Abstract
After being thrown onto a solid substrate, very soft sphericalgels bounce repeatedly. Separate rheological measurements suggestthat these balls can be treated as nearly elastic. The Hertzcontact deformation expected in the static (elastic) limit wasobserved only at very small impact velocities. For largervelocities, the gel ball deformed into flattened forms like apancake. We measured the size of the gel balls at the maximaldeformation and the contact time as a function of velocities for samples different in the original spherical radius and theYoung modulus. The experimental results revealed a number ofscaling relations. To interpret these relations, we developedscaling arguments to propose a physical picture.
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