Sunday, November 28, 2010

Physics: You spin me round round...

What do bicycles, frisbees, yo-yos, hula hoops, dreidels, and even the earth have in common? They all spin, and so long as they spin the better they are at resisting what gravity is trying so hard to get them to do, which is tumble and fall. The tendency of an object to resist change, is called inertia, or in the case of something spinning, rotational inertia. This week the kids were given plastic plates of different sizes, sticks, and weights (in the form of kippa clips) and were challenged to design the dreidel with the greatest rotational inertia...that's fancy talk for the dreidel that can spin the longest.

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