Sienna Rhodes
The cracking sound produced by a whip is caused by a mini-sonic boom, created when a section of the whip moves faster than the speed of sound. This phenomenon has been observed in slow-motion videos, and through high-speed photography, with the tip of the whip travelling at speeds above that of sound. While it was initially believed that the crack was caused by the tip of the whip breaking the sound barrier, recent findings suggest that it is actually the loop in a whip that creates the sonic boom. Whip-cracking has been used in livestock driving and horse riding and has become a performing art and competitive sport in some parts of the world.
| Characteristics | Values |
|---|---|
| What creates the cracking sound of a whip? | A mini-sonic boom created by a supersonic motion of the whip's end. |
| How does the whip's end gain supersonic velocity? | As the whip becomes thinner, the same energy is distributed over a smaller mass, increasing the speed of the whip particles. |
| What is the speed of a sonic boom? | The speed of sound in the air is around 330 m/s. |
| What is the speed of the whip's tip when it creates a sonic boom? | More than 900 m/s. |
| What is the speed of the whip's tip when it first reaches the speed of sound? | Less than a tenth of the speed of sound, i.e., less than 33 m/s. |
| Do whips always break the sound barrier? | No, it depends on the skill of the person cracking the whip. |
| What is the sound caused when something breaks the sound barrier? | A shock wave. |
| Can dinosaurs break the sound barrier with their tails? | No, according to a 2022 model, the caudal vertebrae of the dinosaurs would break if they attempted to do so. |
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What You'll Learn
The sonic boom phenomenon
The crack of a whip is a sonic boom, a phenomenon that was first recognised by Otto Lummer in 1905. It was finally proven experimentally in 1927 by Carrière, who used high-speed shadow photography to capture a sonic boom created by the whip wave and recorded tip velocities of over 900 m/s.
The sonic boom occurs when a section of the whip, specifically the loop in the whip, travels faster than the speed of sound. The tip of the whip moves twice as fast as the loop, but it is the loop that is the noisemaker. As the whip is swung, the loop travels along the whip, gaining speed until it reaches the speed of sound and creates a sonic boom.
The creation of the sonic boom by a whip can be explained by the conservation of energy. As the whip becomes thinner, the same amount of energy is distributed over a smaller mass, so the speed of the whip particles increases. This results in a mini-sonic boom, similar to the sound of a supersonic bullet.
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Whipcracking as a sport and art
Whipcracking is the act of producing a cracking sound by using a whip. It is a performing art that is part of rodeo shows in the United States and has also become a competitive sport in Australia and the United Kingdom. In Australia, whip-cracking competitions focus on completing complex, multiple-cracking routines and precise target work. The most common whip used in Australian competitions is the Australian stockwhip, unique to the country.
Whipcracking is also a traditional sport in Bavaria, where it is known as Goaßlschnalzen, and in various Alpine areas, where it is called Aperschnalzen. In Hungary, it is called Ostorozás. The tradition of competitive whipcracking was revived in the first half of the 20th century. The word "aper" means "area free of snow," and it has been thought that this tradition had a pagan meaning of "driving the winter away" by whipcracking.
Whipcracking has also been used for herding cattle and during horse riding. In earlier centuries, carriage drivers used elaborate crack sequences to signal their approach and identify themselves. Over time, horse-drawn transport dwindled, but the tradition remained, and coaches continued to practice their skill. Today, the Goaßlschnalzer ("whip snappers") do concert performances, often as bands that include conventional musical instruments.
Whipcracking as a sport offers the potential for great skill development, whether in accuracy, manipulating targets, or multiple cracking. While a skilled whip artist can perform surprising tricks with a poor whip, good whips are essential for developing good skills and routines. Shorter whips allow for a greater variety of routines and faster action.
The cracking sound produced by a whip is caused by a loop in the whip traveling along it, gaining speed until it reaches the speed of sound and creates a sonic boom. While it was previously thought that the tip of the whip was the source of the sound, recent findings suggest that the loop is the true noisemaker.
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The loop in the whip
The loop in a whip is the real noisemaker, not the tip. The crack of a whip comes from a loop that travels along the whip, gaining speed until it reaches the speed of sound and creates a sonic boom. This loop is formed by the whip's handle, which is thicker, and the whip's tip, which is thinner. As the whip is swung, the loop travels down the whip, gaining speed until it exceeds the speed of sound, creating a sonic boom.
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The velocity of the whip
The velocity of a whip is a fascinating phenomenon that has intrigued people for centuries. When a whip is cracked, it produces a sharp and distinct loud noise, commonly known as a "crack". This crack is the result of the whip breaking the sound barrier and creating a mini-sonic boom. While it was once believed that the tip of the whip was responsible for this supersonic motion, recent findings have revealed a more intricate mechanism.
The whip's unique structure, with a thick rope at the handle end and thin strands at the tip, contributes to this velocity increase. The decreasing diameter allows for a longer distance to be traced by the end of the whip with each pass, amplifying the initial motion of the arm. This lengthening effect, combined with the conservation of energy, enables the whip to reach supersonic speeds.
Recent research by Alain Goriely and Tyler McMillen of the University of Arizona has provided new insights into the true cause of the whip's crack. Through mathematical modelling, they discovered that it is not the tip of the whip but rather the loop travelling along it that generates the sonic boom. As the loop moves down the whip, it gains speed until it exceeds the speed of sound, creating the characteristic crack. This finding sheds light on the complex physics behind whipcracking and challenges previously held beliefs.
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Previous misconceptions
For a long time, it was believed that the crack of a whip was the result of the tip of the whip breaking the sound barrier and creating a sonic boom. This theory was based on the observation that the whip's tip moved faster than the speed of sound. However, this idea has been challenged by new findings.
The notion that whips could break the sound barrier was first recognised by Otto Lummer in 1905. Lummer's hypothesis was supported by mainstream scientists and later proven experimentally by Carrière in 1927 using high-speed shadow photography. These early experiments confirmed the creation of a sonic boom by the whip wave and recorded tip velocities exceeding the speed of sound.
The traditional understanding of whip cracking attributed the sound to the whip's tip travelling at supersonic speeds. This belief was based on the observation that the tip of the whip moved faster than the loop, similar to the top of a car's wheel moving twice as fast as the car itself. However, this theory faced a challenge: if the tip were the cause of the crack, why wasn't the sound heard earlier when the tip first reached the speed of sound?
Recent research by Alain Goriely and Tyler McMillen of the University of Arizona has provided new insights. They modelled the behaviour of leather strips and found that the loop in a whip, rather than the tip, is the primary source of the crack. Their calculations revealed that the loop travels along the whip, gradually gaining speed until it surpasses the speed of sound and creates a sonic boom.
Additionally, there was speculation that the cracking sound could be related to mass variance along the length of the whip. However, this theory has been refuted by experiments demonstrating that a leather cord with no tapering can still produce a crack.
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Frequently asked questions
Yes, it has been proven that whips can break the sound barrier.
The speed of the whip increases as it tapers, and the loop in the whip gains speed until it reaches the speed of sound and creates a sonic boom.
The sound caused by a whip cracking is a mini-sonic boom created by a supersonic motion of the end of the whip.
As the whip becomes thinner, the same energy is distributed over a smaller mass, so the speed of the whip particles increases.
