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Wadena-Deer Creek High School junior Christina Wolden checks the balance on her mobile in Craig Klawitter's physics class.

Wadena-Deer Creek High School junior Christina Wolden checks the balance on her mobile in Craig Klawitter's physics class. Students were learning about rotational equilibrium, with hands-on experience. Simple engineering problems, like building a mobile, teach students how to calculate locations of a variety of weights. If the math works, the mobiles hang horizontally with no adjustments.

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