what the purpose of the brush in curling
Curling The curler can induce a curved path by causing the stone to slowly turn as it slides, and the path of the rock may be further influenced by two sweepers with brooms who accompany it as it slides down the sheet, using the brooms to alter the state of the ice in front of the stone. Sweeping a rock makes it curl less, and decreases the friction that slows the rock down. A great deal of strategy and teamwork go into choosing the ideal path and placement of a stone for each situation, and the skills of the curlers determine the degree to which the stone will achieve the desired result. This gives curling its nickname of "chess on ice".[3][4]
Curling at the Winter Olympics Curling was included in the program of the inaugural Winter Olympic Games in 1924 in Chamonix[1] although the results of that competition were not considered official by the International Olympic Committee until 2006. Curling was a demonstration sport at the 1932 Games, and then again after a lengthy absence in 1988 and 1992. The sport was finally added to the official program for the 1998 Nagano Games.