For 10 points, name this law usually written as F equals negative k x, which governs the motion of a mass on a spring.
Julian Smallwood noted a hysteresis-like departure from this law, which Voigt modified by adding higher order terms. The yield point represents the point at which this law no longer applies, and integration of this equation gives the dependence of potential energy on displacement. Young's modulus is the coefficient in this first-order approximation of the relationship between stress and strain.  For 10 points, name this law usually written as F equals negative k x, which governs the motion of a mass on a spring.
Julian Smallwood noted a hysteresis-like departure from this law, which Voigt modified by adding higher order terms.
{Hooke's} Law