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

What's the Difference Between Speed and Velocity?

Sledgehammer breaking rocks. (demolishing, crushing, blurred motion)

Can Anything Break if You Hit It Hard Enough?

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

Discover

Malayan Leaf Frog - Megophrys nasuta

9 Animals That Look Like Leaves

Close-up of ostriches (Struthio camelus) necks and heads; location unknown.

6 of the World's Most Dangerous Birds

Panama Canal infographic

Timeline and Map of the Panama Canal

Prince. musician Prince (Prince Rogers Nelson). Prince WELCOME 2 AMERICA tour. Exclusive North American Performances, 2010-11

7 Celebrities You Didn’t Know Were Inventors

American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

What’s the Difference Between Bison and Buffalo?

Nazi Germany, Nazi SS troops marching with victory standards at the Party Day rally in Nuremberg, Germany, 1933. (Schutzstaffel, Nazi Party, Nurnberg)

Why Was Nazi Germany Called the Third Reich?

Flag of Bhutan

6 Small Kingdoms of the World

wear: References & Edit History

More Articles On This Topic

Assorted References

lubrication
- In lubrication
tribology
- In tribology

Article Contributors

Primary Contributors

The Editors of Encyclopaedia Britannica

Article History

Type	Description	Contributor	Date
	Article added to new online database.	The Editors of Encyclopaedia Britannica	Jul 20, 1998