What part of speech is “physical”

physical describes something that relates to the body or physical world, as opposed to the mental or spiritual realm.

1. I'm looking for a physical therapist who can help me with my back pain.

2. His physical strength was impressive.

3. Jenna chose to focus on physical education classes in college.

physical is used when referring to something tangible, so it should not be used when referring to abstract or intangible concepts.