University Physics Volume 1

# Key Equations

### Key Equations

 First Equilibrium Condition $∑kF→k=0→∑kF→k=0→$ Second Equilibrium Condition $∑kτ→k=0→∑kτ→k=0→$ Linear relation betweenstress and strain $stress=(elastic modulus)×strainstress=(elastic modulus)×strain$ Young’s modulus $Y=tensile stresstensile strain=F⊥AL0ΔLY=tensile stresstensile strain=F⊥AL0ΔL$ Bulk modulus $B=bulk stressbulk strain=−ΔpV0ΔVB=bulk stressbulk strain=−ΔpV0ΔV$ Shear modulus $S=shear stressshear strain=F∥AL0ΔxS=shear stressshear strain=F∥AL0Δx$