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L = 4 m
W = 300 N
Lk = 3,5 m
dit : F dan KM ?
dijawab :
Lb = L - Lk
= 4 - 3,5
= 0,5 m
a. Gaya :
F x Lk = W x Lb
F x 3,5 = 300 x 0,5
F = 150/3,5
F = 42,8 N
b. KM = Lk/Lb
= 3,5/05
= 7
cara lain untuk KM :
KM = W/F
= 300/42,8
= 7,009
= 7
lk = 3,5 m
lb = 4 - 3,5 = 0,5 m
W = 300 N
Asked
F dan KM..?
Answer
W . lb = F . lk
300 . 0,5 = F . 3,5
150 = 3,5F
F = 42,86 N
KM₁ = lk/lb
KM₁ = 3.5/0.5
KM₁ = 7
KM₂ = W/F
KM₂ = 300/42,86
KM₂ = 7
KM₁ = Keuntungan mekanis dengan cara pertama
KM₂ = Keuntungan mekanis dengan cara kedua