It is a formula of which formulae is its plural.
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The equations of motions.
Scientific Law.
I'm guessing that you're talking about a Law of Physics. Laws are typically described using mathematical equations. Like newton's second law: F=ma (force=mass*acceleration) Theories, on the other hand are usually just a description or explanation of behavior, like how light can behave like a wave and a particle.
It could be termed a "law".
That would probably be something like a "physical equation".That would probably be something like a "physical equation".That would probably be something like a "physical equation".That would probably be something like a "physical equation".