. "L is a spring length, x is the horizontal component of the spring length L, y is the vertical component of the spring length L, FL is the total net force applied to the spring when a load is placed on it, Fx is the horizontal component of FL, Fy is the vertical component of FL, Li is the spring length without any load applied (FL=0), dL is the change in the spring length as a load is applied, K is" . . .