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Excerpt from The Elementary Principles of Mechanics, Vol. 2: Statics Any limited portion of matter we call a body. A body so small that, so far as its motion is concerned, we can disregard its size we call a material point or particle. Just as a mathematical point, having no dimensions, cannot rotate, but can have motion of trans lation only, so a material point or particle is considered as having motion of translation only. Ever body may be considered as a system composed of such materia points or particles. The diagram representation of a particle is then a mathematical point, bavin position only. When a Ody has motion of translation only, the motion of every one of its points at any instant is the same (page 13, Vol. I), and in such case we may then consider the entire body, whatever its size, as a particle and represent it by a mathematical point. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com 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.