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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| De motu antiquiora | 6/12 | https://en.wikipedia.org/wiki/De_motu_antiquiora | reference | science, encyclopedia | 2026-05-05T08:51:23.985272+00:00 | kb-cron |
When solids lighter than water are completely submerged in water, they are carried upward with a force measured by the difference between the weight of a volume of water equal to the volume of the submerged body and the weight of the body itself. In other words, Galileo argues that natural motion is based on an object's apparent weight. He concludes that if we wish to know at once the relative speeds of a same body in two different media, we take an amount of each medium equal to the volume of the body, and subtract from the weights of each medium the weight of the body. The numbers found as remainders will be to each other as the speeds of the motions. Similar arguments are then made for the ratios of speeds of two bodies equal in volume but unequal in weight moving the same media in both upward and downward motion. By the end of the chapter, Galileo provides the ratio of the speeds for natural motion made of the same or different material, in the same medium or in different medium, and in natural motion upward or downwards. Galileo ends the chapter claiming that lighter bodies will initially move ahead of the heavier – a claim that is revisited in Chapter 22.