Desrtopa comments on Harry Potter and the Methods of Rationality discussion thread, part 7 - Less Wrong
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Even if the armor isn't weighing down on you though, it still has inertia, so you have to exert yourself to move the extra mass. Maintaining a wingardium leviosa on it might be more trouble than it's worth.
Magic'ed stuff may not have inertia. Remember the description of broomstick flight during the escape from Azkaban? Harry was surprised to have to deal with concepts like "inertia" again when using a rocket, as the broomsticks do away with such inconveniences.