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Total displacement / total time vs the velocity at a single instant.
Three equations relate u, v, a, s, t under constant acceleration.
Slopes and areas of three graphs tell the full story of motion.
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.
Net work equals change in kinetic energy.
Power = rate of doing work = F · v.
Pressure in a liquid grows linearly with depth: P = hρg.
Submerged body experiences upward force equal to weight of displaced fluid.