Ukunyakaza phezulu naphansi ekuweni okukhululekile - izinkinga nezixazululo

Izinkinga Ezixazululiwe Ekunyakazeni Okuqondile – Ukunyakaza Okuphezulu Nokwehla Ekuweni Okukhululekile

1. Umuntu uphonsa ibhola phezulu emoyeni ngesivinini sokuqala esingu-20 m/s. Bala ukuthi liya phezulu kangakanani. Unganaki ukumelana kwamanzi. Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ².

Isixazululo

Sisebenzisa enye yalezi zibalo ze-kinematic ukunyakaza ngokusheshisa okuqhubekayo , njengoba kuboniswe ngezansi.

v _t = vo _o + at

s = vot ₊ ½ ku- ²

v _t ² = v _o ² + 2 njengoba

Kwaziwa:

Sikhetha indlela eya phezulu njengeyakhayo kanye nendlela eya phansi njengeyakhayo.

Ijubane lokuqala (v _o ) = 20 m/s (elihle phezulu)

Ukusheshisa kwamandla adonsela phansi (g) = – 10 m/s ² (ukwehla okungekuhle).

Ijubane lokugcina (v _t ) = 0 (ijubane layo liyi-zero ngesikhashana endaweni ephezulu kakhulu)

Okufunwayo: Ukuphakama okuphezulu (h)

Isixazululo:

v _t ² = v _o ² + 2 gh

0 = (20 ² ) + 2(-10) amahora

0 = 400 – 20 amahora

400 = amahora angu-20

h = 400 / 20 = 40 / 2 = amamitha angu-20

2. Umuntu uphonsa itshe phezulu ngesivinini esingamamitha angu-20 ngomzuzwana ngenkathi emi onqenqemeni lwedwala, ukuze itshe liwele phansi kwedwala elingamamitha ayi-100 ngaphansi.

(a) Kuthatha isikhathi esingakanani ibhola ukufinyelela phansi kwedwala (b) Ijubane lokugcina ngaphambi nje kokuba itshe lishaye phansi. Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ² . Unganaki ukumelana kwamanzi.

Kwaziwa:

Sikhetha indlela eya phezulu njengeyakhayo kanye nendlela eya phansi njengeyakhayo.

Ukuphakama (h) = -100 amamitha (okubi ngoba indawo yokugcina ingaphansi kwesikhundla sokuqala)

Ijubane lokuqala (v _o ) = 20 m/s (elihle phezulu)

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

Kufunwa:

(a) Isikhathi emoyeni noma isikhathi esiphakathi (t)

(b) Ijubane lokugcina (v _t )

Isixazululo:

(a) Isikhawu sesikhathi (t)

Kwaziwa:

Ukuphakama (h) = -100 amamitha (okubi ngoba indawo yokugcina ingaphansi kwesikhundla sokuqala)

Ijubane lokuqala (v _o ) = 20 m/s (elihle phezulu), Ukusheshisa kwamandla adonsela phansi (g) = -10 m/s ² (elibi phansi).

h = vot ₊ ½ gt ²

-100 = (20) t + ½ (-10) t ²

-100 = 20 t – 5 t ²

-5 t ² + 20 t + 100 = 0

Sisebenzisa ifomula ye-quadratic:

(b) Ijubane lokugcina

v _t ² = v _o ² + 2 gh

v _t ² = (20 ² ) + 2 (-10)(-100)

v _t ² = 400 + 2000

v _t ² = 2400

v _t = 49 m/s

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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