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Elastic Properties of solids

NIOS · Class 12 · Physics

Quick revision notes for Elastic Properties of solids — NIOS Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

45 questions38 flashcards5 concepts

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A labeled diagram illustrating the four main types of stress (tensile, compressive, shear, and hydraulic) acting on a solid body, showing the direction of applied forces and the resulting internal res
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Key Topics to Revise

1

Molecular Theory of Matter and Intermolecular Forces

  • All matter is made of atoms and molecules held together by intermolecular forces.
  • At equilibrium separation R₀ (≈ 10⁻¹⁰ m for solids), the net intermolecular force is zero.
  • When R > R₀: attractive force acts between molecules.
2

Elasticity, Elastic and Plastic Bodies

  • Elasticity is the property of matter to regain its original shape and size after removal of the deforming force.
  • Perfectly Elastic Body: regains original state completely on removal of deforming force. Example: Quartz fiber (nearest to perfectly elastic).
  • Perfectly Plastic Body: does not regain original shape at all. Example: Ordinary putty (nearest to perfectly plastic).
3

Stress — Definition, Types and Formula

  • When a deforming force is applied, internal restoring forces develop inside the body that oppose the deformation.
  • Stress = Internal Restoring Force per unit area of cross-section.
  • At equilibrium, restoring force = deforming force in magnitude (but opposite in direction).
4

Strain — Definition, Types and Formula

  • Strain is the change in dimension per unit original dimension of a body due to deforming force.
  • Strain is a DIMENSIONLESS and UNITLESS quantity (ratio of two similar quantities).
  • Three types of strain correspond to three types of stress: Linear Strain, Volume (Bulk) Strain, and Shearing Strain.

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Full Notes

Key Concepts

All matter is made upElasticity is the property ofWhen a deforming force is appliedStrain is defined as the ratioWhen a metallic wire is loaded

Frequently Asked Questions

What are the important topics in Elastic Properties of solids for NIOS Class 12 Physics?
Key topics in Elastic Properties of solids include Problem-Solving Approach for Numerical Problems in Elasticity, Elastic Properties of Solids — Complete Concept Map, Elastic Properties of Solids — Complete Concept Map. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Elastic Properties of solids — NIOS Class 12 Physics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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