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Uniform horizontal + free fall vertical = parabolic trajectory.
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.
Total momentum of an isolated system stays constant.
Force × time = change in momentum.
Net work equals change in kinetic energy.
Without dissipative forces, KE + PE stays constant.
For small deformations, stress is proportional to strain.
Longitudinal elasticity — how much a wire stretches under load.