Key Terms and Concepts
- Identify and define the features of a stress-strain curve, including stress, strain, elastic region, elastic modulus, elastic limit, plastic region, ultimate strength, and fracture/rupture.
- Acquire stress-strain data and calculate the elastic modulus from stress-strain data.
- State Hooke’s Law and define spring constant.
- Apply the Hooke’s Law along with the definitions of stress, strain, and elastic modulus to calculate the deformations of structures. 
the force that is provided by an object in response to being pulled tight by forces acting from opposite ends, typically in reference to a rope, cable or wire
reduction in size caused by application of compressive forces (opposing forces applied inward to the object).
a physical quantity that expresses the internal forces that neighboring particles of material exert on each other
the measure of the relative deformation of the material
the maximum stress a material can withstand
the range of values for stress and strain values over which a material returns to its original shape after deformation
the maximum stress that can be applied to a material before it leaves the linear region
the range of values for stress and strain over which a material experiences permanent deformation
the value of the stress (yield stress) and strain (yield strain) beyond which a material will maintain some permanent deformation
liable to break or shatter due to relatively inability to deform under stress (not ductile)
able to be deformed without failure, pliable, not brittle
measures of resistance to being deformed elastically under applied stress, defined as the slope of the stress vs. strain curve in the elastic region
the restoring force exerted by a spring is equal to the displacement multiplied by spring constant
measure of the stiffness of a spring, defined as the slope of the force vs. displacement curve for a spring