Statics_of_Rigid_Bodies_01_Concepts - Section 2.1 2.1 The...

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Section 2.1 Solid Mechanics Part I Kelly 9 2.1 The Fundamental Concepts and Principles of Mechanics 2.1.1 The Fundamental Concepts The four fundamental concepts 1 used in mechanics are space , time , mass and force . It is not easy to define what these concepts are. Rather, one “knows” what they are, and they take on precise meaning when they appear in the principles and equations of mechanics discussed further below. The concept of space is associated with the idea of the position of a point, which is described using coordinates ) , , ( z y x relative to an origin o as illustrated in Fig. 2.1.1. Figure 2.1.1: a particle in space The time at which events occur must be recorded if a material is in motion. The concept of mass enters Newton’s laws (see below) and in that way is used to characterize the relationship between the acceleration of a body and the forces acting on that body. Finally, a force is something that changes the acceleration of matter; it represents the action of one body on another. 2.1.2 The Fundamental Principles The fundamental laws of mechanics are Newton’s three laws of motion. These are: Newton’s First Law : if the resultant force acting on a particle is zero, the particle remains at rest (if originally
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This note was uploaded on 01/20/2012 for the course ENGINEERIN 1 taught by Professor Staff during the Fall '11 term at Auckland.

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Statics_of_Rigid_Bodies_01_Concepts - Section 2.1 2.1 The...

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