a) Key terms

a) tensile and compressive deformation; extension and compression

f) elastic and plastic deformations of materials

tensile deformation = the change in shape of an object when it is stretched

compressive deformation = the change in shape of an object when it is compressed

elastic deformation = the change in shape of an object under a force where the object returns to its original shape after the force has been removed

plastic deformation = the change in shape of an object under a force where the object does not return to its original shape after the force has been removed

elastic limit = the maximum stress that can be applied to a spring without causing plastic deformation

limit of proportionality = the point where Hooke’s law is no longer applicable to a spring when under a force