Abstract
In 1851, Stokes (in insert) calculated the friction force on a cylinder in oscillating motion, neglecting the nonlinear term of the Navier-Stokes equation, an approximation valid for vanishing values of the Reynolds number Re. Previous tests were performed with Re>0.1 and frequently with Re>>1. We have measured the oscillation of a macroscopic gravity pendulum. Our position detector with a submicrometer sensitivity enables us to record very small oscillation amplitudes, corresponding to Re=0.0002. The friction force deduced from the damping time constant is in very good agreement with Stokes' calculation.
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