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We study experimentally the collision between a sphere falling through aviscous fluid, and a solid plate below. It is known that there is awell-defined threshold Stokes number above which the sphere rebounds from sucha collision. Our experiment tests for direct contact between the collidingbodies, and contrary to prior theoretical predictions, shows thatsolid-on-solid contact occurs even for Stokes numbers just above the thresholdfor rebounding. The dissipation is fluid-dominated, though details of thecontact mechanics depend on the surface and bulk properties of the solids. Ourexperiments and a model calculation indicate that mechanical contact betweenthe two colliding objects is generic and will occur for any realistic surfaceroughness.

Is there solid-on-solid contact in a sphere-wall collision in a viscous fluid?