The second plays the third and fourth stones. The third plays the fifth and sixth stones and the fourth plays the last two stones. In mixed doubles, both teams play five stones each. One player plays the first and fifth stones while the other player plays stones two, three and four.
A sheet of curling ice is over 45 metres long and a maximum of five metres wide. At each end of the sheet there are two circles that look like target, known as houses. Each house consists of four rings which help define which curling stones are closest to the centre, commonly known as the Button.
A team scores one point for each of its own stones located in or touching the house that are closer to the centre than any stone of the opposite team. Only one team can score in an end. This is called a blank end. The teams take it in turns to deliver their stones from the Hack at one end of the sheet to the house at the opposite end. Players must release the stone before the Hog Line for the stone to be considered in play.
Stones which do not pass the hog line at the scoring end of the sheet are removed from play. When an end is complete, the next end is played in the opposite direction. After all stones have been delivered to the scoring end of the sheet, the players themselves calculate the score. Curling is played over ten ends, however in some formats and competitions this may be reduced to eight ends. Teams can concede their game earlier than the defined number of ends according to the rules of the competition.
The teams with the most points at this stage wins the game. Before a game of curling begins, teams decide who will have what is called the Hammer or Last Stone Advantage. In championship curling this is decided by a draw to the button with two players from each team delivering a stone as close as possible to the centre of the house — one stone is delivered clockwise and the other counter-clockwise — and the distance from the stone to the centre being measured.
If a team has the last stone advantage, it means they can deliver the final stone of an end and have an advantage to score at least one point and potentially win that end. When a team scores, they lose the last stone advantage and the hammer passes to the opposing team for the next end.
Teams generally try to score more than a single point in an end and will, therefore, sometimes blank an end, ensuring that no stones are lying in the house after the last stone is played. This means they get to keep the hammer for the next end. It seems like everyone and their brother has struggled with this nagging foot pain.
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Preparing For Your Visit. Our Story. Make A Payment. Specialized Rehab Equipment. Points are scored based on distance from the house, and at the end of the game, the team with the most points wins. Mark Shegelski , a professor of physics at the University of Northern British Columbia, who has also published several scientific papers on the physics of curling, helps us to break down the science of the game.
Friction or a lack of friction is what influences the motion of the curling rock. Friction is a force that's created when two surfaces move across each other in this case the stone and the ice and it always opposes the directional motion of the moving surface in this case the rock.
Friction is also dependent on the texture of both surfaces. The ice is slippery, but it still has friction that acts to slow the rock down. As the rock slows down, it gets deflected, or curls, in one direction. If the rock is rotating counter-clockwise, it will curl to the left. If it is rotating clockwise, it will curl to the right.
But the opposite happens in curling due to another phenomenon. Shegelski believes that the high pressure warms the ice more in the front, which creates a very thin, liquid film. The melted ice acts as a lubricant to reduce the force of friction at the front of the rock.
The friction at the front of the stone, which is exerted to the right, is now less than the friction at the back, which is to left, so the rock curls left.
Curling is not played on smooth ice used for sports like bobsledding or skating. Instead the surface has little bumps, called "pebbled" ice, made by spraying tiny droplets of water on the ice that freeze. The curl is too much on smooth ice, making it hard to herd the stone toward the target.
Pebbled ice is used because it makes the spin controllable, according to Shegelski.
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