Monday, January 14, 2013

Impuls Sudut – Penjelasan dan Rumus

Gambar gerak melingkar berubah beraturanGambar 6.8 melukiskan sebuah titik partikel dengan massa m melakukan gerak melingkar berubah beraturan karena pengaruh gaya F. Berdasarkan hukum II Newton:
F = m . a
F = m . α . R
F. R = m . α . R^2
Besaran mR^2 disebut momen inersia atau momen kelembaman dari partikel bermassa m yang
melakukan gerak rotasi dengan jari-jari R, yang diberi lambang I, dan F.R adalah momen gaya F terhadap titik O, sehingga  diperoleh persamaan:

Persamaan dan rumus

Pada gerak melingkar berubah beraturan diperoleh:

Rumus dan Persamaan Impuls Sudut 
Keterangan:
τ . Δt = impuls sudut
I . ωt = momentum sudut pada saat t
I . ω0 = momentum sudut mula-mula
I . ωt – I . ω0 = perubahan momentum sudut

impuls sudut = perubahan momentum sudut


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