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We report a phenomenon that physical perturbations sometimes can benefit thecertainty of a free-fall motion with chaotic modes, albeit, as commonlybelieved, they can ruin it. We statistically compare those factors that maylead to uncertainty, by which we find that the growth of the standard deviationof the landing locations is directly determined by the physical perturbations.A significant yardstick is defined in the meantime. This temporal criterion isof big relevance to the replicability of such problems experimentally, althoughthey are inherently chaotic. Our hypothesis is verified by experiments fromother literature. This outcome also provides a practical strategy to evaluatethe credible prediction time by estimating the disturbances from physicalparameters as a priori.

A physical perturbation based study on the prediction of free-fall disks with chaotic modes in the water