freefall

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Highway Night Traffic Portland, drive, driving, car, automobile.

What's the Difference Between Speed and Velocity?

Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64

Gravity: From Apples to the Universe

Albert Einstein

100 Years of General Relativity

Discover

Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

Aspirin pills.

7 Drugs that Changed the World

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

freefall: Related Content

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Topics

weightlessness gravity gravitation equivalence principle motion Brownian motion wave motion vibration microgravity linear motion phase action equation of motion mean free path

Quiz

Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.

Physics and Natural Law