Hooke's Law is a principle in physics that states that the force required to extend or compress a spring by some distance is proportional to that distance.
In Hooke's Law, two springs in series refer to two springs that are connected end-to-end in a straight line, with the same applied force acting on both springs.
The force applied to a spring in Hooke's Law directly affects its extension. The greater the force, the greater the extension of the spring.
The formula for calculating the force in Hooke's Law is F = kx, where F is the force, k is the spring constant, and x is the distance the spring is extended or compressed.
The spring constant, k, is a measure of the stiffness of a spring. A higher spring constant indicates a stiffer spring, while a lower spring constant indicates a more flexible spring.