Classical Mechanics
Work Done in Physics
Carrying a heavy box across a flat room does zero physical work — here is why physics defines effort so…
Classical Mechanics
Electromagnetism
Magnetic Fields and Forces
Magnetism only acts on charges that move, and the force it delivers always pushes sideways — never speeding anything up.
Kinematics
Free Fall and Terminal Velocity
A feather and a hammer fall at the same rate in a vacuum — but in air, drag eventually wins…
Kinematics
Velocity vs Speed
You can drive a full lap at 100 km/h and have an average velocity of exactly zero — direction is…
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…