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Updated: Mar 17, 2026

Development of an Experimental Setup for the Measurement of the Coefficient of Restitution under Vacuum Conditions
Published on: March 29, 2016
Coefficient of restitution mediated by a diamagnetic interaction
A J Batista-Leyva1, J C Ruiz-Suárez2
1Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC), Salvador Allende esq. Luaces s/n, Plaza de la Revolución CP 10400, POB 6163, La Habana, Cuba.
Abstract:
We study how a magnetic bead bounces onto a horizontal diamagnetic conducting plane. The bead, falling down by gravity from a certain height, produces an Eddy current that creates a repelling force. For low velocities the bead is trapped by the surface, for intermediate ones it escapes. In such a case the induced current changes its sign, and so does the force. The balance between diamagnetic and viscoelastic interactions determines the bouncing dynamics. We find experimentally the restitution coefficient as a function of the impact speed of the bead and develop, taking into account simple energetic considerations, a model able to reproduce our findings.
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