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Learners explore the concepts of equilibrium and center of mass by seeing how non-symmetrical objects balance.

1 cent - $1 per student Ages 11 - 18 10 to 30 minutes
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This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

free Ages 8 - 18 10 to 30 minutes
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In this physics activity (page 6 of the PDF), learners will build a class 1 lever and hypothesize and test the distances two objects need to be placed from the fulcrum in order to balance.

1 cent - $1 per student Ages 14 - 18 10 to 30 minutes
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In this activity, learners balance chemical equations and discover the law of conservation of mass. Learners use coins to model molecules to balance the equations.

free Ages 14 - 18 10 to 30 minutes