Friday, September 20, 2013

Air Walking - a twelve step course

Sometimes a young athlete can seem to move so quickly from point to point that her feet never seem to touch the ground. By extension from Newton's first law of motion, minimizing friction should maximize preservation of velocity, but ordinarily one expects the initial acceleration to result from force exerted against the ground, so that the ground exerts a contrary force against the body (second and third laws). Achieving significant force from the air alone is usually the province of bird or insect wings, airplane propellers or jets. Hmm, check out this sequence of seven "steps".

A minute and a half later, here's another low friction run, five steps at low altitude, but clearly airborne.


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