Translations:Adventist Youth Honors Answer Book/Health and Science/Physics/93/en
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Galileo asked questions about this law. It is obvious that a feather really does fall slower than a hammer, but he hypothesized that this is because air resistance prevents a feather from falling at full speed. Instead of thinking, as Aristotle did that moving objects tend to come to rest, he thought there might be something holding an object back "frictional forces" that slowed the object down.
