It is the same as a force, not one for initiating motion but to stop it, otherwise known also as non-centralized resistance, friction, or viscosity. In any case, physical constraints actually reduce the number of degrees of freedom for all system they applied to.
They could be classified into external and internal constraints. These classifications become progressively more influential as the number of particles increases. However, usually, is the case, in classical dynamics, the internal constraints were ignored mostly in various critical analyses. This is more so in the theory of rigid bodies motion. Further classifications led to holonomic http://en.wikipedia.org/wiki/Holonomic , nonholonomic http://en.wikipedia.org/wiki/Nonholonomic_system , scleronomic, and rheonomic systems. For the sake of theoretical investigations, both gravity and electromagnetism could be fundamentally subjected to some sorts of long range external constraints, while weak and strong nuclear forces subjected to short range internal constraints. Now, however, all of these could be lumped into main effects of charge constraints. Gravity being dominated by the one and only gravitational charge (not the graviton but the theorized quantum of mass) Electromagnetism ruled by the interactions of positive and negative electric charge (no consensus exists as to what is the quantum of charge – even though the electron is considered as the lightest unit negative charge and the positron as the lightest unit positive charge). Weak force is described by combining gravity’s charge and electric charge constraints via Higgs mechanism, lastly, the three colored charge constraints for eight massless gluons of the strong nuclear force.
Surprisingly, the vacuum state exists with its charge constraints perfectly neutralized. Only by careful and meticulous experimental verifications could quantum vacuum fluctuations http://en.wikipedia.org/wiki/Quantum_fluctuation and quantum vacuum polarizations http://en.wikipedia.org/wiki/Vacuum_polarization become evident within very brief time interval, leading to a few successful results showing Casimir Effect http://en.wikipedia.org/wiki/Casimir_effect , Lamb Shift http://en.wikipedia.org/wiki/Lamb_shift , the states of positronium http://en.wikipedia.org/wiki/Positronium , and states of antihydrogen atom http://en.wikipedia.org/wiki/Antihydrogen . Nonetheless, further developments of complex antimatter: antihelium, antioxygen, anticarbon, etc, up to antiuranium appeared extremely difficult. The successful creation of complex antimatter could possibly await the discovery of negative gravitational charge constraints and the promise of limitless energy source from the vacuum depends upon a feasible process of transforming virtual particles into real particles permanently. Someone finding this process could also resolve the difficulty of hot and cold fusion research.


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