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    Pratt School of Engineering, Duke University
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    Learners use a spring scale to drag an object such as a ceramic coffee cup along a table top or the floor. The spring scale allows them to measure the frictional force that exists between the...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    Twin Cities Public Television
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    In this activity (page 2 of PDF under GPS: Kinetic Sculpture Challenge Activity), learners will predict which objects have to overcome the most static friction to slide down a ramp. Learners then...

    free Ages 8 - 14 30 to 45 minutes