Speed Skaters 'Run' On Ice, So Why Do Their Arms Go Sideways?

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   Wochit
Speed skaters swing their arms backward and to the side, not back and forth. Why?As the skater pushes off the ice with his back foot, a force is exerted on the skate blade in a right angle.The only way to propel yourself forward is to push off the ice in a diagonal motion, rather than straight back.If a skater tried to push off the ice in a direction parallel to the skate blade, they couldn't do it.That's because there is almost no friction between the ice and skate blade.


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