Izinto Zamandla E-Kinetic Ekuhambeni Okujikelezayo
Izinto ezihamba emgqeni oqondile zine amandla e-kinetic okungabalwa kusetshenziswa ifomula:
EK = ½ mv2
Imininingwane:
EK = amandla e-kinetic (amayunithi aphesheya angama-kg m2/s2 noma uJoule)
m = isisindo (iyunithi yamazwe ngamazwe ingamakhilogramu, ifinyeziwe ingamakhilogramu)
v = isivinini (iyunithi yamazwe ngamazwe imitha/isekhondi, efingqiwe m/s)
Inani elibonakalayo ekunyakazeni kokujikeleza lifana ne- isisindo (m) kuqhubeke ukunyakaza okuqondile kuyinto umzuzu wokungakhathali (I)Inani elibonakalayo ekunyakazeni kokujikeleza lifana ne- isivinini (v) ekujikelezeni kokujikeleza kuyinto ijubane le-angularNgakho-ke, into ejikelezayo inamandla e-kinetic angabalwa kusetshenziswa ifomula:
Isibonelo sezinkinga
1. Inhlayiya inomzuzu wokungahlali kahle ongu-2 kg m2 ijikeleza ngejubane eliyi-angular elingu-10 rad/s. Thola amandla e-kinetic enhlayiya!
Ingxoxo
2. Inhlayiya enesisindo esingu-1 kg ingama-2 metres ukusuka ku-axis yokujikeleza, ijikeleza ngesivinini se-angle esingu-4 rad/s. Thola amandla e-kinetic enhlayiya!
Ingxoxo
I-Diketahui :
Isisindo sezinhlayiya (m) = 1 kg
Ibanga lezinhlayiya kuya ku-axis yokujikeleza (r) = amamitha ama-2
Ijubane le-angular le-particle = 4 rad/s
Kubuziwe : Iyini amandla e-kinetic (EK) enhlayiya uma ijikeleza?
Jawab :
3. Isilinda esiqinile (I = ½ m R2) enesisindo esingamakhilogremu angu-8 esingashibiliki endaweni eyisicaba ngesivinini esingu-15 m/s. Amandla e-kinetic aphelele esilinda…
Ingxoxo
Kuyaziwa:
Isikhathi sokungahlali kahle kwesilinda esiqinile (I) = ½ MR2
Isisindo sesilinda esiqinile (m) = 8 kg
Ijubane lesilinda (v) = 15 m/s
Kubuziwe: Amandla aphelele e-kinetic esilinda
Impendulo:
Amandla e-kinetic okuhumusha:
EK = ½ mv2 = ½ (8)(152) = (4)(225) = 900 amaJoules
Amandla e-kinetic ajikelezayo:
EK = ½ I ω2 = ½ (½ m R2)(v/R)2 = (¼ m R2)(v2/R2) = ¼ mv2 = ¼ (8)(152) = (2)(225) = 450 amaJoules
Amandla e-kinetic aphelele:
AmaJoules angu-900 + amaJoules angu-450 = amaJoules angu-1350
