acceleration

Science Dictionary
acceleration  [%PREMIUM_LINK%]     (āk-sěl'ə-rā'shən)  Pronunciation Key 
The rate of change of the velocity of a moving body. An increase in the magnitude of the velocity of a moving body (an increase in speed) is called a positive acceleration; a decrease in speed is called a negative acceleration. Acceleration, like velocity, is a vector quantity, so any change in the direction of a moving body is also an acceleration. A moving body that follows a curved path, even when its speed remains constant, is undergoing acceleration. See more at gravity, relativity.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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