This apparatus provides a safe but dramatic demonstration of the acceleration of a body in a magnetic field and the conservation of momentum. It uses groups of high strength neodymium magnets to accelerate steel ball bearings with the whole assembly contained in a closed, transparent plastic tube for safety. A great discussion experiment on the nature and strength of magnetic fields, momentum, conservation of energy etc.
Dimensions: 700 x 20 x 20mm. Mass: 0.4kg.