I remember it as being the "Law of Gravity." Parachutist know this as "terminal velocity." Nothing theoretical about that.
Flat earth was a theory as is the "Big Bang."
That's what they call it a theory for some reason or another.
Yes, a law of gravity states that two objects with mass will accelerate (fall) towards each other. Why do they? That's explained by the Theory of Gravity.
Theories explain the why and how of a scientific law, like the above law of gravity. Indeed, theories can be disproved, just as all flat earth theories (hypothesis actually) have been disproved. Just let me know when someone wins the Nobel Prize in Physics for disproving the Big Bang Theory, or in Biology for disproving the Theory of Evolution. That will be big news!
"In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of the phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.
The University of California, Berkley defines a theory as "a broad, natural explanation for a wide range of phenomena. Theories are concise, coherent, systematic, predictive, and broadly applicable, often integrating and generalizing many hypotheses."
Any scientific theory must be based on a careful and rational examination of the facts. Facts and theories are two different things. In the scientific method, there is a clear distinction between facts, which can be observed and/or measured, and theories, which are scientists’ explanations and interpretations of the facts.
An important part of scientific theory includes statements that have observational consequences. A good theory, like Newton’s theory of gravity, has unity, which means it consists of a limited number of problem-solving strategies that can be applied to a wide range of scientific circumstances. Another feature of a good theory is that it formed from a number of hypotheses that can be tested independently."