The spring constant k is a measure of how stiff the spring is, and is measured in units of newtons per meter (N/m). In this case one may approximately model the force as a ...The spring constant k is a measure of how stiff the spring is, and is measured in units of newtons per meter (N/m). In this case one may approximately model the force as a spring force with an "effective spring constant" k, and allow at least an approximate answer to what might otherwise be a difficult problem.
