Ukusetshenziswa kokulondolozwa kwamandla okusebenza ukuze kuqhutshekwe nokuwa ngokukhululeka - izinkinga nezixazululo

1. Umzimba onesisindo esingu-1 kg uwela ngokukhululeka ekuphumuleni, kusukela ekuphakameni kwamamitha angu-80. Ukusheshisa ngenxa yamandla adonsela phansi kungu- 10 m/s ^2. Iyini amandla e-kinetic lapho umzimba ushaya phansi.

Kwaziwa:

Isisindo (m) = 1 kg

Ukuphakama (h) = 80 m

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

Okufunwayo: amandla e-kinetic lapho umzimba ushaya phansi

Isixazululo:

Amandla okuqala omshini (ME _o ) = amandla adonsela phansi (PE)

M E _o = P E = mgh = (1)(10)(80) = ama-Joules angu-800

Amandla okugcina omshini (M E _t ) = amandla e-kinetic (K E )

Umgomo wokonga amandla emishini :

M E _o = M E _t

P E = K E

800 = K E

Amandla okugcina e-kinetic angama- 800 Joules.

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2. Umzimba onesisindo esingamakhilogremu angu-4 uwela ngokukhululeka ekuphumuleni, kusukela ekuphakameni kwamamitha ayi-10. Ukusheshisa ngenxa yamandla adonsela phansi kungu- 10 ms ^–2 . Iyini amandla e-kinetic kanye nesivinini esingamamitha ama-5 ngaphezu komhlabathi.

Kwaziwa:

Ushintsho lokuphakama (h) = 10 – 5 = 5 amamitha s

Isisindo (m) = 4 kg

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

Okufunwayo: Amandla e-kinetic amamitha ama-5 ngaphezu komhlabathi kanye nesivinini samamitha ama-5 ngaphezu komhlabathi

Isixazululo:

(a) Amandla e-kinetic amamitha ama-5 ngaphezu komhlabathi

Amandla okuqala omshini (M E _o ) = amandla adonsela phansi (P E )

M E _o = P E = mgh = (4)(10)(5) = ama-Joules angu-200

Amandla okugcina omshini (EM _t ) = amandla e-kinetic (EK)

M E _t = K E

Isimiso sokulondolozwa kwamandla omshini sithi amandla okuqala omshini = amandla okugcina omshini.

M E _o = M E _t

200 = K E

Amandla e-kinetic amamitha angu-5 ngaphezu komhlabathi angama- Joules angu-200.

(b) isivinini samamitha ama-5 ngaphezu komhlabathi

Amandla okuqala omshini (M E _o ) = amandla okugcina omshini (M E _t )

P E = K E

200 = ½ mv ²

2(200) / 4 = v ²

100 = v ²

v = √100

v = 10 m/s

Ijubane lomzimba ngamamitha ama-5 ngaphezu komhlabathi liyi-10 m/s.

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3. Umango uwela ngokukhululeka ekuphumuleni, usuka ekuphakameni kwamamitha amabili. Ukusheshisa ngenxa yamandla adonsela phansi kungu- 10 ms ^–2 . Thola ijubane lomango uma ushaya phansi.

Kwaziwa:

Ukuphakama (h) = 2 amamitha s

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

Okufunwayo: ijubane likamango uma lishaya phansi.

Isixazululo:

Amandla okuqala omshini (M E _o ) = amandla adonsela phansi (P E )

ME = PE = mgh = m (10)(2) = 20 m

Amandla okugcina omshini (M E _t ) = amandla okunyakaza (K E )

I - M _Et = KE = ½ mv ²

Isimiso sokulondolozwa kwamandla omshini sithi amandla okuqala omshini = amandla okugcina omshini.

M E _o = M E _t

20 m = ½ mv ²

20 = ½ v ²

2(20) = ^v2

40 = v ²

v = √40 = √(4)(10) = 2√10 m/ s

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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 okusebenza ukuze kushukunyiswe endaweni egobile
10. Ukusetshenziswa kokulondolozwa kwamandla omshini ukuze kushukunyiswe endizeni ethambekele
11. Ukusetshenziswa kokulondolozwa kwamandla okusebenza ngomshini wokunyakaza okubonakalayo