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The action of this weight on the point to which it is attached is the same as the action of a lever suspended by this point which is also its midpoint and loaded at its two extremities by two weights each equal to half of this weight. Moreover, it is obvious that nothing prevents us from approaching this latter lever from the standpoint of the former. In short, that it belongs to or which is perhaps more rigorous, this latter lever can be considered as held in equilibrium by a force applied at its midpoint directed vertically upward and equal to the weight of the two halves which are assumed applied at its ends.

169 TABLE OF CONTENTS 5 SECTION II. A GENERAL FORMULA OF DYNAMICS FOR THE MOTION OF A SYSTEM OF BODIES MOVED BY ARBITRARY FORCES . . . . . 184 SECTION III. GENERAL PROPERTIES OF MOTION DEDUCED FROM THE PRECEDING FORMULA . . . . . . . . . 190 Subsection I. Properties Relative to the Center of Gravity . 190 Subsection II. Properties Relative to Areas . . . . 194 Subsection III. Properties Relative to Rotations Created by Impulsive Forces. 200 Subsection IV. Properties of a Freely Rotating Body of Arbitrary Shape about .

However, some investigators have suggested that Lagrange's use of the Principle of Virtual Work would naturally occur in this work. They point out that it would have been natural for Lagrange to begin with statics and to follow this subject with dynamics in his class presentations. This is the usual order for these two subjects and it would have been most natural to use the Principle of Virtual Work in statics. Then this application of the Principle of Virtual Work would naturally carry over to dynamics.

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A guide to making energy-smart purchases by Energy Efficiency and Renewable Energy Clearinghouse (U.S.)


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