Excerpt from An Introduction to Astronomy An illustration will make the process clearer than an extended argument. Obviously, all men have observed moving bodies all their lives, yet the fact that a moving body, subject to no exterior force, proceeds in a straight line with uniform speed was not known until about the time of Galileo (1564 - 1642) and Newton (1643 When the result is once enunciated it is easy to recall many confirmatory experiences, and it now seems remarkable that so simple a fact should have remained so ...
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Excerpt from An Introduction to Astronomy An illustration will make the process clearer than an extended argument. Obviously, all men have observed moving bodies all their lives, yet the fact that a moving body, subject to no exterior force, proceeds in a straight line with uniform speed was not known until about the time of Galileo (1564 - 1642) and Newton (1643 When the result is once enunciated it is easy to recall many confirmatory experiences, and it now seems remarkable that so simple a fact should have remained so long undiscovered. It was also noted by Newton that when a body is acted on by a force it has an acceleration (acceleration is the rate of change of velocity) in the direction in which the force acts, and that the acceleration is proportional to the magnitude of the force. Dense bodies left free in the air fall toward the earth with accelerated velocity, and they are therefore subject to a force toward the earth. Newton observed these things in a large number of cases, and be inferred by induc tion that they are universally true. He focused particularly on the fact that every body is subject to a force directed toward the earth. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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