Physics 1021 Study Guide - Final Guide: Elastic Energy, Electric Dipole Moment, Electric Potential Energy
22 Apr 2013
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Responds with change of shape to external forces. The response to stretching is stress and strain. Stress: a force exerted per unit area of surface of the extended object, has unit of [pa] Each type of strain is caused by a different form of stress: stretching is caused by tensile stress, twisting is caused by shearing stress, compression or expansion is caused by hydraulic stress. If, after the stress is removed, the object returns to its original shape, the deformation was elastic. Stress and strain are proportional to each other in elastic formation. If stress and strain are linearly proportional to each other, we can write: Near mechanical equilibrium, a linear relation exists between the cause of the deformation (stress) and the response by the extended object (strain) The linear relation between stress and strain is called hooke"s law. The proportionality factor y is called young"s modulus with a unit of [pa]
