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Kendama play has also been used as a measure of accuracy, agility, and learning ability in robotic arms. [41] [42] Rules [ edit ] EKC is the biggest kendama event in Europe and one of the largest worldwide with 450 attendees in 2023 and thousands more watching online. It was the first event outside of the USA streamed by Sweets Kendamas on Twitch. The event is currently held in Leiden (Netherlands). The EKC's main event is the Freestyle, only recently hosting an Open division (2022). It has the reputation to be the world's most exciting event, looking more like a Hip-Hop concert than the conventional kendama competition. Team". KROM Kendama. Archived from the original on February 20, 2022 . Retrieved February 12, 2020. Freestyle + Open". Sweets Kendamas. 2018. Archived from the original on January 25, 2020 . Retrieved January 25, 2020.

Starting in 2014, the Kendama World Cup (KWC) is an annual two-day event in the summer that takes place in Hatsukaichi, Hiroshima, Japan and is the largest kendama competition in the world. In 2018 alone, the KWC had an audience of 49,000 members that were watching 415 competitors from 18 countries [46] compete for the title of Kendama World Champion.

Kendama competitions have been occurring since 1979, with the first competition being the All Japan Kendama-Do Championships held by the Japan Kendama Association. [47] The British Kendama Association was the first group to hold a formal kendama contest outside Japan in 2008 at the British Juggling Convention in Doncaster. Kendama competitions have taken a variety of formats including speed ladders, freestyle, head-to-head, and world championship style. [48] When swinging the ball, which gives it momentum, the ball is unable to travel in a straight line. The string puts a tension on the ball causing it to arc around. In other words, the ball is put into a circular trajectory due to the centripetal force being provided by the tension in the string which is proportional to the tangential speed of the ball. To prove the is a central force to the audience, just simply let go of the string. The ball will then travel tangent to the circular trajectory it was on. Isaza, Kim (November 18, 2011). "Dama Fest: Exhibition for popular Japanese hand-held game rising in popularity set for Saturday at Galleria". Marietta Daily Journal . Retrieved February 7, 2020. Let's say that our 10 kg weight is no longer being swung but is now being dragged horizontally along the ground by our rope. Let's say that the ground has a kinetic friction coefficient of 0.5 and that our weight is moving at a constant velocity but that we want to accelerate it at 1 m/s 2. This new problem presents two important changes - first, we no longer have to calculate tension due to gravity because our rope isn't supporting the weight against its force. Second, we have to account for tension caused by friction, as well as that caused by accelerating the weight's mass. We would solve as follows:

Lean the ken about 45° downward so that the basecup turns starts to face toward the ground, causing the ball to start to fall off the big cup Product Launch Platform, The Grommet, Works with Atlanta-Based Entrepreneur to Feature Kendama, Japanese Skill Toy". PRWeb . Retrieved 2018-04-19.The origins of kendama are disputed, but it is generally believed to have originated during the 17th or 18th century. Kendama started to evolve when it came to Japan during the Edo period, and since then the use of the toy has spread throughout the world. The size and materials used to create kendamas now vary as they are offered in jumbo and mini sizes, and have been created out of plastic, metal, and nylon. There are now kendama competitions held in countries all over the world, the biggest competition being the annual Kendama World Cup in Japan. [2] Terminology and structure [ edit ] Anatomy of kendama Define the forces on either end of the strand. The tension in a given strand of string or rope is a result of the forces pulling on the rope from either end. As a reminder, force = mass × acceleration. Assuming the rope is stretched tightly, any change in acceleration or mass in objects the rope is supporting will cause a change in tension in the rope. Don't forget the constant acceleration due to gravity - even if a system is at rest, its components are subject to this force. We can think of a tension in a given rope as T = (m × g) + (m × a), where "g" is the acceleration due to gravity of any objects the rope is supporting and "a" is any other acceleration on any objects the rope is supporting. [2] X Research source Keep an eye on the hole, and from the bottom cup, hop the ball up and catch the ball by landing the hole on to the spike [8] Typically at these events, there are vendors that sell kendamas, clothing, and accessories. Competitions can range from 1–3 days long and prizes are provided for the 1st, 2nd, and 3rd-place winners of each competition category. Popular competitions include the North American Kendama Open & the Kendama World Cup (KWC). Almost every kendama company has a team of sponsored players to help promote their brands. Sponsored players range in age and location around the world. [36] [37] [38] [39] [40]

As an example, let's consider a system where a weight hangs from a wooden beam via a single rope (see picture). Neither the weight nor the rope are moving - the entire system is at rest. Because of this, we know that, for the weight to be held in equilibrium, the tension force must equal the force of gravity on the weight. In other words, Tension (F t) = Force of gravity (F g) = m × g. Let's say that when our pendulum forms an angle of 15 degrees with the vertical, it's moving 1.5 m/s. We would find tension by solving as follows: Despite not being originated in Japan, the shape of kendama that is known today was formed and evolved in Japan. The S (Shinma)-Type kendama was the first competition style kendama invented in 1975 by Hideo Shinma, the president of the Tokyo Kendama Club. [19] The first S-type prototype emerged in 1976, and the Japan Kendama Association (JKA) asked Shinma to make them a competition style model based on the S-Type design in 1977. Ito, Masami (November 8, 2014). "Kendama: a whole new ball game". Japan Times . Retrieved February 7, 2020.Lift loads using a pulley with non-parallel vertical strands. Pulleys are often used to direct tension in a direction other than up or down. If, for instance, a weight is suspended vertically from one end of the rope while the other end is attached to a second weight on a diagonal slope, the non-parallel pulley system takes the shape of a triangle with points at the first weight, the second weight, and the pulley. In this case, the tension in the rope is affected both by the force of gravity on the weight and by the component of the pulling force that's parallel to the diagonal section of rope. [7] X Research source Maruta, Catalin (September 7, 2018). "Cei mai buni din lume la kendama se pregatesc de duel". YouTube. Archived from the original on 2021-12-13 . Retrieved February 12, 2020. Since the direction and magnitude of centripetal force changes as the object on the rope moves and changes speeds, so does the total tension in the rope, which always pulls parallel to the rope towards the central point. Remember also that the force of gravity is constantly acting on the object in a downward direction. So, if an object is being spun or swung vertically, total tension is greatest at the bottom of the arc (for a pendulum, this is called the equilibrium point) when the object is moving fastest and least at the top of the arc when it is moving slowest. [5] X Research source Candle grip: Face the ken with the spike pointed downward. Hold the ken with three fingers: index, middle, and the thumb. [3]