Seemingly simple curling sport, but also contains the principle of knowledge, xiaobian bring you close to the world of curling
Of all the sports, curling is one of my favorites.It is not only a physical test, but also a mental test. It is not only a sport, but also an intellectual competition. Therefore, the title “chess on ice” is too appropriate.Curling also shows the beauty of movement and movement, explains the way to choose and reject, and contains a lot of physics knowledge principles, such as sliding friction factors, the relationship between pressure and melting point, momentum conservation and so on.Curling is not made of ice, it’s made of stone.The stone used for curling has to be frost resistant and crash-resistant. It has to be hard enough.Therefore, granite without mica is generally used for manufacturing.But not all granite is suitable for curling. Most of the world’s best curling stones are made from natural granite on ailsa Craig, a small island off the coast of Scotland.The cost of curling is very high due to the rare materials, complicated technology and various processes.Don’t look at a forty catties of stone, its price is not low, each curling about ten to twelve thousand dollars, each game with sixteen, good guy, this set of curling words that can be more than ten or two million.A 40 kg is the weight of the curling, so heavy a stone, even on the ice, want to let it slide forward dozens of meters, also is not an easy thing, because it will be great friction after curling when sliding forward, after ignoring air resistance in horizontal direction, mainly by sliding friction between the ice and curling.In order to further reduce friction, the ice maker will spray water to the ice surface with the sprinkler head before the competition. The small water droplets sprayed will condense into small ice particles covering the ice surface, making the ice surface uneven. In this way, the contact ring at the bottom of the curling can only contact with the apex of the small ice particles, further reducing the contact area.Although various ways are taken to reduce the contact area between curling and the ice surface, the weight of 40 kg is too much for small ice grains, and it is easy to be broken into ice residue.To further reduce friction, the most common way is to rub the ice.It can be described as a miracle!The faster and harder you rub it, the more slippery the ice will be, and the better for curling.So if you want the curling to slide in any direction, you just rub the ground.One interesting thing you might have noticed is that athletes are Shouting as they brush the ground. What are they Shouting?Curling or a voice-activated high-tech project?Of course not.Since the arena is 40 meters long, the Shouting is the voice of the captain or the main force to tell the players how hard and direction to rub the ice, and the players will also voice back, hence the “roar game”.How does a spinning curling stone turn?It’s still a mystery!I don’t know if I’ll win a Nobel Prize if I find the answer.One popular theory is that the “back edge” of a rotating curling stone has 10 times the friction coefficient of the “front edge.”In theory, if the stone spins counterclockwise, the front edge will experience a force of friction f to the right when it turns left, and the back edge will experience a force of friction F to the left, so the stone will deflect to the left.