Physics

Impulse, Elastic vs. Inelastic Collisions, and Momentum in Two Dimensions — A TLDR Primer

Molecules, Maxwell-Boltzmann, and the Ideal Gas Law — A TLDR Primer

Mass-Weighted Averages, the Subtraction Trick, and How the Center of Mass Moves — A TLDR Primer

Entropy, Microstates, and Gibbs Free Energy — A TLDR Primer

Spring Constant, Elastic Potential Energy, and Where Hooke's Law Breaks — A TLDR Primer

Δx·Δp ≥ ℏ/2 and What It Really Means — A TLDR Primer

Superposition, the Measurement Problem, and the Cat That Was Never Really About Cats — A TLDR Primer

Inertia, F = ma, and Why Action-Reaction Forces Never Cancel — A TLDR Primer

Voltage, Current, and Resistance in Every Circuit — A TLDR Primer

Position, Velocity, Acceleration, and the Four Kinematic Equations — A TLDR Primer

Projectile Motion and Vector Kinematics: A High School & College Primer

L = r × p, the Right-Hand Rule, and Conservation of Angular Momentum — A TLDR Primer

Normal Force, Net Force, and Why Scales Lie in Accelerating Elevators — A TLDR Primer

What the Difference Really Means — A High School & Early College Primer

Superposition, Beat Frequency, and Constructive vs. Destructive Interference — A TLDR Primer

Where Classical Physics Broke and Quanta Were Born — A TLDR Primer

Charge, Voltage, and RC Circuits Decoded — A TLDR Primer

Energy Transformations, Why Perpetual Motion Fails, and E=mc² — A TLDR Primer

Conservative Forces, Elastic PE, and the Work-Energy Theorem — A TLDR Primer

Path Independence, Potential Energy, and When Mechanical Energy Isn't Conserved — A TLDR Primer

Charges, Forces, and the 1/r² Formula — A TLDR Primer

Ohm's Law, Series-Parallel Networks, and Kirchhoff's Rules — A TLDR Primer

Wave-Particle Duality, Photons, and the Double-Slit Paradox — A TLDR Primer

Huygens's Principle, the Minima Condition, and Single-Slit Intensity Unpacked — A TLDR Primer

Wave Superposition, Path Length Difference, and the Fringe Equation Explained — A TLDR Primer

Conservation Laws, Coefficient of Restitution, and the Three Collision Types — A TLDR Primer

Coulomb's Law, Field Lines, and the Force on a Charge — A TLDR Primer

Potential Energy, Equipotentials, and the Voltage–Field Gradient Connection — A TLDR Primer

P = IV, Joule Heating, and the True Cost of Resistance — A TLDR Primer

Magnetic Flux, Faraday's Law, and Lenz's Law Explained — A TLDR Primer

Boltzmann, the Second Law, and Why Disorder Always Wins — A TLDR Primer

Net Torque, Free-Body Diagrams, and the Two Conditions of Equilibrium — A TLDR Primer

Gravitational Potential, the 11.2 km/s Number, and Why Rockets Don't Need to Hit It — A TLDR Primer

Kinematic Equations, Sign Conventions, and g = 9.8 m/s² — A TLDR Primer

Normal Force, Friction, and Newton's Second Law from Diagram to Equations — A TLDR Primer

Static vs. Kinetic Coefficients, the Friction Inequality, and Inclined-Plane Problems — A TLDR Primer

From U = mgh to −GMm/r, Escape Velocity, and Orbital Energy — A TLDR Primer

Carnot, Otto, and the Limits of Heat-to-Work Conversion — A TLDR Primer

The Impulse-Momentum Theorem, Force-Time Tradeoffs, and Why Airbags Work — A TLDR Primer

Tilted Axes, mg sin θ, and the Angle of Slipping — A TLDR Primer

Self-Inductance, Back-EMF, and Transient Behavior in RL Circuits — A TLDR Primer

Focal Points, Ray Diagrams, and the Thin Lens Equation — A TLDR Primer

Impulse-Momentum Theorem, Conservation Laws, and Elastic vs. Inelastic Collisions — A TLDR Primer

Lorentz Force, Circular Motion, and Fields from Currents — A TLDR Primer

Mass Defect, Binding Energy Per Nucleon, and Why E = mc² Powers Fission — A TLDR Primer

Rest Energy, Mass Defect, and the Relativistic Derivation of E = mc² — A TLDR Primer

Gauss's Law, Faraday Induction, and Why Light Is an Electromagnetic Wave — A TLDR Primer

