Keith Mack
The perfect spiral is a football pass that doesn't break the laws of physics. In fact, physicists have helped explain the magic that occurs when a quarterback goes deep.
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What You'll Learn
The physics of a perfect spiral football pass
A perfect spiral football pass doesn't break the laws of physics. In fact, physicists have helped explain the magic when a quarterback goes deep.
To achieve a perfect spiral, the quarterback must apply the right amount of force to the ball at the correct angle. This force, combined with the ball's spin, creates lift, which helps the ball travel further. The quarterback's arm motion also plays a role in creating the spiral. As the ball is released, the quarterback's arm continues to move forward, imparting a forward spin to the ball, which helps it cut through the air more efficiently.
The shape of the ball also contributes to the spiral. A football is not perfectly spherical; it is slightly elongated, with pointed ends. This shape helps the ball cut through the air more easily and creates less drag, allowing it to travel further and faster.
Finally, external factors such as wind speed and direction can also affect the spiral. A strong headwind, for example, can disrupt the ball's trajectory and cause it to tumble. However, a gentle tailwind can actually help the ball travel further and maintain its spiral shape for longer.
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The magic of a quarterback
A perfect spiral football pass does not break the laws of physics. But how do quarterbacks make it look so easy?
The first key to throwing a spiral is the grip. The quarterback uses their other arm to twist their upper body while stepping forward into the throw as they prepare to release the ball. The last finger that should touch the ball as the hand releases it is the quarterback's index finger. The spiral is created by that final flick.
The key to a perfect spiral is getting the right balance of precisely controlled velocity and a good spin rate on the ball. The nose of the football should always be facing the target, and the quarterback's feet should be shoulder-width apart.
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The science of a football pass
When a quarterback launches a deep pass, the ball slices through the air with barely a wobble and lands directly in the hands of the receiver. To most fans, this looks perfectly natural. However, to physicists, it is utterly confounding. That's because a spiral football appears to defy the property of conservation of angular momentum, which states that the axis of a spinning object will not change its orientation unless some force acts to twist it.
The nose of the football points upward in the direction of the throw. As it arcs through the air, spinning along the long axis without any visible wobble, the nose of the football dips, following the trajectory of the throw and pointing downward when it lands in the hands of the receiver. This movement seems to suggest that some force is pushing the football's nose down, but it is unclear what this force could be. In fact, the most simplistic analysis would suggest that the onrush of air from below would nudge the nose of the football up, not down.
So, why doesn't a perfect spiral break the laws of physics? The answer lies in the complex interplay of forces acting on the football as it spins through the air. While the conservation of angular momentum states that the axis of a spinning object should not change its orientation, it also allows for the possibility of a force acting to twist it. In the case of a football pass, this force could be the result of several factors, including the spin of the ball, the air resistance, and the way the quarterback releases the ball.
By understanding these forces and applying them to their own passing game, quarterbacks can learn to unleash the same powerful physics that make a perfect spiral pass so impressive.
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The laws of physics
A perfect spiral football pass doesn't break the laws of physics. In an article in the New York Times, Kenneth Chang explains how physicists have helped to explain the magic when a quarterback goes deep.
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The explanation of a perfect spiral
A perfect spiral is a curve that extends in both perpendicular directions within its plane. It keeps the same scale with each turn and is considered to follow the golden ratio. The further along the Fibonacci sequence you go, the closer the ratio between successive numbers in the sequence gets to Phi, or 1.618, which is the Golden Ratio. To see a Fibonacci spiral, draw a series of squares with sides the length of the numbers in the sequence: a 1x1 square, a 2x2 square, a 3x3 square, 5x5 and so on. Once you have your squares, you can use them to trace a perfect spiral by drawing a curve from corner to corner. In nature, each petal of a flower would develop a factor of the Golden Ratio away from the last petal, allowing a spiral to form.
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Frequently asked questions
A perfect spiral does not break the laws of physics because it does not conflict with the property of conservation of angular momentum.
The conservation of angular momentum is a fundamental property of motion which states that the axis of a spinning object will not change its orientation unless some force acts to twist it.
It is not clear what force could be pushing the nose of a perfect spiral down. In fact, the onrush of air from below would nudge the nose of the spiral up, not down, and flip it backward.
A perfect spiral allows a quarterback to launch a deep pass, with the ball slicing through the air with barely a wobble and landing directly in the hands of the receiver.
