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m₂ = 3 kg
g = 10 m/s²
T = ..............?
Penyelesaian :
* Mencari percepatan gerak katrol
ΣF = Σma
W₁ - W₂ = (m₁ + m₂) • a
m₁g - m₂g = (m₁ + m₂) • a
(m₁ - m₂) • g = (m₁ + m₂) • a
(5 - 3) • 10 = (5 + 3) • a
2 • 10 = 8a
20 = 8a
a = 20/8
a = 2,5 m/s²
* Mencari tegangan tali
ΣF = Σma
W₁ - T = m₁ • a
m₁ • g - T = m₁ • a
5 • 10 - T = 5 • 2,5
50 - T = 12,5
T = 50 - 12,5
T = 37,5 Newton
Jadi, besar tegangan tali katrol adalah 37,5 Newton