Glidinghttp://www.speedski.co.nz/

Gliding is the art of maintaining the flattest ski in order to achieve the lowest possible friction. The forces associated with gliding are fairly straightforward: gravity, friction, and air resistance. Air resistance has several inputs that add to the total resistive force. Friction is caused by the lack of a perfectly smooth surface between the skis and snow on a microscopic level. Think of it as the Rocky Mountain range trying to slide over the Himalayas. On a microscopic level this is what friction is.

Two factors contribute to the resistive frictional force; a normal force and the friction coefficient. The normal force is the force holding the person up keeping them from falling towards the center of the earth. On level ground the normal force acts straight up against the acceleration of gravity. On a slope, the normal force is equal to the force of gravity proportional to the cosine of the angle of the slope to horizontal. This portion of gravity attempts to accelerate the person toward the center of the earth, the normal force resists this acceleration. The remaining component of gravity accelerates the body down the hill parallel to the slope, a linear acceleration.

http://ski.mountainzone.com/2001/worldcup/alpine/stmoritz/html/photo07.html and http://www.speedski.com/JeffHamilton-tuck.htm

It is the coefficient of friction that speed skiers and racers try to reduce to a minimum. The normal force is a constant since it is related to their body weight, which does not change during the course of the race. The coefficient of friction is already reduced from everyday levels because of the snow, but it is the goal of racers to reduce this to an absolute minimum to maximize speed.

 

 

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TWO ASPECTS OF DOWNHILL RACING:

Gliding

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