Mechanical properties of Solids class 11 – CBSE JEE NEET | One Shot | Chapter 9

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0:00 Introduction
0:39 Mechanical Properties of solids
2:24 Elasticity & Plasticity
4:59 Mechanical Properties of solids: Significance
5:57 Stress & Strain
10:18 Stress
10:24 Types of Stress
15:44 Strain
17:11 Types of Strain
18:47 Hooke’s Law
20:23 Stress- Strain curve
26:35 Modulus of Elasticity
27:40 Young’s Modulus of Elasticity
28:18 Young’s Modulus of Elasticity: Units
31:59 Young’s Modulus of Elasticity: Importance
33:23 Value of Young’s Modulus of Elasticity
36:22 Problem 1
38:32 Problem 2
43:55 Bulk Modulus
46:07 Compressibility
47:33 Applications of Elastic Behaviour
48:56 Applications:Crane
52:59 Applications: Pillars in Buildings
54:12 Applications: Bridge

Mechanical Properties of solids describe characteristics such as their strength and resistance to deformation. Elasticity is a property by virtue of which original shape is regained once the external force is removed. Plasticity is reverse of elasticity, Property means permanent deformation. Property of being drawn into thin wires or sheets. Stress is the restoring force per unit area. Whenever we apply an external force on the body to change its shape there is a restoring force that develops in the body in the opposite direction. Longitudinal stress is defined as restoring force per unit area when the force is applied to the cross-sectional area of the cylindrical body. Tensile stress is a longitudinal stress when the length of the cylinder increases. Compressive stress is a longitudinal stress where the force is applied to compress the cylinder. Restoring force per unit area when the force applied is parallel to the cross sectional area of the body. Hydraulic stress is the restoring force per unit area when force is applied by a fluid on the body. Strain is a measure of deformation representing the displacement between particles in the body to a reference length. Change in length to the original length of the body due to the longitudinal stress. Hooke’s law states that within the elastic limit, stress developed is directly proportional to the strain produced in a body. Young’s modulus is the ratio of longitudinal stress to longitudinal strain. Shear modulus is defined as shearing stress to shearing strain. Bulk modulus is the ratio of hydraulic stress to the corresponding hydraulic strain.
In this videos we will cover:-
1. The stress-strain graphs for materials A and B are shown in.(a) Which of the materials has the greater Young’s modulus?
(b) Which of the two is the stronger material?
2.Two wires of diameter 0.25cm, one made of steel and the other made of brass are loaded as shown. The unloaded length of steel wire is 1.5 m and that of brass wire is 1.0 m. Compute the elongations of the steel and the brass wires.
3.How thick the rope should be depends on lifting capacity of the crane.
4.NCERT solutions class 11 physics mechanical properties of solids
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