http://portal.acs.org/portal/fileFetch/C/CSTA_015021/pdf/CSTA_015021.pdf - 1 views
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thennessy on 18 Feb 12This is a great activity to talk bout simple machines and what they are. Everybody in the primary grades we enjoys the see-saw, so having an activity using a see-saw for a differentis attention getting. We can focus on key terms of this simple mahine and also use the see-saw as a weighing machine.