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1/k = 1/200 + 1/300
1/k = (3+2)/600
1/k = 5/600
k = 600/5 = 120 N/m
Hitung perubahan panjang pegas akibat beban 20 kg.
Δx = F/k = 200/120 = 1,67 m
k₁ = 200N/m
k₂ = 300N/m
m = 20kg
g = 10m/s²
Dit:
Δx = ..?
Jawab:
1) F = m . g
F = 20 . 10
= 200N
2) Konstanta Pegas Total (Seri)
1/Ktot = 1/k₁ + 1/k₂
= 1/200 + 1/300
= 3/600 + 2/600
1/Ktot = 5/600
Ktot = 600/5 = 120N/m
3) F = Ktot . Δx
Δx = F/Ktot
= 200/120
= 1,67 m