Talk:Rigid body kinetics
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Should there be some mention of moment of inertia on this page? I'm not sure if a moment of inertia is a less general thing than the matrix of moments appearing here. Even so, it might be worth mentioning. -- WillWare 02:42, 22 September 2006 (UTC)
This page needs a lot of work.
- It doesn't say what rigid body dynamics is, it says what it is not.
- Rigidity implies non-deformation
- Instantaneous change of velocity upon impact
- Therefore no real bodies are rigid
- RBD is a mathematical idealization of electrostatic forces e.g. when steel balls collide, though real collisions take time and cause tiny deformation
- Painleve problem/static indeterminancy with friction
- Resting contact -> linear complementarity problem
- Methods of solution: impulse-based, constraint-based, projection methods
- Rigid-body interactions (collision, joints), constraint manifold
- holonomic/non-holonomic constraints, principle of virtual work
... As a non-expert but a reasonably smart guy with a basic understanding of calculus, I couldn't make heads or tails of this. When an expert does rewrite this page, please include a couple of paragraphs for the rest of us! Glancing at the kinematics page, it looks much more like an encyclopedia should. Thanks! 69.180.230.102 (talk) 18:44, 16 February 2008 (UTC)
[edit] This article is very basically incorrect
This article mixes kinetics with kinematics. See Goldstein: Classical Mechanics. Brews ohare (talk) 23:20, 2 May 2008 (UTC)
