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Second-class lever station

A second-class lever made with a wooden ruler and a 100 gram mass being measured with a spring scale

<img typeof="foaf:Image" src="http://statelibrarync.org/learnnc/sites/default/files/images/second_class_lever_station.jpg" width="806" height="604" alt="Second-class lever station" title="Second-class lever station" />
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