Mathata a Rarollotsoeng Motsamaong o Mola - Lebelo le sa Feleng
1. Koloi e tsamaea ka lebelo le sa fetoheng la 10 m/s. Fumana sebaka kamora metsotsoana e 10 le metsotsoana e 60.
tharollo
Lebelo le sa fetoheng la limithara tse 10 ka motsotsoana le bolela hore koloi e tsamaea limithara tse 10 motsotsoana o mong le o mong.
Kamora metsotsoana e 2, koloi e tsamaea limithara tse 20,
Kamora metsotsoana e 5, koloi e tsamaea limithara tse 50,
Kamora metsotsoana e 10, koloi e tsamaea limithara tse 100 ,
Kamora metsotsoana e 60, koloi e tsamaea limithara tse 600.
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2. Koloi e tsamaea tseleng e otlolohileng ka lebelo le sa fetoheng la 72 km/h. Fumana sebaka sa koloi kamora metsotso e 2 le metsotso e 5.
tharollo
72 km/h = (72)(limithara tse 1000) / metsotsoana e 3600 = metsotsoana e 72,000 / metsotsoana e 3600 = limithara tse 20/motsotsoana.
Lebelo le sa fetoheng la limithara tse 20 ka motsotsoana le bolela hore koloi e tsamaea limithara tse 20 motsotsoana o mong le o mong.
Kamora metsotsoana e 120 kapa metsotso e 2, koloi e tsamaea limithara tse 20 x 120 = limithara tse 2400 ,
Kamora metsotsoana e 300 kapa metsotso e 5, koloi e tsamaea limithara tse 20 x 300 = limithara tse 6000.
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3. 'Mele o tsamaea tseleng e otlolohileng ka limithara tse 100 ka metsotsoana e 50. Fumana lebelo la 'mele.
tharollo
Limithara tse 100 / metsotsoana e 50 = limithara tse 10 / metsotsoana e 5 = limithara tse 2 ka motsotsoana.
4. Fumana lebelo ho latela setshwantsho se ka tlase….
tharollo
Lebelo = Sebaka / nako e fetile
Lebelo = limithara tse 2 / motsotsoana o le mong = limithara tse 4 / metsotsoana e 2 = limithara tse 6 / metsotsoana e 3 = limithara tse 8 / metsotsoana e 4 = limithara tse 2 ka motsotsoana.
5. Likoloi A le B lia atamelana litseleng tse bapileng. Ha sebaka se pakeng tsa likoloi tse peli e le limithara tse 100, koloi A e tsamaea ka lebelo le sa fetoheng la 10 m/s, koloi B e tsamaea ka lebelo le sa fetoheng la 40 m/s. Fumana (a) sebaka sa koloi A pele u feta koloi B (b) nako e sa fellang pele koloi B e feta koloi A.
tharollo
Koloi A e tsamaya ka lebelo le sa fetoheng la limithara tse 10 ka motsotsoana, ho bolelang hore koloi A e tsamaya ho fihlela limithara tse 10 motsotsoana o mong le o mong. Kamora metsotsoana e 2, koloi e tsamaya ho fihlela limithara tse 20.
Koloi ea B e tsamaea ka lebelo le sa fetoheng la limithara tse 40 ka motsotsoana, ho bolelang hore koloi ea B e tsamaea ho fihlela limithara tse 40 motsotsoana o mong le o mong. Kamora metsotsoana e 2, koloi ea B e tsamaea ho fihlela limithara tse 80.
Limithara tse 20 + limithara tse 80 = limithara tse 100.
(a) Sebaka sa koloi A pele koloi B e feta ke limithara tse 20. Sebaka sa koloi B pele koloi A e feta ke limithara tse 80.
(b) Nako e pakeng tsa koloi B pele e feta koloi A ke metsotsoana e 2. Nako e pakeng tsa koloi A pele e feta koloi B ke metsotsoana e 2
5. Haeba sesupa-tsela sa lebelo sa koloi se bontša 108 km/h, fumana sebaka seo koloi e se tsamaileng ka motsotso o le mong.
Tharollo:
Speedometer ke sesebelisoa sa ho lekanya lebelo. Lebelo la koloi ke 108 km/hora.
108 km / h = (108) (limithara tse 1000) / metsotsoana e 3600 = limithara tse 30 ka motsotsoana.
