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motion

(Encyclopedia)motion, the change of position of one body with respect to another. The rate of change is the speed of the body. If the direction of motion is also given, then the velocity of the body is determined; ...

Clark, William

(Encyclopedia)Clark, William, 1770–1838, American explorer, one of the leaders of the Lewis and Clark expedition, b. Caroline co., Va.; brother of George Rogers Clark. He was an army officer (1792–96), serving ...

D'Alembert's principle

(Encyclopedia)D'Alembert's principle dălˈəmbârzˌ [key], in mechanics, principle permitting the reduction of a problem in dynamics to one in statics. This is accomplished by introducing a fictitious force equal...

Sherman, Roger

(Encyclopedia)Sherman, Roger, 1721–93, American political leader, b. Newton, Mass. Sherman helped to draft and signed the Declaration of Independence. He was long a member (1774–81, 1783–84) of the Continenta...

Scott, Thomas

(Encyclopedia)Scott, Thomas, 1747–1821, English clergyman and biblical scholar. Ordained a priest in 1773, he served in several curacies. In Olney he succeeded (1781) John Newton, through whose influence his view...

Green, William

(Encyclopedia)Green, William, 1872–1952, American labor leader, president of the American Federation of Labor (1924–1952), b. Coshocton, Ohio. He rose through the ranks of the United Mine Workers of America, of...

Berg, Paul

(Encyclopedia)Berg, Paul, 1926–2023, American biologist, b. New York City, Ph.D. Western Reserve Univ., 1952. A professor at Washington Univ. at St. Louis and Stanf...

Fort Clatsop National Memorial

(Encyclopedia)Fort Clatsop National Memorial, now part of Lewis and Clark National Historical Park. See National Parks and Monuments (table) ...

Gage, Thomas, English traveler

(Encyclopedia)Gage, Thomas, d. 1656, English traveler. He went (1612) to Spain to study and became a Dominican. He lived and traveled among the Native populations of Central America from 1625 to 1637, when he retur...

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