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Why a Perfect Spiral Football Pass doesn’t break the laws of physics




They too were intrigued.

I played football in New York City a long time ago, said Dr. Price; he attended Stuyvesant High School, which, like Caltech, is known for its high-achieving academics and not for its athletics. I strived to be mediocre. Never quite got there.

Dr. Moss was a classmate and teammate of Dr. Gays at Caltech. I couldn’t play anywhere else, said Dr. Moss. The coach gave me a red helmet and said to everyone on the team, don’t kill the kid in the red helmet. True story.

Dr. Price said he hadn’t thought about this problem until he and Dr. Gay met at a scientific conference and talked about it.

I went on to apply some pretty simple math and did what physicists do, “said Dr. Price. That’s trying to throw out all the irrelevant details and get the gist of something. Throw out the bath water and look very closely at make sure there are no babies in it.

The first thought experiment was to remove the atmosphere from the equations. But then the only force acting on the football would be gravity, which would act equally on all parts of the ball and not exert a twisting force to push the nose down. It will always point in the same direction because it acts like a gyroscope, said Dr. Price. The tip of the nose will not fall over and go down.

Obviously, air resistance, along with gravity, played a key role, but not the one suggested by the simplistic analysis. It’s pretty cool because you have these two effects, both of which seem to have nothing to do with what we’re actually seeing, said Dr. Price.

The three scientists were not the first to investigate this phenomenon, and others showed through wind tunnel experiments and computer simulations that thrown footballs do not violate the laws of physics.

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