Metaphysics is also linked to the world of parapsychogy, (e.g.) the investigation of telepathy. Similar in nature, some like to use the words interchangeably, but metaphysics takes it own shape and form. Supernatural happenings and miracles merge with metaphysics, as well, and are usually classified under the subject.
But no man, having seen only one body move after being impelled by another, could infer that every other body will move after a like impulse. All inferences from experience, therefore, are effects of customs, not of reasoning.