Kinematics
Velocity vs Speed
You can drive a full lap at 100 km/h and have an average velocity of exactly zero — direction is…
Kinematics
Thermodynamics
The Second Law of Thermodynamics
Heat flows from hot to cold, eggs never unscramble, and time has a direction — all because entropy refuses to…
Classical Mechanics
Friction Force Explained
The force that lets you walk, brake, and tie your shoes is also why nothing keeps moving forever — friction,…
Waves & Optics
Longitudinal Waves Explained
Sound reaches your ears not by air rushing toward you, but by a pattern of squeezes and stretches rippling through…
Classical Mechanics
Angular Momentum
A spinning skater pulls in her arms and speeds up — the same conservation law that keeps planets orbiting and…
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…