Unit 1.5 Physics 0.0 / 5 ? PhysicsForcesASWJEC Created by: TigerLilly321Created on: 10-04-17 18:08 Hooke's law The tension in a spring or wire is proportional to its extension from its natural length, provided the extension is not too great. 1 of 11 Spring constant, k The force per unit of extension. Unit: Nm^-1 2 of 11 Stress, σ Stress is the force per unit cross-sectional area when equal opposing forces act on a body. Unit: Pa or Nm^-2 3 of 11 Strain, ε Strain is defined as the extension per unit length due to an applied stress. Unit: none 4 of 11 Young modulus, E Young modulus E = tensile stress / tensile strain (Unit: Pa or Nm^-2) 5 of 11 Crystal Solid in which atoms are arranged in a regular array. 6 of 11 crystalline A solid whose atomic arrangement shows both short and long-range order 7 of 11 amorphous A solid whose atomic arrangment shows little or no short-range order and no long-range order at all 8 of 11 polymeric Long chains of atoms that make up the molecules in a polymer have a specific short-range order, but there is little or no long-range order 9 of 11 grain boundery The line formed where two or more crystals bond together 10 of 11 dislocloations A point where planes of atoms are not perfectly 'matched up' and the repeating pattern of atoms is interrupted 11 of 11
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