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MDCAT Prep · Physics · Quick Reference
Lesson 12 — Mechanics Cheat Sheet
In one line: Four kinematics equations, three Newton's laws, momentum conservation, and work-energy-power tie every mechanics question together.
Key Ideas
1Kinematics. Four equations relate u, v, a, s, t for constant acceleration.
2Newton 1. No net force = no change in motion (inertia).
3Newton 2. F = ma.
4Newton 3. Every action has an equal, opposite reaction.
5Momentum. p = mv, conserved in closed systems; impulse = Ft = Δp.
Formula Sheet
v = u + at
s = ut + ½at²
v² = u² + 2as
s = (u+v)t/2
Work
W = Fs cosθ
Kinetic energy
KE = ½mv²
Potential energy
PE = mgh
Power
P = W/t = Fv