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Physics · 140–209 · 19 concepts

High School Physics

Reasoning-first High School physics: 19 concepts, each with a clear explanation, a fully worked example, and self-check questions.

Practice at this level — free

Mechanics

Kinematics (1D & 2D motion, projectiles)Newton's laws of motionForces & free-body diagramsFrictionWork, energy & powerConservation of energyMomentum & impulseCollisionsUniform circular motionUniversal gravitation

Waves & oscillations

Simple harmonic motionMechanical waves & soundElectromagnetic wavesGeometric optics (reflection & refraction)

Electricity & magnetism

Electric charge & electric fieldsElectric potential & currentDC circuits (Ohm's law, series & parallel)Magnetism & electromagnetic induction

Thermodynamics

Thermodynamics (intro)