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Physics Facts

What Makes a Frisbee Fly?

If you have ever been to the park or the beach, you've probably seen one of these plastic discs flying through the air. We're not talking about a UFO, we're talking about the Frisbee, more commonly ... Continue reading

Frisbee

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

Coming In Strong On Your AM Dial

The AM radio dial would be nothing but chaos and noise without a very basic rule - turn down the power at night. The Federal Communications Commission (FCC) controls and regulates the airwaves in the ... Continue reading

AM Wave Deflection

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.