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The classic “Swinging Wonder” is the original American made version of Newton’s Cradle also referred to as balance balls. The Swinging Wonder demonstrator is a dramatic illustration of Newton’s 3rd law of motion which states that action and reaction are equal and opposite. The principal of the demonstrator is used to illustrate the conservation of momentum. An ideal conversation piece for home or office. Five nickel plated steel balls (will not tarnish) suspended in a 9” X 7" X 9” walnut frame.