What is Hooke's law?
Hooke's law is a law of physics that states that the force needed to extend or compress a spring by some distance scales linearly with respect to that distance
Tensile Stress
Tensile stress is the force applied per unit area, increasing a body`s length (or area).
- σ : Tensile stress (Pa)
- F: Force acting(N)
- A: cross-sectional area (m2)
Tensile Strain
Tensile strain is the amount of deformation experienced by the body in the direction of force applied, divided by the intial dimensions of the body.
Young`s Modulus
Young`s Modulus is a measure of mechanical properties of linear elastic solids like wires. It describes the relationship between stress and strain deformation in an object.
- Young`s Modulus (Pa or Nm-2)
- σ: Tensile Stress (Pa)
- ε: Tensile Strain
EXAMPLE
A string 4mm diameter has original length of 2m. The string is pulled by a force of 200N. If the final length of the spring is 2.02m, determine:
(a) Stress
(b) Strain
(c) Young`s modulus
