Hooke's law
This applies to an object's deformation only before the elastic limit; from then on it deforms plastically and no longer follows this law. it states that, extension is directly proportional to the applied force.
Spring Constant
The gradient refers to the gradient of a Tension-Extension graph.
The standard units of k are N m−1
Strain
Because this is a division of two measurements of length, Strain has no units and remains a ratio.
It can also be represented as
Stress
The units for Stress are N m−2, otherwise known as Pascals (Pa)
The Young's modulus
Strain energy
However, due to Hooke's Law, it can be calculated in another form, y=mx+c;
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Elastic limit
the maximum extent to which a solid may be stretched without permanent alteration of size or shape.
Plastic limit
When the stress is sufficient to permanently deform the metal, it is called plastic deformation.