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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.
Magnetic beads can bounce or be trapped by conducting surfaces due to gravity-induced eddy currents. The bead
Area of Science:
- Physics
- Materials Science
Background:
- Investigating the interaction between magnetic objects and conducting surfaces.
- Understanding the role of eddy currents in repelling forces.
Purpose of the Study:
- To analyze the bouncing dynamics of a magnetic bead on a diamagnetic conducting plane.
- To determine the factors influencing whether a bead is trapped or escapes the surface.
- To model the restitution coefficient based on impact speed.
Main Methods:
- Experimental observation of magnetic bead bouncing.
- Measurement of the restitution coefficient as a function of impact speed.
- Development of a model based on energetic considerations.
Main Results:
- Observed that magnetic beads can be trapped or escape depending on velocity.
- Identified that eddy currents and their associated repelling forces change sign with velocity.
- Found the restitution coefficient is dependent on impact speed.
Conclusions:
- The balance between diamagnetic and viscoelastic interactions governs bouncing dynamics.
- A developed model successfully reproduces experimental findings on restitution coefficient.
- Eddy current generation is key to the observed repulsion and trapping phenomena.
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