Answer: Spring constant
Explanation:
The stiffness of the spring is determined by its spring constant. It measured in Newtons per meter (N/m).
The spring resists change in its length- either being extended or compressed. It always tends to come back to its original position.
Hooke's law states that force F required to extend or compress a spring is directly proportional to its displacement x.
F ∝ x
F = k x
where, k is the spring constant.