In this chapter we discuss certain properties of rigid bodies related to their weight, their mass and their geometrical form. These properties arise in the mechanics of rigid bodies when we are led to define certain quantities that are representative of the body as a whole. For example, we have already used the result that the ravitational forces on the individual particles of a rigid body reduce to a single force acting at some well-defined point in the body; if the location of this pointis known in a particular case the analysis is obviously greatly simplified.
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