Compression
Special apparatus (shown below) was constructed
in order to perform compression tests of all the
balls. The top plate was designed to slide with very
little friction, allowing the ball to compress as
mass was applied to the top.
Preliminary results are shown below,
but data is still being analyzed. Qualitatively, we
find that the leather balls compress more easily
under the same load, compared to the synthetic
balls. The compression is linear over reasonable
range of forces; we are in the process of
quantitatively determining the elasticity.
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