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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.
For small deformations, stress is proportional to strain.
Object released from rest falls with acceleration g — height vs time.
Total momentum of an isolated system stays constant.
Force × time = change in momentum.
Friction before motion is larger than during motion — two different coefficients.