: Gravitational force is a central force, so it exerts no torque (conserving angular momentum) and is conservative (conserving mechanical energy). Incorrect Answer : Linear momentum is
The free-body diagram shows weight (mg down), normal force (⊥ to incline), and kinetic friction (up incline). Newton’s second law gives: mg sinθ – μk mg cosθ = ma → a = g(sinθ – μk cosθ). Acceleration is independent of mass, so the time to reach bottom is unchanged. Common error: assuming heavier blocks slide faster.
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