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Gears can be used to reverse (1) or otherwise change (2,3) the directions of rotation. Gears of different size (1-4) change the speed of rotation.

The American Heritage® Science Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

A man wearing hockey gear.

A man wearing hockey gear.

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