Fri, 22 Jul 2016 07:57:08 GMT

PhET: Forces and Motion: Basics

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[ "article:topic", "Force", "friction", "Newton\u2019s first law", "speed", "showtoc:no" ]

[ "article:topic", "Force", "friction", "Newton\u2019s first law", "speed", "showtoc:no" ]

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