Torque, the Parallel-Axis Theorem, and Rotational Inertia — A TLDR Primer

Normal Force, Static Friction, and Apparent Weight on Inclines and in Elevators — A TLDR Primer

E = mc², Chain Reactions, and the Power of the Nucleus — A TLDR Primer

Simple Harmonic Motion for High School and Early College Physics

Momentum, Energy, and Stuck-Together Objects: A High School & College Primer

Malus's Law, LCD Screens, and the Physics of Polarized Light — A TLDR Primer

P = W/t, Efficiency, and the Kilowatt-Hour — A TLDR Primer

Solving 2D Launch Problems — A High School & College Primer

Tension, Constraint Equations, and the Atwood Machine — A TLDR Primer

Geiger-Müller Tubes, Gray vs. Sievert, and How Ionizing Radiation Damages Living Tissue — A TLDR Primer

Alpha, Beta, Gamma, and the Math of Half-Life — A TLDR Primer

Capacitors, Time Constants, and the RC Charging Curve — A TLDR Primer

Position, Velocity, and Acceleration: A High School & College Primer

Plane, Concave, and Convex Mirrors with the Mirror Equation — A TLDR Primer

n₁sinθ₁ = n₂sinθ₂: The Equation That Bends Light — A TLDR Primer

Galilean Frames, Velocity Addition, and Fictitious Forces — A TLDR Primer

Natural Frequency, Driven Oscillations, and Why Bridges Collapse — A TLDR Primer

Momentum, Exhaust Velocity, and the Tsiolkovsky Equation — A TLDR Primer

Rolling Without Slipping, Moment of Inertia, and the Two-Part Kinetic Energy Equation — A TLDR Primer

Torque, Moment of Inertia, and the Law τ = Iα — A TLDR Primer

Angular Velocity, α, and the Four Rotation Equations — A TLDR Primer

Restoring Forces, Angular Frequency, and Energy in Oscillating Systems — A TLDR Primer

The Four Kinematic Equations, the Missing-Variable Method, and the Five-Step Problem Attack — A TLDR Primer

Work-Energy Theorem, Conservative Forces, and When to Skip F=ma — A TLDR Primer

Longitudinal Waves, the Decibel Scale, and the Inverse-Square Law — A TLDR Primer

Biot-Savart, Amperian Loops, and the Right-Hand Rule for Currents — A TLDR Primer

The Lorentz Factor, Time Dilation, and Length Contraction — A TLDR Primer

Nodes, Harmonics, and Boundary Conditions in Strings and Pipes — A TLDR Primer

Absolute Zero, Latent Heat, and the Q = mcΔT Equation — A TLDR Primer

Free-Body Diagrams, Pulleys, and Newton's Laws Applied to Ropes — A TLDR Primer

Frequency Shifts, Sign Conventions, Shock Waves, and Relativistic Redshift — A TLDR Primer

ΔU = Q + W: Internal Energy, Heat, and Work Explained — A TLDR Primer

Light Quanta, Stopping Voltage, and Einstein's Photon Equation — A TLDR Primer

Wavefunctions, the Particle in a Box, and What Quantization Really Means — A TLDR Primer

A Particle Physics Primer for High School and Early College Students

Wavelength, Superposition, and the 1D Wave Equation — A TLDR Primer

Net Work, Kinetic Energy, and Variable Forces as Integrals — A TLDR Primer

Isobaric, Isothermal, Adiabatic, and Why Work Is the Area Under the Curve — A TLDR Primer

Focal Points, Sign Conventions, and Spherical Mirrors — A TLDR Primer

Phase Shifts, Path Length, and the Conditions for Bright and Dark — A TLDR Primer

Lever Arms, Sign Conventions, and Solving Static Equilibrium — A TLDR Primer

Vector Components, Trig Decomposition, and the Perfectly Inelastic Case — A TLDR Primer

Tangential Speed, v²/r, and the Real Forces Behind Centripetal Acceleration — A TLDR Primer

F = Gm₁m₂/r², Orbits, and Escape Velocity — A TLDR Primer

Components, Unit Vectors, and Vector Addition for Displacement, Velocity, and Acceleration — A TLDR Primer

Magnitude, Direction, and the Physics Behind Projectiles — A TLDR Primer

Constructive, Destructive, and Standing Waves Explained — A TLDR Primer

Reflection, Refraction, and Diffraction at Every Boundary — A TLDR Primer

The Dot Product, Variable Forces, and the Work-Energy Theorem — A TLDR Primer