Stress, Strain, Youngs Modulus

Question 0

When can hooke’s law not be applied?

Answer 0

The equation works as long as the elastic limit is not exceeded.

For example when a spring exceeds it’s elastic limit it will not return to its original shape.

Question 1

What is hooke’s law and what is it used for?

Answer 1

Force(N) = spring constant (N/m) x extension (m)

Used to calculate the spring constant of a material

Force is d.p. to extension

Question 2

What is the equation to calculate stress?

Answer 2

Stress(Pa) = force(N) / cross sectional area (m^2)