Revision Notes for Class 11 Physics Chapter 9 - Mechanical Properties of Solids - Free PDF Download















FAQs on Mechanical Properties of Solids Class 11 Notes CBSE Physics Chapter 9 [Free PDF Download]
Question 1. Briefly Explain the Different Types of Strain.
Ans: Strain is defined as the change in the shape or size of the body after a deforming force is applied to the body.
Longitudinal Strain - Any change in the length of the body is defined as a longitudinal or tensile strain.
Strain = Change in length/Original length = △l/l
Volumetric Strain - If the deforming force brings about a change in the volume of the body it acts upon it is defined as the volumetric strain.
Strain = Change in volume/Original volume = △V/V
Shear Strain - The tilt in angle caused due to the tangential stress on the body.
Strain = θ = △L/L
Question 2. Explain Poisson’s Ratio.
Ans: Poisson’s ratio talks about the change in the width of the material to the change in the length of the material per unit width and length respectively. Mathematically it can be defined as the negative ratio of a transverse strain to longitudinal strain.
The change in the diameter of the body due to external force applied is the transverse strain and the change in the length of the body is a longitudinal strain.
Poisson’s ratio = σ = -Transverse Strain/Longitudinal strain
σ = -(△D/D)/(△l/l)