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Winter physics 2018: Luge


AaronSwims

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The 2018 winter Olympic games begin in less than a month on Friday, February 9th in Pyeongchang, South Korea. Though I do prefer the events of the summer games, I will have to wait till Tokyo 2020. However, the winter games still has athletes who use physics in order to bring home the gold. In this post I am focusing on a weird but fun event to watch: Luge. In luge, the athlete must try to travel down a track in the least amount of time in order to win. This is where it gets interesting. After a the athlete creates their initial velocity by moving themselves back and fourth with handles at the start, the only force acting on the Luger which could increase speed. However, it is not so simple as the Luger must fight the friction on the ice from their sled blades and the drag forces of earth's atmosphere. The drag force on a Luger can be calculated by: Fd= .5CpAv2 where C is the drag coefficient (typically ranging from .4 to 1), p is the density of air, A is the frontal area, and v is the velocity of the luger. Minimizing drag increases the luger's speed so they minimize the variables they can. Luger's lay nearly flat on their sleds with pointed toes to create the least possible frontal area. If they didn't have to look up to see where to go, the luger could lay completely flat, but we haven't yet strapped cameras to these people and had video play in their helmets. Go USA! Next, there are two parts of the track, straight and banked turns. While on the straight part of the track, the luger can lay flat, however he must look up to steer on the turns. When going around the turns, the luger expireinces a centriptal acceleration. With speeds reaching 140 km/h, and a turn with a radius of 30.9m, a luger can feel up to 5g's of centripital acceleration.

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