Ukusetshenziswa kokulondolozwa kwamandla okusebenza ukuze kuhambisane ngqo ekuweni okukhululekile - izinkinga nezixazululo

1. Umuntu uphonsa itshe elingamakhilogremu angu-1 phezulu ngesivinini esingu-2 m/s ngenkathi emi onqenqemeni lwedwala ukuze itshe liwele phansi kwedwala elingamamitha angu-40 ngaphansi. Iyini amandla e-kinetic etshe elingamamitha ayi-10 ngaphezu komhlabathi? Ukusheshisa ngenxa yamandla adonsela phansi g = 10 m/s ².

Kwaziwa:

Isisindo (m) = 1 kg

Ijubane lokuqala (v _o ) = 2 m/s

Ushintsho lokuphakama = 40 – 10 = amamitha angu-30

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

Kufunwa: amandla e-kinetic etshe ngamamitha ayi-10 ngaphezu komhlabathi

Isixazululo:

Amandla okuqala omshini

Amandla okuqala adonsela phansi (EP) = mgh = (1)(10)(30) = 300 Joules

Amandla okuqala e-kinetic (KE) = ½ mv _o ² = ½ (1)(2) ² = ½ (4) = 2 Joules

Amandla okuqala omshini = amandla okuqala adonsela phansi + amandla okuqala e-kinetic = 300 + 2 = 302 Joules.

Amandla okugcina omshini

Amandla okugcina okusebenza ngomshini = amandla okugcina e-kinetic = amandla okuqala adonsela phansi + amandla okuqala e-kinetic = 300 + 2 = 302 Joules.

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2. Umuntu uphonsa into engu-1 kg phezulu emoyeni ngesivinini sokuqala esingu-10 m/s. Thola (a) amandla adonsela phansi ekuphakameni okuphezulu (b) ukuphakama okuphezulu.

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

Kwaziwa:

Isisindo (m) = 1 kg

Ijubane lokuqala (v _o ) = 10 m/s

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

Okufunwayo : amandla adonsela phansi ekuphakameni okuphezulu kanye nokuphakama okuphezulu

Isixazululo:

(a) amandla adonsela phansi ekuphakameni okuphezulu

Amandla okuqala omshini:

Amandla okuqala omshini (ME) = amandla okuqala omshini (KE) = ½ mv _o ² = ½ (1)(10) ² = ½ (100) = 50 Joules.

Amandla okugcina okusebenza ngomshini:

Amandla okugcina omshini (ME) = amandla adonsela phansi (PE)

Umgomo wokonga amandla emishini:

Amandla okuqala omshini = amandla okugcina omshini

KE = PE

50 = PE

Amandla adonsela phansi angama-Joules angu-50.

(b) Ukuphakama okuphezulu

PE = mgh

50 = (1)(10) h

50 = amahora angu-10

h = 50 / 10 = amamitha angu-5

Ukuphakama okuphezulu kungamamitha ama-5 ngaphezu komhlabathi.

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1. Umsebenzi owenziwa ngezinkinga zamandla nezixazululo
2. Izinkinga zamandla e-kinetic kanye nezixazululo zomsebenzi
3. Izinkinga nezixazululo zesimiso samandla okusebenza-okusebenza ngomshini
4. Izinkinga zamandla adonsela phansi kanye nezixazululo ezingaba khona
5. Amandla angaba khona ezinkinga zentwasahlobo ezinwebekayo nezixazululo
6. Izinkinga zikagesi nezixazululo
7. Ukusetshenziswa kokulondolozwa kwamandla omshini ukuze kuqhutshekwe nokuwa kwamahhala
8. Ukusetshenziswa kokulondolozwa kwamandla omshini wokunyakaza okuphezulu nokwehla ekunyakazeni kokuwa kwamahhala
9. Ukusetshenziswa kokulondolozwa kwamandla omshini ukuze kushukunyiswe ebusweni obugobile
10. Ukusetshenziswa kokulondolozwa kwamandla omshini ukuze kushukunyiswe endizeni ethambekele
11. Ukusetshenziswa kokulondolozwa kwamandla okusebenza ngomshini wokunyakaza okubonakalayo