Kinematics
The SUVAT Equations
Five letters and four equations let you solve almost any problem of motion under constant acceleration — from a dropped…
Kinematics
Classical Mechanics
Centre of Mass
Every object behaves, for the purposes of motion, as if all its mass were squeezed into a single magic point…
Modern Physics
Radioactive Decay
Unstable atomic nuclei transform at random, yet vast collections of them obey a clockwork law precise enough to date the…
Classical Mechanics
Tension Force
A rope cannot push, only pull — and that single rule explains how ropes, cables and strings transmit force across…
Kinematics
Why Is Projectile Motion a Parabola?
Throw anything through the air and it traces the same elegant curve — and the reason is a simple separation…
Classical Mechanics
Normal Force Explained
The invisible push a surface gives back when you press on it is the normal force — and it is…
Thermodynamics
The Kinetic Theory of Gases
Temperature, pressure and the gas laws all emerge from one simple picture — countless tiny molecules flying about and bouncing…
Waves & Optics
Wave Speed, Frequency and Wavelength
Three quantities describe every wave in the universe, and one tidy equation ties them together — master it and you…
Classical Mechanics
Gravitational Force and Newton’s Law of Gravitation
The same force that drops an apple holds the Moon in orbit, and Newton captured it all in one famous…
Thermodynamics
The First Law of Thermodynamics
The first law is energy bookkeeping for heat and work, proving that you can never get something for nothing in…