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This is an activity about friction as well as kinetic and potential energy.

In this activity, learners use heat to separate zinc and copper in a penny. This experiment demonstrates physical properties and how physical change (phase change) can be used to separate matter.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.