The two quantities involved are related by the first Lame constant
Its discoverer and namesake initially published this law as a Latin anagram and two centuries later, Cauchy generalized it to three-dimensional bodies.  The two quantities involved are related by the first Lame constant, a constant represented by mu and known as the shear modulus, though in simpler terms this law can be expressed as "F equals negative k x."  FTP, name this law of mechanics that states that stress is directly proportional to strain, and was first used to describe the spring in springs.
Its discoverer and namesake initially published this law as a Latin anagram and two centuries later, Cauchy generalized it to three-dimensional bodies.  
Hooke's Law