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... there is friction. Just
estimating the frictional force at 10 N for convenience I get 10 J of work or
2.4 cal for every m the skate slides. This will melt 0.03 cc of water which
will create a film of water 1 mm X 0.03mm X 1 m. Reduce the force, widen my
blades or whatever and you still get a very substantial film of water.