Mechanical Properties of Solids Class 11 Physics Notes – Formulas & Quick Revision

Elasticity ka chapter — stress, strain, Youngs modulus aur stress-strain curve. Chhota chapter, full-marks scoring. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.

Important Formulas & Concepts — Mechanical Properties of Solids

• Stress = F/A; Strain = ΔL/L
• Hookes law: stress ∝ strain (elastic limit tak)
• Youngs modulus Y = FL/(A·ΔL)
• Bulk modulus B = −ΔP/(ΔV/V); compressibility = 1/B
• Shear modulus (rigidity) η = shearing stress/shearing strain
• Poissons ratio σ = lateral strain/longitudinal strain
• Elastic PE per unit volume = ½ × stress × strain
• Thermal stress = Y·α·ΔT

Quick Revision Points

• Stress-strain curve: proportional limit → elastic limit → yield point → fracture
• Steel rubber se zyada elastic hai (Y zyada)
• Liquids/gases ka sirf Bulk modulus hota hai
• Wire ki elongation ΔL ∝ L/r² (same material)
• 1-marker + numerical dono format mein aata hai

FAQ

Ye chapter kitne marks ka hai?

Boards mein 4-5 marks. Kam padho, pura scoro — perfect ROI chapter.

Complete notes mein kya hai?

Stress-strain curve ka labelled visual, saare moduli ki comparison table aur solved numericals.

Explore more: free sample notes, free calculators aur interactive simulators.