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Published on Nov 15, 2008
Purchase: http://hilaroad.com/video This video resource is designed to provide a basic introduction to gears suitable for grades 4 to 9. Gear rotation, gear ratio, rates of rotation, mechanical advantage and examples of use are included. A second video, " Time, Clocks and Gears" explains how gears are used in mechanical clocks to control the hands on an analog clock.