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I was hoping someone could help me understand Hookes Law.

Hooke’s Law, states that Stress is proportional to Strain.

The bit I am struggling to understand is that Stress is F/A and Strain is Change in Length/Original Length, so if Stress is proportional to Strain then shouldn't F/A be proportional to Change in Length/Original Length???

I am getting confused because Hookes Law is given by the equation F=Kx, where F, is the force, K is a constant and X is the change in the length - How do you drive F=Kx from F/A and Change in Length/Original Length?

Can anyone help?

Thank you.