How does a drinking straw balance work?

Details How does a drinking straw balance work? How does a drinking straw balance work?

2011-04-08

arxiv.org/abs/1104.1494v2

Physics

Popular Physics

10 pages, 1 table, 4 figures; typos corrected, one reference added

Scientific paper

We examine working mechanism of a drinking straw balance. Unlike the usual horizontal level balances which rely on the pivotal rotation, a drinking straw balance shows rolling motion. Because of this rolling and relative position between the pin and the center line of a straw, a new equilibrium state is possible after placement of a test mass. Relative errors between the measured values by a drinking straw balance and an electronic scale are order of 22%. Minimum value of a measurable mass by a straw balance is order of 10 mg.

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