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Elasticity

Change in the...

Question

Change in the shape of a body caused by the application of a force (stress) is called as :

A

ductility

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B

deformation

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C

hardness

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D

rigidity

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Solution

The correct option is A deformation
If a force on a body changes the normal positions of the molecules of a body, resulting in a change in the configuration of the body, then the force applied is called deforming force and change in shape of the body is called deformation.

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Q. Change in shape of a body caused by the application of stress is called:

Q. Force produces a change in the shape of the body without changing its volume, strain produced is called what the (longitudinal strain ,shearing strain, volumetric strain, normal stress? Give reason

Q. If by applying a force, the shape of a body is changed, then the corresponding stress is ________.

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:

A force acting on a body doesn't produce motion in it but causes a change in its shape. What kind of force is it?

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