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Product Information An inexpensive way to demonstrate the principles of the center of gravity, mass, moment of force, and torque, this innovative device was designed by teacher Bruce Yeany. Constructed of wood, this apparatus is fitted with a 30.5 cm moveable plastic arm, clips, and eight vinyl-dipped lead weights. Comes with instructions. Grades 8–10. Size: 18cm H.  Tell a Friend about this item
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