Topic 1 · pp. 128–132 · Free
Topic Notes · Easy summaries with diagrams
Chapter 6 — Chapter 6 — Mechanical Properties of Matter
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📘Easy summary
A deforming force changes size or shape. Elasticity: property of a solid to regain its original shape and size when the deforming force is removed. Hooke's law: within the elastic limit, extension is directly proportional to the applied force: F = kx, k = spring constant (N m⁻¹). Beyond the elastic limit the body is permanently deformed (not elastic). Extension of a wire ∝ L/A (∝ L/d²). Steel is more elastic than iron and rubber; springs are made of steel. Applications: spring balance, car suspension, weighing machines, mattresses.
⭐Key points
- Springs in series: extension adds, k decreases.
- In parallel: load shared, k increases.
🔬Diagram
🌿Real-life example
40 N stretches 20 mm: k = 2000 N m⁻¹.
💡Exam tip
- Mention 'within elastic limit'.
✅Quick check
1. Hooke's law:
2. Unit of k:
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