1.4.28 - Stress, strain and Young modulus

Understand how to use the relationships (tensile or compressive) stress = force/cross-sectional area (tensile or compressive) strain= change in length/original length Young modulus = stress/strain.

Use - stress, strain and young modulus to connect the rule to the data and decision in the question.

This matters because - stress, strain and young modulus determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - stress, strain and young modulus to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Stress, strain and Young modulus is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.