The standard book about Newton's life is Never at Rest by Richard Westfall.
On my opinion it is a very good book, it covers his life in great detail, and gives a general overview of his activities (not only in physics) but in astronomy, history, theology, alchemy, and as the Mint administrator. On physics, the latest English translation of Principia by Cohen (UCB Press, blue cover, not the cheaper editions!), has very comprehensive introduction and commentaries, (Introduction is about 1/3 of the total size of the book!) which covers all aspects of Principia (and Principia contains Newton's most important contributions to physics). I do not know an equally good commentaries on his Optics.
"Newton's Principia for the common reader" by S. Chandrasekhar, written by one of the famous physicists of 20th century. This is a commentary to the first part of Principia.
" Huygens and Barrow, Newton and Hooke" by V. Arnold, is a very interesting (and very small) book written by a prominent mathematician. It explains very much of Newton's physics for a book of such small size.
I listed only my favorite general books. There is an enormous specialized literature (books and articles) on various aspects of Newton's physics, for example, on his derivation of Kepler's laws, on his theory of the Moon, on the theory of motion in resisting medium, on tides, on optics etc. The books listed above give a good general overview.