6 ms -1 . Haeba bolo e kopana le bat ka metsotsoana e 0,01, joale phetoho ea motsamao ke ...
A. 8 kg ms -1
B. 6 kg ms -1
C. 5 kg ms -1
D. 4 kg ms -1
E. 2 kg ms -1
Puisano
Hoa tsebahala hore:
Boima ba bolo (m) = 0,5 kg
Lebelo la pele (vo o ) = 2 m/s
Lebelo la ho qetela (v t ) = -6 m/s
Nako ea ho arohana (t) = metsotsoana e 0,01
E botsitsoe: Phetoho ea lebelo
Karabo:
Foromo ea phetoho ea lebelo:
∆ p = mv t – mv o = m (v t – v o )
∆ p = (0,5 kg)(- 6 m/s – 2 m/s)
∆ p = (0,5 kg)(-8)
∆ p = 4 kg m/s
Karabo e nepahetseng ke D.
6. Ntho e boima ba digrama tse 100 e tsamaya ka lebelo la 5 ms -1 . Ho emisa ntho eo, matla a hanyetsang F a sebetsa ka 0,2 s. Boholo ba matla F ke...
A. 0,5 N
B. 1,0 N
C. 2,5 N
D. 10 N
E. 25 N
Puisano
Hoa tsebahala hore:
Boima ba ntho (m) = 100 grams = 100/1000 = 0,1 kg
Lebelo la pele la ntho (vo o ) = 5 m/s
Lebelo la ho qetela la ntho (v t ) = 0
Nako ea ho thulana (Δt) = metsotsoana e 0,2
Potso: Boholo ba matla F
Karabo:
Khopolo-taba ea tšusumetso e bolela hore tšusumetso e lekana le phetoho ea ts'ebetso.
I = ΔP
F (Δt) = m (v t – vo o )
F (0,2) = 0,1 (0 – 5)
F (0,2) = -0,5
F = -0,5 / 0,2
F = -2,5N
Boholo ba matla ke di-Newton tse 2,5. Letshwao le lebe le bontsha tataiso ya matla. Letshwao le lebe la Gaa le bontsha hore matla a lebisitswe ho fapana le motsamao wa ntho.
Karabo e nepahetseng ke C.
7. Bolo ea tenese e boima ba ligrama tse 100 e theoleloa fatše ho tloha bophahamong ba 20 cm ntle le lebelo la pele. Kamora ho otla fatše, bolo e tlola ka lebelo la 1 ms -1 le (g = 10 ms -2 ). Phetoho ea lebelo leo bolo e le utloang ke...
A. 0,1 Ns
B. 0,3 Ns
C. 0,5 Ns
D. 0,8 Ns
E. 0,9 Ns
Puisano
Hoa tsebahala hore :
Boima ba bolo (m) = digrama tse 100 = 0,1 kg
Bolelele (h) = 20 cm = 0,2 metres
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2
Lebelo la bolo hang ka mora ho otla fatshe (v t ) = 1 m/s
E botsitsoe : phetoho mokhoeng oa bolo
Karabo :
Lebelo la bolo pele ho thulano (v)o)
Bala lebelo la bolo pele ho tshusumetso o sebedisa foromo ya motsamao wa ho wa ka bolokolohi. Ka lebaka la bophahamo ba bolo ya ho wa ka bolokolohi (h) = 0,2 metres, ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s 2 le lebelo la bolo ha e fihla fatshe ho a botswa, ka hona foromo ya v 2 = 2 gh e a sebediswa.
v 2 = 2 (10)(0,2) = 4
v = √4 = -2 m/s
E fuoa lets'oao le lebe hobane tsela eo bolo e tsamaeang ka eona pele e thulana le fatše e fapane le tsela eo bolo e tsamaeang ka eona kamora ho thulana le fatše.
Phetoho motsamaong oa bolo (Δp)
Δp = mv t – mv o = m (v t – v o )
Δp = (0,1)(1 – (-2)) = (0,1)(1 + 2) = (0,1)(3) = 0,3 Motsotswana wa Newton
Karabo e nepahetseng ke B.
8. Ntho e neng e phomotse qalong e ile ea phatloha likarolo tse peli ka karolelano ea 3:2. Karolo e nang le boima bo boholo e ile ea lahleloa ka lebelo la 20 ms -1 . Kahoo lebelo leo karolo e nyane e ileng ea lahleloa ka lona ke...
A. 13,3 ms –1
B. 20 ms –1
C. 30 ms –1
D. 40 ms –1
E. 60 ms –1
Puisano
Hoa tsebahala hore:
Boima ba ntho 1 pele ho thulana = m
Lebelo la ntho 1 pele ho thulano = 0 (ntho e phomotse)
Boima ba karolo ea 1 kamora ho thulana (m1 ) = 3m
Boima ba karolo ea 2 kamora ho thulana (m2 ) = 2m
Lebelo la karolo ea 1 kamora ho thulana (v 1 ') = 20 m/s
Potso: Lebelo la karolo ea 2 kamora ho thulana (v 2 ')
Karabo:
Foromo ea molao oa paballo ea momentum:
m 1 v 1 = m 1 v 1 ' + m 2 v 2 '
(m)(0) = (3m)(20) + (2m) v 2 '
0 = 60m + (2m) v 2 '
60m = -2m v 2 '
60 = -2 v 2 '
v 2 ' = -60/2
v 2 ' = -30 m/s
Letšoao le lebe le bontša hore tsela eo karolo ea 2 e tsamaeang ka eona e fapane le tsela eo karolo ea 1 e tsamaeang ka eona. Mohlala, haeba karolo ea 1 e lahleloa ka bochabela, joale karolo ea 2 e lahleloa ka bophirimela.
Karabo e nepahetseng ke C.
Mohloli oa lipotso:
Lipotso tsa Fisiks tsa Tlhahlobo ea Naha bakeng sa Sekolo se Phahameng sa Thuto e Phahameng/Sekolo se Phahameng sa Mosebetsi
