30 multiple-choice questions covering all 5 topics of Unit 3 — kinetic energy, work, potential energy, conservation of energy, and power. Use g = 10 m/s².
Try energy methods first. If a problem involves changing heights, springs, or asks for final speed, energy is almost always faster than F = ma.
Always identify which forces are conservative. If only gravity and springs act, mechanical energy is conserved. If friction is in the picture, you need to add an energy-dissipation term.
Pick the smartest zero of PE. Usually the lowest point in the problem. That way all your PE values are positive — easier to keep track of.
Watch for the v² in KE. Doubling speed quadruples KE — a common trap on conceptual questions.