How does this magnetic cannon work?

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As part of their study of motion, the 8th graders have been trying to figure out how a magnetic cannon works.  The cannon is a series of five metal ball bearings and a magnet as shown in the photo above.  The single ball on the one end is rolled toward the system and only the last ball shoots out.  This week the 8th graders are synthesizing all of the scientific principles they have learned about motion in order to create an infographic explaining how the magnetic cannon works. Creating the infographic required that kids really dig deep and really understand and apply their knowledge of forces, energy and Newton’s Laws of Motion. Ask them about how it works!