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Grease reduces friction because the two original materials are no longer touching each other. If you have a piece of steel rubbing against another piece of steel then there is friction between them. If grease is on the surfaces then you have molecules of grease rubbing against other molecules of grease. Grease is slippery stuff as it has a very lowCoefficient of friction. Every material has a coefficient of friction but with steel it is quite high. Teflon is very very low. Proper name polytetrafluorethylene or ptfe.

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14y ago

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