**Stress, Strain and Hooke's Law - Lesson - TeachEngineering**
https://www.teachengineering.org/lessons/view/van_cancer_lesson2

Replacing force with a measure of stress and displacement with a measure of strain, the following expression may be obtained, σ = E* ε. We will now explore the measures of stress and strain. Stress is a measure of average force per unit area, given by σ = F/A where average stress, σ, equals force, F, acting over area, A.

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