Rough incline: sliding down (a = g(sin θ − μk cos θ) down incline)

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a = g(sin θ − μk cos θ) down incline

What each symbol means

SymbolWhat it stands for
aAcceleration along plane (m/s²)
gm/s²
θIncline angle
μkKinetic friction

When to use this

Block sliding down rough incline: along plane mg sinθ − fk = ma with fk = μk mg cosθ.