Explain stress and strain with a simple example
The short version: stress and strain refers to the internal force per unit area and the resulting relative deformation. A quick example makes it concrete — A steel rod under 10 kN over 100 mm² carries a stress of 100 MPa.
How to approach it step by step
Once one example makes sense, the method generalises: apply σ = F/A and ε = ΔL/L, then relate them through Young's modulus. In a visual interactive session the example is built on screen piece by piece, so you see which quantity changes at each step instead of only reading a final answer. Ask for a harder variant and the explanation adapts on the spot.
Worked example
A steel rod under 10 kN over 100 mm² carries a stress of 100 MPa.
The mistake most learners make
Using the deformed area instead of the original area for engineering stress.
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