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mk = 1 kg
R = 20 cm = 0,2 m
mb = 2 kg
g = 10 N/kg
penyelesaian:
a.) Percepatan sistem
Tinjau Beban
w - T = mb a
T = w - mb a
T = mb g - mb a
Tinjau katrol
τ = mk α
T R = mk a / R
T = mk a / R²
Masukan kedua rumus
T = mb g - mb a
mk a / R² = mb g - mb a => pakai rumus ini
Masukan angka
1 . a / 0,2² = 2 . 10 - 2 . a
a / 0,04 = 20 - 2a
a = 0,04 (20 - 2a)
a = 0,8 - 0,08a
a + 0,08a = 0,8
1,08a = 0,8
a = 0,8 / 1,08
a = 0,7 m/s²
b.) Tegangan tali
T = mb g - mb a
T = 2 . 10 - 2 . 0,7
T = 20 - 1,4
T = 18,6 Newton