Subjects/Basic Physics/Equilibrium and elasticitySection 9Equilibrium and elasticityFirst equilibrium conditionCopy LaTeX∑F=0View detail →Second equilibrium conditionCopy LaTeX∑τ=0View detail →Normal stressCopy LaTeXσ=AF⊥Unit: Pa.View detail →Longitudinal deformationCopy LaTeXε=L0ΔLdimensionless.View detail →Young's modulusCopy LaTeXY=εσ=AΔLF⊥L0linear elastic regime.View detail →Shear stressCopy LaTeXτcort=AF∥View detail →Shear modulusCopy LaTeXGs=Δx/hF∥/AView detail →Bulk modulusCopy LaTeXB=−ΔV/V0ΔPView detail →