Izinto eziwela ngokukhululeka - izinkinga nezixazululo

Izinkinga Ezixazululiwe Ekuhambeni Okuqondile – Izinto eziwa ngokukhululeka

1. Into ewile isuka phezulu eweni. Kubonakala sengathi ishaya phansi ngemuva kwemizuzwana emi-3. Thola ijubane layo ngaphambi nje kokushayisa phansi. Ukusheshisa kwamandla adonsela phansi kungu-10 m/s ² . Unganaki ukumelana kwamanzi.

Kwaziwa:

Ijubane lokuqala (v _o ) = 0 (into eyehlisiwe)

Isikhawu sesikhathi (t) = imizuzwana emi-3

Ukusheshisa kwamandla adonsela phansi (g) = 10 m/s ²

Okufunwayo: Ijubane lokugcina (v _t )

Isixazululo:

Ukusheshisa ngenxa yamandla adonsela phansi ebusweni bomhlaba, ubukhulu bawo bungu-9.8 m/s ² . Ukuze senze izibalo zibe lula, sisebenzisa u-10 m/s ².

10 m/s ² noma 10 m/s / 1 umzuzwana, kusho ukuthi ijubane likhuphuka ngokulandelana ngesikhathi ngo-10 m/s phakathi nomzuzwana ngamunye.

Ngemva komzuzwana owodwa, ijubane lento = 10 m/s

Ngemva kwemizuzwana emi-2, ijubane lento = 20 m/s

Ngemva kwemizuzwana emi-3, ijubane lento = 30 m/s.

Singasebenzisa futhi ama-kinematic equation ukunyakaza ngokusheshisa okungaguquki , njengoba kuboniswe ngezansi.

v _t = vo _o + at

s = vot ₊ ½ ku- ²

v _t ² = v _o ² + 2 njengoba

Ukuwa okukhululekile akunalo ijubane lokuqala (v _o = 0), ngakho-ke i-equation engenhla ingashintshwa njengoba kuboniswe ngezansi:

Isibalo sokunyakaza okuwayo okukhululekile :

v _t = gt ………… 1

h = ½ gt ² ………… 2

v _t ² = 2 gh ………….. 3

v _t = gt

v _t = (10)(3)

v _t = 30 m/s

Ijubane lokugcina lingu-30 m/s

2. Isidumbu siwela ngokukhululeka ekuphumuleni, sisuka ekuphakameni okungamamitha angu-25. Thola (a) Isivinini esishaya ngaso phansi. (b) Isikhathi esithathayo ukufika phansi.

Ukusheshisa ngenxa yamandla adonsela phansi ebusweni boMhlaba kungu-10 m/s ².

Kwaziwa:

Ukuphakama (h) = amamitha angu-5

Ukusheshisa kwamandla adonsela phansi (g) = 10 m/s ²

Kufunwa:

(a) Ijubane lokugcina (v _t )

(b) Isikhawu sesikhathi (t)

Isixazululo:

Isibalo sokuwa kwamahhala:

v _t = gt

h = ½ gt ²

v _t ² = 2 gh

(a) Ijubane lokugcina (v _t )

v _t ² = 2 gh = 2(10)(5) = 100

v _t = 10 m/s

(b) Isikhawu sesikhathi (t)

h = ½ gt ²

5 = ½ (10) t ²

5 = 5 t ²

t ² = 5/5 = 1

t = 1 umzuzwana

3. Ibhola liwile lisuka ekuphakameni. Thola (a) Ukusheshisa (b) Ibanga ngemva kwemizuzwana emi-3 (c) Isikhathi emoyeni uma ijubane lokugcina lingu-20 m/s. Ukusheshisa ngenxa yamandla adonsela phansi = 10 m/s ²

Kwaziwa :

Ukusheshisa kwamandla adonsela phansi (g) = 10 m/s ²

Kufunwa:

(a) Ukusheshisa (a)

(b) Ibanga noma ukuphakama (h) uma isikhathi sidlulile (t) = imizuzwana emi-3

(c) Isikhawu sesikhathi (t) uma v _t = 20 m/s

Isixazululo:

Isibalo sokuwa kwamahhala:

v _t = gt

h = ½ gt ²

v _t ² = 2 gh

(a) Ukusheshisa (a)

Ukusheshisa = ukusheshisa ngenxa yamandla adonsela phansi = 10 m/s ² . Kusho ukwanda kwesivinini ngo-10 m/s ngomzuzwana.

(b) Ibanga noma ukuphakama (h) ngemva kuka-t = imizuzwana emi-3

h = ½ gt ² = ½ (10)(3) ² = (5)(9) = amamitha angu-45

(c) Isikhathi esidlulile (t) uma v _t = 20 m/s

v _t = gt

20 = (10) t

t = 20 / 10 = 2 imizuzwana

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1. Ibanga kanye nokufuduka
2. Isivinini esimaphakathi kanye nesivinini esimaphakathi
3. Ijubane eliqhubekayo
4. Ukusheshisa okuqhubekayo
5. Ukunyakaza kwamahhala kokuwa
6. Ukunyakaza phansi ekwindla yamahhala
7. Ukunyakaza okuphezulu nokwehlayo ekuwa okukhululekile