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When a particle accelerates on a slope, Newton’s second law replaces equilibrium along the plane. Resolve perpendicular for the reaction (and friction), then apply F = ma down the slope.
What you'll be able to do
Perpendicular to the slope there is no acceleration, so . Along the slope, the net force gives : e.g. sliding down a rough slope, .
Tip — Friction acts UP the slope when the particle slides down — opposing the motion.
Formula recap
Common mistakes to avoid
Key takeaways
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