It is used to determine how 'fast' the ice is. The longer a rock stays in motion, the faster the ice. Or, better put, the longer a rock takes to travel between 2 points (the back line and the T-line in the rings), the faster the ice. It may seem counter-intuitive, but if the ice is slow, you have to throw the rock harder to reach the same distance, than if it is fast. If the ice is fast, you can let the rock go gently, and it will stay in motion for a longer time, reaching the same destination, but taking longer to do it.
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