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Friction is the force resisting relative motion between surfaces. Static friction prevents motion from starting; kinetic friction acts during motion. Friction force = coefficient of friction (μ) × normal force (N). Higher μ means more friction.

Trin-for-trin guide

1. 1F_friction = μ × N (normal force)
2. 2Static friction (max): μₛ × N (before motion starts)
3. 3Kinetic friction: μₖ × N (during sliding, usually μₖ < μₛ)
4. 4Normal force = weight × cos(θ) on an incline at angle θ

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