In 1948, Kurt Lewin published a book called Resolving Social Conflicts. And in that book he applies a simple concept from mechanical physics to describe how social equilibrium works. I’m sure you are all familiar with ‘for every force there is an equal and opposite force’. It is Newton’s third law of motion.
Kurt Lewin basically said that this can also be applied to society. That there are driving forces of progress, and those are opposed by restraining forces or obstacles to change. When these things are in balance, then you have equilibrium, or the status quo. And when the driving forces are greater than the resistance, you see change.
He created a system for identifying and quantifying this and he called that Force Field Analysis.