Final answer:
Friction in ice-skating is reduced due to almost liquid water layers on the ice surface induced by friction, offering smooth gliding and challenging conditions below -7°C.
Explanation:
Friction reduction in ice-skating is primarily due to the presence of almost liquid water layers on the surface of ice, combined with melting induced by friction as a skater moves forward.
This phenomenon enables skaters to glide smoothly. The friction reduction isn't based on the traditional hypothesis of pressure-induced melting of ice under the blade.
Skating becomes more challenging at temperatures below -7°C when the number of lubricating water layers decreases, affecting the ease of gliding.
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