Materials 0.0 / 5 ? PhysicsMaterialsA2/A-levelAQA Created by: Jamesgj123Created on: 06-02-17 10:49 What is special about spring constant k? It has the same value in tension and compression, for a spring. 1 of 9 What is Hooke's law? Up to a limit of proportionality, force and extension are proportional 2 of 9 How does plastic deformation occur? Load moves atoms relative to each other; when load is removed, they don't return to their fixed positions 3 of 9 What do ultimate tensile stress and breaking stress depend on? External conditions, like temperature and pressure. 4 of 9 What does the area under a force-extension graph represent? Work done to stretch a material 5 of 9 What does the area under a stress-strain graph represent? Energy per unit volume 6 of 9 What is the yield point? The point on a stress-strain graph at which the material continues to stretch with no extra load 7 of 9 What is elastic limit? Point on a stress-strain graph at which material begins to deform plastically 8 of 9 What is limit of proportionality Point on a stress-strain graph at which a material stops obeying Hooke's law 9 of 9
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