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Limitations of Hooke's law

Hooke's law is not a universal principle. The law applies to many materials as long as they are not stretched too far.

Hooke's law ceases to apply beyond a certain extension, and permanent deformation may result if the material is stretched beyond the elastic limit.

Hookean materials are materials for which Hooke's law applies (for a given range of extension).

In the first section, the graph is a straight line (i.e. within the elastic limit). The graph becomes non-linear beyond this limit.
In the first section, the graph is a straight line (i.e. within the elastic limit). The graph becomes non-linear beyond this limit.