From Zero To Infinity (And Beyond) by Dr. Mike Goldsmith

Author:Dr. Mike Goldsmith [Goldsmith, Dr Mike]
Language: eng
Format: epub, mobi
ISBN: 9781780550923
Publisher: Buster Books

One of Galileo’s real strokes of genius was to realize that the presence of air on Earth affects the way things move. In reality, falling objects reach a steady velocity after a while, called terminal velocity. This is because the drag of the air on them stops them speeding up any further, which is why feathers fall more slowly than cannonballs. If you were to drop a feather and a cannonball on the Moon, where there is no air, they would fall at the same rate.

By imagining how things would fall if there were no air, Galileo recognized that the laws of falling objects were very simple. He realized that they could be described with some quite straightforward mathematics:

Objects fall with a steady, or ‘constant’ acceleration. So, if an object is falling at a particular velocity, after 1 second it will be falling twice as fast; after 2 seconds, 3 times as fast; after 3 seconds, 4 times as fast, and so on.

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