Get the concept of: Hooke's law, coefficient of stiffness of the springs, elastic limit, elastic hysteresis, elastic recovery.
Experiment: It checks the validity of Hooke's law for two spiral springs with different stiffness springs. Using weights studied phenomenon stretching spiral spring, depending on the deforming force. The experience is repeated with a rubber band, for which there is no proportionality between the current force and deformation.
