Class 11 Physics — Chapter 1: Mechanical Properties of Solids

What you'll learn

• ▸Elasticity and Plasticity
• ▸Stress and Strain
• ▸Hooke's Law
• ▸Stress-Strain Curve
• ▸Key Points on the Stress-Strain Curve
• ▸Young's Modulus (Y)
• ▸Ductile and Brittle Materials
• ▸Elastomers

Chapter Summary

--- PAGE 1 --- CHAPTER EIGHT MECHANICAL PROPERTIES OF SOLIDS 8.1 Introduction 8.2 Stress and strain 8.3 Hooke's law 8.4 Stress-strain curve 8.5 Elastic moduli 8.6 Applications of elastic behaviour of materials Summary Points to ponder Exercises 8.1 INTRODUCTION In Chapter 6, we studied the rotation of the bodies and then realised that the motion of a body depends on how mass is distributed within the body. We restricted ourselves to simpler situations of rigid bodies. A rigid body generally means a hard solid object having a definite shape and size. But in reality, bodies can be stretched, compressed and bent. Even the appreciably rigid steel bar can be deformed when a sufficiently large external force is applied on it. This means that solid bodies are not perfectly rigid. A solid has definite shape and size. In order to change (or deform) the shape or size of a body, a force is required. If you stretch a helical spring by gently pulling its ends, the length of the…

Practice Questions from this Chapter

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1. Explain how buildings resist forces. Get Solution →
2. Show elasticity in bouncy balls. Get Solution →
3. List strongest materials in nature. Get Solution →
4. What is the property of a body by virtue of which it tends to regain its original size and shape when the applied force is removed? Get Solution →
5. For small deformations, Hooke's Law states that stress is directly proportional to what? Get Solution →
6. According to the text, which property is demonstrated by substances like putty or mud that get permanently deformed? Get Solution →
7. What is the unit of Young's modulus? Get Solution →
8. How is volume strain defined in the text? Get Solution →

Did you know?

• 💡 Rubber bands can stretch up to 600% of their original length before breaking.
• 💡 Spider silk is stronger than steel by weight, making it incredibly tough.
• 💡 One ounce of gold can be stretched into a wire 50 miles long.
• 💡 Shape-memory alloys return to their original shape when heated, even after bending.
• 💡 Diamonds are hard but can shatter if hit precisely, unlike tough materials.

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