Classical Mechanics
Power in Physics
Power is not how much work you do but how fast you do it, and grasping that distinction explains everything…
Classical Mechanics
Modern Physics
The Photoelectric Effect
A simple experiment with light knocking electrons off metal refused to obey wave physics, and Einstein's explanation forced the world…
Classical Mechanics
Momentum and Impulse
Momentum is the stubbornness of moving things, and impulse is how you change it, which is why airbags, follow-through, and…
Modern Physics
The Speed of Light
Light's speed is not just fast, it is the universe's ultimate speed limit and the thread that ties space and…
Modern Physics
Wave-Particle Duality
Light and matter both behave as waves in some experiments and as particles in others, and learning to hold both…
Classical Mechanics
Newton’s Law of Universal Gravitation
With one equation, Newton revealed that the force pulling an apple to the ground is the same force holding the…
Waves & Optics
Young’s Double-Slit Experiment
By shining light through two narrow slits and watching bright and dark bands appear, Thomas Young proved light is a…
Thermodynamics
Heat Transfer: Conduction, Convection and Radiation
Heat always flows from hot to cold, but it travels by three very different routes, and knowing which one is…
Electromagnetism
Electromagnetic Induction
Move a magnet near a coil and a voltage appears from nothing — this is the simple, profound trick behind…
Modern Physics
The Heisenberg Uncertainty Principle
Nature sets a hard limit on how precisely you can know a particle's position and momentum at once — not…