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Forces on the Human Molecule
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In this physical activity, two lines of learners link hands and arms to model a beam subject to various loading schemes.

Masses & Springs
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In this online activity, learners use a realistic mass and spring laboratory. They hang masses from springs and adjust the spring stiffness and damping.
Floating Paperclip and Other Surface Tension Experiments
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In this activity, learners experiment with surface tension using everyday household items such as strawberry baskets, paperclips, liquid dish soap, and pepper.

Earthquake Energy
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In this geology activity (page 3 of the PDF), learners simulate an earthquake with little more than an elastic band and drinking straws.