Full Idea
Physics must not just discover laws and causal explanations. In putting forward as comprehensive theories that recognise only a limited range of natural properties, physics proposes inventories of the natural properties instantiated in our world.
Gist of Idea
Physics discovers laws and causal explanations, and also the natural properties required
Source
David Lewis (New work for a theory of universals [1983], 'Min Mat')
Book Reference
'Properties', ed/tr. Mellor,D.H. /Oliver,A [OUP 1997], p.212
A Reaction
Physics does this job extremely well, offering things like force, spin, charge that are the building blocks for their theories. There is metaphysics at the heart of physics, unavoidably.