[xorxarle]

An example of this could be walking on a slippery surface, your shoes grip until a threshhold is reached where you slip and increased speed seems to reduce the friction. I imagine it like tiny bumps that repel the surface of the shoe so that there is less net contact. Or is that the second hypothesis in the article? The relationship between speed and friction is discussed here, also: https://physics.stackexchange.com/questions/29561/does-frict...