Define stress and strain?

Define stress and explain the types of stress.

Define stress, strain and Young's modulus of an elastic material. Describe an experiment for measuring the Young's modulus of a material in the form of a wire.

Figure shows graph between stress and strain for a uniform wire at two different temperatures. Then

STATEMENT - 1 : The value of modulus of elasticity depends on the magnitude of the stress and strain and STATEMENT - 2 : A given material have different moduli of elasticity depending on the type of stress applied.

Statement-1 : The value of moduli of elasticity is directly proportional to stress. Statement-2 : The value of moduli of elasticity is inversely proportional to strain. Statement-3 : The value of moduli of elasticiy is independent of magnitude of stress and strain.

Assertion: Ratio of stress and strain is always constant for a substance. Reason : This ratio is called modulus of elasticity .

The stress and strain graphs for two materials, A and B are shown here. Answer the following :give reasons

Assertion : For small deformations, the stress and strain are proportional to each other. Reason: A class of solids called elastomers does not obey Hooke's law.

Stress & Strain

A metalic cube whose side is 10cm is subjected to a shearing force of 100 N. The top face is displaced through 0.25cm with respect to the bottom . Calculate the shearing stress, strain and shear modulus.