12.01.2017, 13:58
(12.01.2017, 13:47)Sophie schrieb: Aktuell hätte man untersuchen können, warum es auf Glatteis so rutschig ist.Ich tippe ohne Untersuchung mal auf einen Reibungskoeffizienten von 0,0001.
Nein, er ist doch etwas höher.
Zitat:Water ice at temperatures not far below 0 °C is remarkable for low coefficients of around 0.05 for static friction and 0.04–0.02 for dynamic friction, but these figures increase as the temperature diminishes.
Und zwar vermutlich weil:
Zitat:Alternatively, and more likely, heat-softening of the ice may occur resulting in a thin, statistically homogeneous (in the lateral direction) layer of disordered ice, with a shear strength which decreases continuously as the ice surface temperature approaches the bulk melting temperature. This layer could be related to surface premelting of ice. Using a phenomenological expression for the frictional shear stress, I show that the calculated ice friction is in good agreement with experimental observations.