When an athlete throws curling, the trajectory of the throwing line can't achieve the ideal effect. Other athletes will brush the ice surface and adjust the curling path slightly by brushing the ice surface to achieve the ideal position.
The speed, route and even rotation speed of curling can be changed to some extent by the different speed and angle of ice brushing. The principle is that the ice brush rubs the ice surface quickly, and the ice surface will melt to form a water film to reduce friction. Of course, you can't brush too hard, the water film will thicken, and the surface tension will produce motion resistance.
Brushing the ice with an ice brush generates heat by friction with the ice surface, so that the ice surface melts, and an extremely thin water film is formed between curling and the ice surface, which separates curling from the ice surface and effectively reduces friction, thus achieving the purpose of controlling curling.