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Watching and listening to the coefficient of restitution
The Physics Teacher, 2011Abstract We discuss the measurement of the coefficient of restitution (COR) and the acceleration of gravity g using video and sound analysis with both Tracker and Logger Pro 3 software. Measuring COR of a bouncing ball is a common activity in physics labs from high school to intro level college courses (e.g., measuring COR to obtain gravitational ...
Marco Ciocca, Jing Wang
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Coefficient of restitution mediated by a diamagnetic interaction
The European Physical Journal E, 2016We 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.
A J, Batista-Leyva, J C, Ruiz-Suárez
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Measurement of coefficient of restitution made easy
Physics Education, 2005We present a simple activity that permits students to determine the coefficient of restitution of bouncing balls using only a stopwatch, a metre stick and graphical analysis. The experiment emphasizes that simple models, in combination with careful attention to how students make measurements, can lead to good results in a straightforward way.
N Farkas, R D Ramsier
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Listening to the coefficient of restitution
American Journal of Physics, 1977A pedagogical method is described for measurement of the coefficient of restitution for collisions between a bouncing ball and a horizontal surface. Indirect measurement using only the sound made by the bouncing ball facilitates the rapid collection of data, allowing introductory laboratory students more time to concentrate on theory, method, data ...
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A coefficient of restitution of rock materials
Computers & Geosciences, 2008At a macroscopic scale, even a purely elastic contact between rock particles is accompanied by energy dissipation. The resulting hysteretic loop of the stress/strain path during such a loading and unloading event suggests that grains recover slower to their original shape than when they were first deformed.
B. Imre, S. Räbsamen, S.M. Springman
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DYNAMIC FORMULATION OF COEFFICIENT OF RESTITUTION
1964Abstract : The paper is concerned with the preparation of a mathematical model involving collisions between two bodies and the subsequent analog computer program. It considers a fictitious damped spring as a coefficient of restitution generator'. Formulae are derived for spring stiffness and the viscous damping in both one and two degrees, of freedom.
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Contact Mechanics and Coefficients of Restitution
2001We assume that the energy dissipated during collisions between solid bodies is due to plastic deformation at the contact. The normal and tangential interactions between elastic and elastic-perfectly plastic spheres are discussed. For elastic-perfectly plastic spheres an analytical solution for the normal coefficient of resitution is presented which is ...
Colin Thornton +4 more
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Coefficient of Restitution by Video Analysis
2017The coefficient of restitution of a tennis ball falling on two different kind of floors is investigated. The video analysis is used and it is shown that this is a simple method to obtain the restitution coefficient of several pair of materials, measuring just the initial height of the ball made of one substance and the maximum height after the ...
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