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Introduction

Elasticity in...

Question

Elasticity in solids is caused by

A

stress

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B

applied deforming force

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C

inter molecular forces

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D

elastic forces

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Solution

The correct option is C inter molecular forces
Elasticity is a property of matter due to which it regains its original configuration when the deforming force is removed.
All the three states of matter i.e. solid, liquid and gas exhibit elasticity. If the object perfectly regains its original shape and size after removal of a deforming force, it is said to possess perfect elasticity and is caused by inter molecular force.

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Q. Elasticity: The atoms in solids are held together by interatomic forces.The average locations of the atoms in a lattice do not change with time.Since the atoms are almost lacking in mobility, their kinetic energy is negligibly small. It is this lack of mobility which makes a solid rigid. This rigidity is the cause of elasticity in solids. In some solids such as steel, the atoms are bound together by larger inter-atomic forces than in solids such as aluminum. Thus, the elastic behavior varies from solid to solid. Even fluids exhibit elasticity. All material bodies get deformed when subjected to a suitable force. The ability of a body to regain its original shape and size is called elasticity. The deforming force per unit area is called stress. The change in the dimension (length, shape or volume) divided by the original dimension is called strain. The three kinds of stress are tensile stress, shearing stress, and volumetric stress. The corresponding strains are called tensile strain, shearing strain and volume strain. According to Hooke's law, within the elastic limit, stress is proportional to strain. The ratio stress/strain is called the modulus of elasticity.
The figure shows the strain-stress graphs for materials A and B. From the graph it follows that:

Q. Assertion (A): Stress is restoring force per unit area.
Reason (R) : Interatomic forces in solids are responsible for the property of elasticity

Q. Elasticity in the material is due to _______.
1. The change or effective radius of the molecules.
2. The change in intermolecular distance and restoring forces starts acting on the molecules.
3. The deforming forces acting on it.
Which option is true?

Q. The elastic potential energy of a body is ________.
1. Work done by the external force against the deforming force.
2. Work done against the external force by the deforming force.
3. The sum of work done by the external force and the deforming force.
Which one option is true?

Q. State whether true or false :
The property of an elastic body by virtue of which its behaviour becomes less elastic under the action of repeated alternating deforming force is called elastic fatigue

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