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Magnetic Cannon
Description: The magnetic cannon contains four spaced neodymium magnets in a channel. Two balls bearings are placed between each ball bearing. When a new ball bearing is introduced a transfer of energy occurs and the final ball bearing leaves with a higher initial velocity than the first. This is a great phenomenon for studying transfer of momentum and the energy of an object based on its position within a magnetic field.
Web Resource: Magnetic Challenge with Bozeman Science