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Physics Facts

Newton's First Law of Motion

Sir Isaac Newton first presented his three laws of motion in the 'Principia Mathematica Philosophiae Naturalis' in 1686. His first law states that every object will remain at rest or in uniform motion ... Continue reading

The story of Isaac Newton discovering the laws of gravity by watching apples falling from a tree is probably just a myth. He did do his work on gravity while at a farm, but that is about as much as can be proven.

How Fast is Mach 1?

A Mach number is a common ratio unit of speed when one is talking about aircrafts. By definition, the Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed ... Continue reading

Mach 1: Fast planes and Ernst Mach

Tick-Tock Atomic Clock

Modern navigators rely on atomic clocks. Instead of old-style springs or pendulums, the natural resonances of atoms -- usually cesium or rubidium -- provide the steady 'tick' of an atomic clock. The ... Continue reading

24 GPS satellites orbit Earth.

Neutrinos to the Rescue

Have you ever wondered what the most abundant particle in the universe is after photons of light? The answer is: Neutrinos. These tiny, neutral and almost mass-less particles that move at almost the ... Continue reading

Beta Decay