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DINAMIKABidang miring kasar
θ = 37°
μ = 0,2
S = 2,5 m
m = 50 kg
g = 9,8 m/s²
W = ___?
w = m g
N = mg cos θ
f = μ N = μ mg cos θ
usaha
W = ΣF S
W = (mg sin θ - f) S
W = (mg sin θ - μ mg cos θ) S
W = mg (sin θ - μ cos θ) S
W = 50 • 9,8 • (⅗ - 0,2 • ⅘) • 2,5
W = 539 J ✔️