A-level Physics/Forces and Motion/Deformation of solids
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,extention is directly propotional to the applied force.
The gradient refers to the gradient of a Tension-Extension graph.
The standard units of k are N m-1
Because this is a division of two measurements of length, Strain has no units and remains a ratio.
The units for Stress are N m-2, otherwise known as Pascals (Pa)
The Young's modulus
However, due to Hooke's Law, it can be calculated in another form;