Wood Dynamics Carts, Ideal For Demonstrating Newton'S Laws Of Motion., Each

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Carts made with low-friction ball-bearing wheelstop surface can be loaded with additional massesone cart in each set is equipped with an “exploder piston,” activated by a trigger on top that can be preset to three positionsspring-steel hoop bumpers used for collision and energy experimentsorder infosold as a set of two carts.