## A Beka Physics 12 Chapter 5

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msbookkeeper12  on November 3, 2011

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# A Beka Physics 12 Chapter 5

 Elasticitythe ability to recover their original shape after being deformed by an external force
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#### Definitions

Elasticity the ability to recover their original shape after being deformed by an external force
Rigidity the tendency to resist flexing or deforming
Resilience the amount of deformation required to bring a material to its elastic limit
Elastic limit the point past which a material will not recover its original shape
Plasticity the maximum amount of relative deformation that may be permanently imposed upon it
Mechanical working the various processes used to impose desired shapes upon ingots of newly refined metal
Forging metal squeezed or pounded with great force between two dies
Rolling metal pressed down by a series of paired, heavy rollers into a continuous sheets
Malleability the property of a metal that allows it to be rolled or hammered into a sheet
Tensile force the stretching or compressing force of the load
Hooke's law the force of the wire pulling upward is proportional to its displacement downward and that the restorative force acts in the opposite direction of the displacement; F=kx
Restorative force the force acting against the tensile force
Stress the deformative tensile force per unit cross-sectional area
Strain the relative amount of deformation compared to the original length
Tensile stress tension
Young's Modulus the proportionality constant; F/A=Y(l/l)
Proportional limit the restorative force in the wire is no linger a linear function of elongation
Elastic limit the maximum stress the material can sustain without being permanently deformed
Ultimate tensile strength the maximum stress the material can sustain without breaking
Breaking point represents the maximum strain tolerated by the wire; further stretching causes the wire to break
Brittle substances that break suddenly under a load instead of deforming first
equilibrium the distance where there is no net attraction or repulsion; represents the standard relative positions when the particles are stable and unstressed
Shear the combination of two oppositely directed forces along parallel lines of action
Volume stress stress that causes bulk deformation

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