Question

. Name two materials which do not obey

Hooke’s law.​

Answer 1

Hooke’s Law states that, for certain elastic materials, force is directly depends on extension, when a sample (substance) is stretched. Materials that obey Hooke’s law are called Hookean Materials. There is nothig in universe which does not obey Hook’s law because every substance has a elasticity with elastic limit.

Answer 2

Hooke's law state that -  " The force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance — that is, Fₛ = - kx, where k is a constant factor characteristic of the spring (i.e., its stiffness), and x is small compared to the total possible deformation of the spring ".

• Not all material obeys Hooke's law. It is only valid for small deformation of elastic material. The material which obeys Hooke's law is called Hookean materials.
• Two materials that do not obey Hooke's law are rubber, plastic. This is so because every substance has an elasticity with an elastic limit.