física

In a sentence

• La física es una de las ciencias fundamentales.

  Physics is one of the fundamental sciences.

  Here, the word 'física' is used as a noun to refer to the natural science of physics, which studies matter, its motion, and its behavior through space and time.

• Ella tiene una condición física excepcional.

  She has an exceptional physical condition.

  In this sentence, 'física' is used as an adjective to describe the word 'condición' (condition), referring to the physical state of the body.

• Estoy interesado en mejorar mi bienestar físico mediante el ejercicio.

  I am interested in improving my physical well-being through exercise.

  Here, 'físico' (masculine form due to matching with 'bienestar') is used as an adjective, qualifying 'bienestar' (well-being), to specify it concerns the physical aspect.