The first question that must be answered is this: What is friction?

To put it simply friction is what happens when the uneven surface of a
substance “sticks” to any particle in contact with it. It is what allows you
to start skating, as well as slow down. You can think of it like Velcro.

If you have two pieces of Velcro, and you move them across eacother, they stick together. This is because the two surfaces have rough, uneven surfaces and when placed up against one another, momentarily connect groove to divot.  This same concept can be extrapolated to all particles in the world, including  air particles! That’s right, even air “sticks” together sometimes.  The friction of a surface depends greatly on the surface’s roughness, which is usually on the particulate level. For example, wood has a rough surface, but when you coat it with a level surface of varnish, it is more smooth, and therefore has a smaller coefficient of friction. Due to the fact that ice has a smooth surface, it has a relatively low coefficient of friction, thus there is very little “stuff” grabbing onto particles as they pass over the ice.   The amount of friction on ice can increase or decrease based on the temperature of the ice. The differences in ice quality cause the ice to be referred to as  either "fast ice” or "slow ice.”