9/10/2023 0 Comments Chase transaction history with url![]() ![]() This topic is part of the study of statics in mechanics. In this module we are interested in the application of balanced forces, as indicated in Figure 1, so that the net force will be zero. The application of external forces to an object will lead to acceleration if the net force is not zero. External forces are applied only to the end atoms in the rod. However, if you have difficulty with more than two of the Exit questions you are strongly advised to study the whole module.įigure 2 A model for a solid rod with complicated interatomic forces replaced by springs. If you have difficulty with only one or two of the questions you should follow the guidance given in the answers and read the relevant parts of the module. If you are sure that you can meet each of these achievements, try the Subsection 5.3Exit test. Study comment Can you answer the following Fast track questions? If you answer the questions successfully you need only glance through the module before looking at the Subsection 5.1Module summary and the Subsection 5.2Achievements. If not, proceed directly to the Subsection 1.3Ready to study? section. If so, try the following Fast track questions. Study comment Having read the introduction you may feel that you are already familiar with the material covered by this module and that you do not need to study it. Finally, we describe the phenomena of surface tension and capillarity. Stoke’s law is described, and the existence of a terminal speed for a body falling through a fluid is discussed. We introduce the usual phenomenological descriptions of these, as well as briefly discussing their microscopic basis. In Section 4 we then consider in some detail the ways in which both solids and liquids interact with their environment through effects which occur at surfaces and interfaces, including the familiar phenomenon of friction between solids and the analogous process of viscosity with fluids. This discussion includes hydrostatic pressure, Pascal’s principle, Archimedes’ principle and the phenomenon of buoyancy. ![]() In Section 3 we then examine fluids and describe the more limited, but equally important, ways in which they respond to external forces. We consider tensile, uni-axial compressive, shear and bulk compressive stresses and strains, introducing shear modulus and bulk modulus. ![]() We introduce the properties of elasticity and plasticity, stress, strain, Hooke’s law and Young’s modulus. In Section 2 we examine solids and the ways of characterizing their behaviour in terms of their elastic properties. We are interested in the manner in which the external forces distort or deform a body. In this module we consider the response of matter to external forces, but always under the application of balanced forces so there is no acceleration of the body as a whole. ![]()
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