A very popular air disk is the Air Power Soccer Disk, available at a variety of locations including Amazon, Walmart, and Educational Innovations, Inc. at prices ranging from about $5 to $17. Powered by four AA batteries, it rides on a cushion of air on any reasonably smooth surface. While kids love to kick it around like a soccer ball, it is also a great companion for PocketLab Voyager when studying physics principles. In this lesson, students quantitatively investigate the deceleration of an air disk as it revolves in a circle on a table top
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