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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. Ito, Masami (November 8, 2014). "Kendama: a whole new ball game". Japan Times . Retrieved February 7, 2020. 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. 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 The F16-2, the second version of the F16, was released in 2001. The main change in the F16-2 from the F16 is that the position of the string hole was moved slightly off from the cup body's center, enabling the kendama to turn and rotate in a new fluid way. This string hole adjustment is still used in various shapes of kendamas to this day. [19] Contemporary culture [ edit ]

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] 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:Understand that tension due to gravity changes throughout a swinging object's arc. As noted above, both the direction and magnitude of centripetal force change as an object swings. However, though the force of gravity remains constant, the tension resulting from gravity also changes. When a swinging object isn't at the bottom of its arc (its equilibrium point), gravity is pulling directly downward, but tension is pulling up at an angle. Because of this, tension only has to counteract part of the force due to gravity, rather than its entirety. Candle grip: Face the ken with the spike pointed downward. Hold the ken with three fingers: index, middle, and the thumb. [3] Ken grip: Hold the ken with all five fingers with the spike pointing upwards and the big cup (or small cup) facing towards the body Use multiple strands to support a hanging object. Finally, let's consider an object hanging from a "Y-shaped" system of ropes - two ropes are attached to the ceiling, which meet at a central point from which a weight hangs by a third rope. The tension in the third rope is obvious - it's simply tension resulting from the gravitational force, or m(g). The tensions in the other two ropes are different and must add up to equal the gravitational force in the upward vertical direction and to equal zero in either horizontal direction, assuming the system is at rest. The tension in the ropes is affected both by the mass of the hanging weight and by the angle at which each rope meets the ceiling. [9] X Research source

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. This is the condition for " weightlessness" in any curved motion in a vertical plane. For any velocity above this minimum, we can use conservation of energy to relate the velocity at the bottom of the circle to the velocity at the top. Stringing" a kendama is the action of connecting all three pieces of the kendama ( ken, sarado, and tama) together. A bead (or mini bearing) and a piece of string are required to string a kendama. The steps to string a kendama are as follows: Catch and Flow, Freestyle World Championship was first held in September 2014 in downtown Tokyo, Japan. Using a new format to determine the best freestyle skills in the world, the Catch and Flow defined a new way to perform freestyle kendama and to judge such style. Players from around the world apply to participate by listing their achievements. The top approx. 60 players are selected to perform for 90seconds one by one. Judges determine 16 finalists who will go head to head with 2 x 45seconds for each player in one-on-one battle towards the final. In June 2011, the first public Kendama competition (battle) was held in the state of Tennessee. The event occurred in the city of Nashville hosted by a kendama blog called the "Kensession Stand". The event was called the "Nashville Kendama Battle", and was held at 12th South Taproom.Account for rotational acceleration. An object being rotated around a central point via a rope (like a pendulum) exerts strain on the rope caused by centripetal force. Centripetal force is the added tension force the rope exerts by "pulling" inward to keep an object moving in its arc and not in a straight line. The faster the object is moving, the greater the centripetal force. Centripetal force (F c) is equal to m × v 2/r where "m" is mass, "v" is velocity, and "r" is the radius of the circle that contains the arc of the object's motion. [4] X Research source

if we presume that the string stays taut, then the minimum speed for the mass at the top of the circle is (for g = 9.8 m/s 2) Let's say in our Y-shaped system that the bottom weight has a mass of 10 kg and that the two upper ropes meet the ceiling at 30 degrees and 60 degrees respectively. If we want to find the tension in each of the upper ropes, we'll need to consider each tension's vertical and horizontal components. Nonetheless, in this example, the two ropes happens to be perpendicular to each other, making it easy for us to calculate according to the definitions of trigonometric functions as follows: We know the weight on the ramp will accelerate up the ramp. Since the ramp is frictionless, we know that the tension is pulling it up the ramp and only its own weight is pulling it down. The component of the force pulling it down the ramp is given by sin(θ), so, in our case, we can say that it's accelerating up the ramp due to the net force F = T - m 2(g)sin(60) = T - 5(9.8)(.87) = T - 42.63. [8] X Research source Let's say we have a system with a 10 kg weight (m 1) hanging vertically connected by a pulley to a 5 kg weight (m 2) on a 60 degree ramp (assume the ramp is frictionless).To find the tension in the rope, it's easiest to find equations for the forces accelerating the weights first. Proceed as follows:Deer horn and ball" was the form that the kendama took on when it arrived in Japan for the first time, literally a deer horn attached to a ball. Later on, some people replaced the deer horn with a piece of bamboo due to deer horn costing too many resources, making the bamboo and ball. The next model started to resemble what the kendama looks like today: the ken and ball. This model was a ken piece strung to the ball. Hop the ball over to the big cup by rotating the wrist to the right (and vice versa if left handed)

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. Take one end of the string and put it through the little hole in the tama until the string is coming through the big hole ( ana).Using the centrifugal force conditions, the tension at the bottom can be related to the tension at the top: Account for friction. Any object being pulled by a rope that experiences a "drag" force from friction against another object (or fluid) transfers this force to the tension in the rope. Force from friction between two objects is calculated as it would be in any other situation - via the following equation: Force due to friction (usually written F r) = (mu)N, where mu is the friction coefficient between the two objects and N is the normal force between the two objects, or the force with which they are pressing into each other. Note that static friction - the friction that results when trying to put a stationary object into motion - is different than kinetic friction - the friction that results when trying to keep a moving object in motion.