Kinetic energy, gravitational PE, elastic PE, work-energy theorem, conservation of energy — the tricky ones that trip everyone up.
📌 Quick Memory Keys
These formulas and keywords appear in EVERY question. Memorize them first.
Mass × velocity squared, halved. Velocity matters MORE — doubling v quadruples Eₖ!
🔑 KEY: v is SQUARED → 2×speed = 4×energyMass × gravity (9.8 m/s²) × height. Linear — double height = double energy.
🔑 KEY: g = 9.8 m/s² alwaysSpring constant × compression squared, halved. x is compression distance.
🔑 KEY: x is SQUARED just like v²Force times displacement. Work done BY a force = change in kinetic energy.
🔑 KEY: W = ΔEₖ (no friction) or W_netEnergy transforms but never disappears. With friction: Ei = Ef + Eth (heat).
🔑 KEY: Lost energy → thermal (heat)Energy "lost" to friction becomes heat. Never truly lost — just transferred.
🔑 KEY: TRANSFER not disappearKeep practicing to master energy concepts!