What are the factors on which coefficient of restitution depend? What is the reason for more coefficient of restitution of two glass balls (0.95) than for two lead balls (0.20)?
Answer
The only factor is the capacity to return to the original shape when it is deformed by an external force.
An elastic object recovers its shape after it has been compressed and deformed, if you crush a plastic bottle and remove the cap it will partially return to his original length, a lead ball is almost completely irreversibly deformed.
The Coefficient of Restitution measures the percentage of this capacity.
Here below you can watch an exceptional clip of a golf ball completely squashed flatten on a wall that completely recovers its shape
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