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Without an external force, motion doesn't change — at rest stays at rest, moving keeps moving.
Acceleration is proportional to force, inversely to mass.
Every action has an equal and opposite reaction — on two different bodies.
Friction before motion is larger than during motion — two different coefficients.
On an incline, weight splits — parallel drives motion, perpendicular gives normal.
Constant-speed circular motion still has centripetal acceleration.