Elasticity
Elasticity: Overview
This topic explores the applications of elasticity. The body appears to regain its original shape and size when external forces acting on it is removed. This property is called elasticity.
Important Questions on Elasticity
Two wires of different materials are suspended from a rigid support. They have same length and diameter and carry the same load at the free ends. Will extension, strain and stress be different?
Draw stress strain curve for a loaded steel wire and hence define the term permanent set, elastic limit, yield point and tensile strength.
Define elasticity. When a body is called elastic and when is it called plastic? Explain elastic limit.
Define young’s modulus of elasticity, normal stress and longitudinal strain. Give unit of each of them. Derive an expression for the elastic potential energy of a wire, when stretched.
Derive an expression for the elastic potential energy stored in a stretched wire under stress. Define the terms elastic after effect and elastic fatigue.
Steel is more elastic than rubber. Explain why?
Elasticity has different meaning in physics and in our daily life. Comment.
A wire stretches by a certain amount under a load. If the load and radius both increased to four times, find the stretch caused in the wire.
Distinguish between elasticity and plasticity.
What is an elastomer?
An elastic wire is cut to half its original length. How would it affect the maximum load that the wire can support?
What is the main factor on which modulus of elasticity of material depends?
What are the types of modulus of elasticity?
Why springs are made of steel and not of copper?
