Revision Notes for Class 11 Physics Chapter 9 - Mechanical Properties of Solids - Free PDF Download
The notes of mechanical properties of solids class 11 are available on Vedantu in PDF format and students can download it for free. Mechanical properties of Solids come under Unit VII- Properties of Bulk Matter. This entire unit is very important from an examination point of view and carries a total weightage of 20 marks.
This chapter talks about various laws and concepts around solid bodies. The chapter is theoretically dense, so to memorize them well students should understand the concepts first. To strengthen the understanding, physics class 11 chapter 9 notes include examples to explain the concepts clearly and logically. Students are advised to go through the notes of mechanical properties of solids class 11 regularly to maximize retention of the concepts and examples.
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)