When physicists try to formulate their theories, sometimes they need to assume the very existence of unobservable objects and conditions in order to build a structure, for instance in the case of kinetic theory. That's why metaphysics can not be excluded at all from physics, it is inherent to human mind and creativity.

Is metaphysics related to physics?

Metaphysics (meta means 'beyond') is the study of those things and phenomena that are beyond the physical realm. ... Physics is the science of the natural world, more specifically dealing with the matter, energy, space-time and fundamental forces that govern the physical world.

Do you need physics for metaphysics?

Metaphysics must always take full account of physics and should explain it. Chalmers' article illustrates the relationship. The problem of consciousness, the inscrutability of matter etc., must be taken into account and explained within a metaphysical theory if the theory is to be plausible and useful.