Any chance you'd have this derivation available somewhere ?Well, I'd say the d'Alembert principle can be derived from the Hamilton principle, which is the fundamental principle of all contemporary physics. You could, of course, as well argue the other way around and take the d'Alembert principle as fundamental and derive Hamilton's from it (as is the tradition in many textbooks on analytical mechanics).
After going through the stackexchange link it seems to me that D'Alembert's principle is just a restatement of Newton's 2nd law.
What I understood is that this is true only in under certain conditions.After going through the stackexchange link it seems to me that D'Alembert's principle is just a restatement of Newton's 2nd law.
I find it peculiar as well. It seems it's useful to solve mechanic problems.Can one succintly describe the relevance of d'Alembert's principle ? I've taken two courses in classical mechanics (Newtonian and "analytical") and never heard of it. Since this bears no relevance to real theories of physics (electrodynamics, relativity, QM and QFT), I don[t understand why bring it in the first place...