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Define stress and strain....

Define stress and strain.

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The force per unit area is called as stress.
Stress, `sigma = ("Force")/("Area") = (F)/(A)`
The fractional change in the size of the object, when a force is applied, strain measures the degree of deformation.
Strain, `epsilon = ("change in size")/("original size") = (Delta l)/(l)`
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Knowledge Check

  • According to Hooke's law of elasticity, if stress is increased, the ratio of stress to strain:

    A
    increases
    B
    decreases
    C
    become zero
    D
    remains constant

  • According to Hooke's law of elasticity, if stress is increased, the ratio of stress to strain:

    A
    increases
    B
    decreases
    C
    become zero
    D
    remains constant

  • In steel, the Young's modulus and the strain at the breaking point are 2 xx 10^(11) Nm^(-2) and 0.15 respectively. The stress at the breaking point for steel is therefore……………. .

    A
    `2 xx 10^(8) Nm^(-2)`
    B
    `3 xx 10^(10) Nm^(-2)`
    C
    `3 xx 10^(12) Nm^(-2)`
    D
    none of these

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