Briefly stated, this category is about the branch of physics, the classical mechanics, concerned with the motion of physical bodies (kinematics), and with the forces that cause, or limit, these motions, as well as with forces which such bodies may, in turn, give rise to (dynamics). Thus the term "body" needs to stand for a wide assortment of objects, including particles, projectiles, spacecraft, stars, parts of machinery, parts of solids, parts of fluids (gases and liquids), etc.
More information