Motsotso o le 1 = metsotsoana e 60
Lebelo la koloi la limithara tse 30 ka motsotsoana le bolela hore koloi e tsamaea ho fihlela ho limithara tse 30 ka motsotsoana o le mong.
Kamora motsotsoana o le mong, koloi e tsamaya ho fihlela ho 1 x 30 metres = 30 metres.
Kamora metsotsoana e 2, koloi e tsamaya ho fihlela ho 2 x 30 metres = 60 metres.
Kamora metsotsoana e 60, koloi e tsamaya ho fihlela ho 60 x 30 metres = 1800 metres.
6. Tom o lahlela bolo ka ho toba ho Andrew . Tom le Andrew ba arohane ho fihlela ho dimithara tse 10.08 . Bolo e lahlelwa ka ho rapama mme e tsamaya ka lebelo la 20 m/ s (ho hlokomoloha matla a khoheli). Andrew o otla bolo metsotsoana e 4.00 x 10 -3 kamora hore bolo e lahlelwe. Haeba motho ya otlang a tsamaya ka lebelo le sa fetoheng la 5.00 m/s, bolo e otlwa ke motho ya otlang ka mora hore motho ya otlang a tsamaye ho fihlela...
Tse tsejoang:
Sebaka se pakeng tsa Tom le Andrew = limithara tse 10.08
Lebelo la bolo (v) = 20 m/s
Nako e sa fellang (t) = 4 x 10 -3 metsotsoana = 0.004 metsotsoana
Lebelo la moqhobi (v) = 5 m / s
Oa Batla: Bolo e otloa ke motho ea otlang ka mor'a hore bolo e tsamaee ho fihlela…
Tharollo:
Sebaka sa bolo:
s 1 = vt = (20) (0.004) = 0.08 limithara
Sebaka sa sebapali:
s 2 = vt = 5 t
Sebaka sa bolo + sebaka sa motho ea otlang = sebaka se pakeng tsa Tom le Andrew.
0.08 + 5 t = 10.08
5 t = 10.08 – 0.08
5 t = 10
t = 10/5
t = metsotsoana e 2
Sebaka sa sebapali:
s 2 = vt = 5 t = (5) (2) = limithara tse 10
7. Setsomi se nang le koloi ea sona se lelekisa khama. Koloi e tsamaea ka lebelo la 72 km/h 'me khama e matha ka lebelo la 64.8 km/h. Ha sebaka se pakeng tsa koloi le khama e le limithara tse 2012, setsomi se ile sa thunya sethunya sa sona. Lithunya li tsoa ka sethunya ka lebelo la 200 m/s. Fumana nako eo khama e thunngoang ka eona.
A. 0.5 s
B. 1 s
C. 1.25 s
D. 1.5 s
Tse tsejoang:
Lebelo la koloi (v b ) = 72 km/h = (72)(1000 m) / 3600 s = 20 m/s
Lebelo la khama (v r ) = 64.8 km/h = (64.8)(1000 m) / 3600 s = 64800 m / 3600 s = 18 m/s
Ha kulo e thunngoa, sebaka se pakeng tsa koloi le khama = limithara tse 202
Lebelo la mollo (v p ) = 20 m/s + 200 m/s = 220 m/s
Libetsa li tšoaroa ke litsomi tse ka koloing e tsamaeang ka lebelo la 20 m/s e le hore lebelo la koloi le lona le eketsoe lebelong la kulo.
Ho batloa: Fumana nako eo khama e thunngoang ka eona
Tharollo:
Nahana ka likoloi le likhama tse tsamaeang ka lebelo le sa fetoheng.
Tekanyo: v = s / t kapa s = vt
v = lebelo, s = sebaka, t = nako e sa fellang
Sebaka = 202 + X r = 202 + v r t = 202 + 18 t
Sebaka = Y p = v p t = 220 t
Sebaka se tsamauoang ke khama = sebaka se tsamauoang ke kulo
202 + 18 t = 220 t
202 = 220 t – 18 t
202 = 202 t
t = 202/202
t = motsotsoana o le mong
Karabo e nepahetseng ke B.
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- Sebaka le ho falla
- Lebelo le tloaelehileng le lebelo le tloaelehileng
- Lebelo le sa fetoheng
- Ho potlaka kamehla
- Motsamao oa hoetla o lokolohileng
- Motsamao oa ho theoha ha ho oa ka bolokolohi
- Motsamao o yang hodimo le tlase nakong ya ho wa ha mahala
