Why skates go only on ice?
Any child will tell that a floor not such slippery and firm as ice – therefore skates do not go. But there are also slippery coverings, and skates all the same "protest". So in what business?
Appears, when driving ice begins to thaw. It occurs at the expense of pressure put by edges upon a skating rink surface. Between ice and skates the imperceptible sheet of water is formed. Also there is no this layer, you could never pass on ice. Effect of water in this case is similar to effect of oil in the car – it reduces friction between the fad and a surface. we Will notice
that the movement of glaciers happens for the same reason. The lower ice layers begin to thaw – and here the ice river already slides on a mountain slope, sweeping away everything on the way.