Chapter 22 of 36
Revision Notes
Elasticity — Revision Notes
JEE Mains · Physics
Free Elasticity revision notes for JEE Mains Physics 2026 — key concepts, formulas, and definitions for quick revision.
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Key concepts, formulas, and definitions from Elasticity for JEE Mains Physics preparation.
Key Topics to Revise
1
Introduction to Elasticity
- When external forces act on a body, two effects occur: deformation and development of internal restoring forces
- Elasticity is the property of materials to return to original shape after removing external forces
- Perfectly elastic body: completely returns to original shape
2
Stress and Strain
- Stress is internal restoring force per unit area (σ = F/A)
- Strain is change in dimension per unit original dimension (ε = Δx/x)
- Stress has dimensions [ML⁻¹T⁻²], same as pressure
3
Hooke's Law and Elastic Moduli
- Hooke's Law: For small deformations, stress ∝ strain
- Modulus of elasticity E = stress/strain
- Three types: Young's modulus (Y), Bulk modulus (B), Rigidity modulus (η)
4
Stress-Strain Curve
- Linear region: stress ∝ strain (Hooke's law applies)
- Proportional limit (P): end of linear relationship
- Elastic limit (E): maximum stress for complete recovery
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Key Concepts
Elasticity is the property of materialsStress (σ) is the internal restoringHooke's Law states that stressA graphical representation showing the relationshipWhen a material is deformed
Frequently Asked Questions
What topics are covered in Elasticity for JEE Mains?
Elasticity is an important chapter in JEE Mains Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Introduction to Elasticity, Stress and Strain, Hooke's Law and Elastic Moduli, Stress-Strain Curve.
How important is Elasticity for JEE Mains?
Elasticity is a frequently tested chapter in JEE Mains Physics. Questions from this chapter appear regularly in previous year papers. There are 57 practice questions available for this chapter.
How to prepare Elasticity for JEE Mains?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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