Mechanical Properties of Solids Class 11 Physics

In this chapter, you will learn about Mechanical Properties of Solids in Class 11 Physics, an important topic for your board exams, JEE, and NEET preparation. Master the concepts with our free resources below.

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Chapter Notes

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Key Concepts

Elastic behaviour: Elastic behaviour: stress, strain, Hooke's law
Young's modulus, Bulk modulus, Shear modulus: Young's modulus, Bulk modulus, Shear modulus
Poisson's ratio: Poisson's ratio
Elastic potential energy stored in a wire: Elastic potential energy stored in a wire

Important Formulas

Stress:

Force/Area

Strain:

ΔL/L

Young's modulus:

Y = Stress/Strain

Energy stored:

½ × Stress × Strain × Volume

Solved Numerical Examples

Example 1

Problem: A wire of length 2 m and cross-sectional area 10^-6 m² is stretched by a force of 100 N. If the wire elongates by 1 mm, calculate the Young's modulus of its material.

Solution: Stress = F/A = 100 / 10^-6 = 10^8 N/m². Strain = ΔL/L = (10^-3) / 2 = 5 × 10^-4. Young's modulus Y = Stress / Strain = 10^8 / (5 × 10^-4) = 2 × 10^11 N/m².

Example 2

Problem: Calculate the strain energy stored in the above wire.

Solution: Energy U = ½ × F × ΔL. U = ½ × 100 × (10^-3) = 0.05 J.

Daily Practice Problems (DPP)

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Multiple Choice Questions (MCQs)

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Previous Year Questions (PYQs)

Review questions from past JEE and NEET exams for Mechanical Properties of Solids. Access all Physics PYQs here.

Common Mistakes

Forgetting to convert units appropriately.
Misapplying the sign convention.
Ignoring vector components in calculations.