Question

Robert Hooke discovered experimentally that within elastic limit

1.

stress = strain

2.

stress/strain = a constant

3.

stress × strain = 1

4. None of these

Answer 1

Correct Answer - Option 2 :

stress/strain = a constant

Concept:

• Stress: Stress is the ratio of the load or force to the cross-sectional area of the material to which the load is applied.
  • The standard unit of stress is N/m2.
• Strain: Strain is a measure of the deformation of the material as a result of the force applied.
  • The strain is a unitless quantity.
• Hooke's law states that within the elastic limit the stress applied on a body is directly proportional to strain produced.

⇒ Strain ∝ Stress

⇒  Stress = E × Strain  (Where E = modulus of elasticity)

i.e. stress/strain = a constant

• Hooke's law is important because it helps us understand how a stretchy object will behave when it is stretched or compacted.