Classical Mechanics
Angular Momentum
A spinning skater pulls in her arms and speeds up — the same conservation law that keeps planets orbiting and…
Classical Mechanics
Electromagnetism
Electric Field and Potential
One tells a charge which way to go, the other how much energy it carries — together they map the…
Classical Mechanics
Torque in Physics
Why pushing a door near its hinge barely moves it, and how the same twisting physics tightens a bolt and…
Classical Mechanics
Kinetic Energy
Kinetic energy is the energy of motion, and understanding why it scales with the square of speed reshapes how you…
Modern Physics
Nuclear Fission and Fusion
Splitting heavy nuclei and merging light ones both release staggering energy, and the reason lies in a single curve describing…
Waves & Optics
Reflection and Refraction
Why mirrors bounce light and lenses bend it comes down to two simple rules about angles, and a single number…
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…
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…