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Message:: [QUOTE="-jeffB, post: 15923809, member: 27832"]Not really. If the magnet and coin are both stationary, there's no force exerted. But if you move a strong magnet near a highly conductive metal object (or vice versa), they'll resist the movement. The thicker the metal, the more pronounced the effect. I have an old hard drive magnet assembly with a slot between two strong magnets, just the right size to pass a coin. Nickels drop through at a normal speed. Silver dimes fall slightly slower than clad. Quarters fall more slowly, halves even more slowly, and dollars slowest of all. The copper core of a clad coin is almost as conductive as silver, so the difference between clad and silver is less than you'd expect. But solid cupronickel is easy to distinguish. So is steel, of course, which just sticks. But the slowest coin I've ever tried is a small aluminum foreign piece. Relative to its weight, aluminum is more conductive than silver, and it absolutely crawls through the slot. Once the crises slow down, I should make a video...[/QUOTE]