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    WGBH
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    In this design challenge activity, learners invent a way to send a Ping-Pong ball flying high enough to catch it - like football with a twist! Learners use paint stirrers, a wooden spool, tape, and...

    $1 - $5 per student Ages 8 - 14 30 to 45 minutes
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    PhET
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    In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, learners can set initial positions, velocities, and masses...

    free Ages 11 - adult 10 to 30 minutes
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    Twin Cities Public Television
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    In this physical sciences activity, learners explore friction. Learners investigate the factors that affect the force required to move an object. Learners prepare weighted shoeboxes and then...

    $5 - $10 per group Ages 8 - 14 45 to 60 minutes
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    Twin Cities Public Television
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    In this engineering activity, learners explore simple machines and then build cardboard automata using cams. Learners are also challenged to build a complex machine--a moving sculpture that tells a...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours
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    WGBH
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    In this activity, learners make plates levitate! Learners build "hovercrafts" using simple materials to explore friction and motion. <b>[Activity is publicly available through a web...

    $1 - $5 per student Ages 6 - 11 5 to 10 minutes
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    WGBH
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    In this activity, challenge learners to design a roller coaster ride for a marble using cardboard and other simple materials. The goal is to have the marble go slow, so it takes as long as possible...

    $1 - $5 per student Ages 6 - 11 30 to 45 minutes
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    WGBH
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    In this activity, learners build a racecar using only a rubber band, spool, straw, and paper clip! This racer is a classic toy that zips across a flat surface. The activity links to different ideas...

    1 cent - $1 per student Ages 6 - 11 30 to 45 minutes
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    WGBH
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    In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink? Learners must adjust many variables in their boat design to maximize...

    1 cent - $1 per student Ages 6 - 11 45 to 60 minutes
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    WGBH
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    In this activity, learners will build a roller coaster for a marble to run on using everyday household materials such as paper towel or toilet paper rolls, cups, boxes, books, buckets, chairs, etc....

    $1 - $5 per group Ages 6 - 11 30 to 45 minutes
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    The Tech Interactive
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    This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create. Some linkages, like scissors, are simple, while others...

    $1 - $5 per student Ages 8 - adult 10 to 30 minutes