Which one of the following does not generally obey Hooke's law?
Clay
Hooke's law states that within the elastic limit, stress is directly proportional to strain, which holds well for elastic materials that return to their original shape once the deforming force is removed — this includes glass, quartz and copper, which behave nearly elastically for small deformations.
Clay, on the other hand, is a plastic (ductile) material: even small applied forces cause it to deform permanently without a proportional, reversible stress-strain relationship, so it does not generally follow Hooke's law.
Hence, clay is the material that does not generally obey Hooke's law.
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