# CBSE Class 11 Physics Chapter 9 – Mechanical Properties of Solids Class 11 Notes

## Mechanical Properties of Solids Class 11 CBSE Revision Notes

Mechanical Properties of Solids Class 11 Notes â€“ First of all the chapter explains stress. Also, it tells that stress is the restoring force per unit area. On the other hand, the strain is the fractional change in dimension. Generally, there are three types of stresses namely: tensile stress, shearing stress, and hydraulic stress. Moreover, the tensile stress is further classified as longitudinal stress or compressive stress. In addition, for small deformation stress, is directly proportional to the strain for many materials. Most noteworthy, this is known as Hookeâ€™s Law and the constant of proportionality is the modulus of elasticity.

Elastomers are a class of solid that does not obey Hookeâ€™s Law. Moreover, when we apply a parallel pair of forces to a solidâ€™s upper and lower faces the solid deforms. Furthermore, the upper face of the solid moves sideways with respect to the lower face. Also, the horizontal displacement of the upper face is perpendicular to the vertical height. In addition, this deformation is known as shear and the stress is shearing stress. Besides, stress is not a vector quantity as unlike a force, stress cannot be assigned in a specific direction.

### Sub-topics covered under Mechanical Properties of Solids

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