This fact is from Mechanical Properties of Materials in Dental Materials. It is a commonly tested concept in NEET MDS examinations. Understanding this fact is crucial for answering MCQs correctly.
Stress = Force divided by Area = internal resistance
Strain = change in length divided by original length = deformation
Elastic modulus = Youngs modulus = stress divided by strain = stiffness
Toughness = total area under stress-strain curve
Resilience = energy absorbed in elastic region only
Hardness tests: Knoop for micro surfaces, Vickers universal, Brinell for macrosurfaces.