Editing Nonholonomic system (section)

====Layperson's explanation====
Consider the wheel of a bicycle that is parked in a certain place (on the ground).  Initially the [[Valve stem|inflation valve]] is at a certain position on the wheel.  If the bicycle is ridden around, and then parked in ''exactly'' the same place, the valve will almost certainly not be in the same position as before. Its new position depends on the path taken. If the wheel were holonomic, then the valve stem would always end up in the same position as long as the wheel were always rolled back to the same location on the Earth. Clearly, however, this is not the case, so the system is nonholonomic.