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massa balok(m) = 0.6kg
koef gesek kinetik (u) = 0.1
perpindahan (s) = 4m
tinggi bidang miring = 3m
panjang bidang miring = 4m
percepatan gravitasi (g) = 10m/s^2
ditanya :
usaha ???
jawab:
hipotenusa bidang miring = 5m (ingat tripel pytagoras 3, 4 dan 5)
usaha = F × s
F = m × g × sin sudut
sin sudut = tinggi sisi miring / hipotenusa = 3/5
sehingga
F = m × g × sin sudut
F = 0.6 × 10 × 3/5 = 3.6N
usaha = F × s
usaha = 3.6 × 4 = 14.4 J