Mechanical Properties of Solids — Class 11 CBSE Physics revision notes
A 5-page visual revision sheet for Mechanical Properties of Solids, written for Class 11 CBSE Physics. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
Page 1 as PDF
Mechanical Properties of Solids in one look
push, pull, or twist it, and it stretches back to tell you how stiff it is
Stress and strain
- a solid is deformable: a force changes its shape or size
- elastic: it regains its shape once the force is removed
- stress is the restoring force per unit area, N/m^2 or Pa
- same dimensions as pressure, but a stress acts inside the body
- strain is the fractional change, no units
Three kinds of stress and strain
| Type | Stress | Strain |
|---|---|---|
| Longitudinal | F/A along the length | Δ L / L |
| Shearing | F/A along the face | Δ x / L = tanθ |
| Volume | pressure change Δ P | Δ V / V |
Shear and all round pressure
- shear: a force along the top face, the foot held
- the block leans through θ, and for small θ the strain is the angle
- all round: the same pressure on every face, shape unchanged
- the volume shrinks, and the volume strain is Δ V / V
Hooke's law
- within the elastic limit, stress is proportional to strain
- stress = modulus × strain, the modulus is the constant
- for a wire or a spring, the stretch is proportional to the load
- so the load stretch graph is a straight line through the origin
- unload it and the hanger comes back
Page 1 of 5. The full sheet, all 5 pages, opens free in the app.
What this Mechanical Properties of Solids sheet covers
- Stress and strain
- Three kinds of stress and strain
- Shear and all round pressure
- Hooke's law
- The stress strain curve
- Ductile, brittle, elastomer
- Ductile
- Brittle
- Elastomer
- Young's modulus
- longitudinal stress over longitudinal strain
- extension of a wire under load
- unit, the same as stress
- Reading Searle's apparatus
- Shear modulus, bulk modulus, Poisson's ratio
- shear modulus, shear stress over shear strain
- bulk modulus, pressure change over volume strain
- compressibility
- Poisson's ratio, lateral over longitudinal strain
- Bulk modulus: solid, liquid, gas
- Moduli in the limits
- Strain energy
- energy stored in a stretched wire
- energy per unit volume
- in terms of Y and strain
- Energy goes round
- Uses of elasticity
- sag at the middle of a bar of breadth b and depth d
- least rope area for a load W and a safety factor
- stress at the base of a mountain of height h
- Bridges and cranes
- Why mountains stay low
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Physics chapter by chapter against your real exam dates and free hours, and when the plan reaches Mechanical Properties of Solids the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.