This paper addresses the coefficient of kinetic friction of relatively warm ice (-50 °C) sliding slowly (＜1 m s~(-1)) over itself and presents physical models to account for two characteristics: velocity-strengthening at lower speeds and velocity-weakening at higher speeds. The models are based upon a combination of creep deformation within a near-surface zone and frictional heating cum localized melting of asperities that protrude from opposing surfaces. Both freshwater ice and saltwater ice are addressed. The paper closes with a comment on the role of friction on brittle compressive failure.
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