Practice portal › Mechanical Properties of Solids › Stress, Strain and Hooke's Law
Asked in NEET 2023 · Stress and strain
Given: a wire hanging from a rigid support with a weight W at its lower end, cross-sectional area A.
Idea: take an imaginary horizontal cut anywhere in the wire and ask what force the material across that cut must carry.
Everything below the cut is in equilibrium under its weight W (the wire itself is taken as light) and the tension T from above.
T=W at every cut, so the tension is the same all along the wire.
Longitudinal stress is the normal force per unit area of that cut: σ=T/A.
σ=W/A
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