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The Giornata Sesta about the Force of Percussion is a relatively less knownChapter from the Galileo's masterpiece "Discourse about Two New Sciences". Itwas first published lately (1718), long after the first edition of the Two NewSciences (1638) and Galileo's death (1642). The Giornata Sesta focuses on howto quantify the percussion force caused by a body in movement, and describes avery interesting experiment known as "the two-bucket experiment". In thispaper, we review this experiment reported by Galileo, develop a steady-statetheoretical model, and solve its transient form numerically; additionally, wereport the results from one real simplified analogous experiment. Finally, wediscuss the conclusions drawn by Galileo -- correct, despite a probablyunnoticeable imbalance --, showing that he did not report the thrust forcecomponent in his setup -- which would be fundamental for the correctcalculation of the percussion force.

How big was Galileo's impact? Percussion in the Sixth Day of the "Two New Sciences"