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The Tortoise kendama by Tortoise, Inc. was a take on the S-type kendama after the S-type discontinued in 1990. Tortoise kendamas came in different models: the T-8, T-14, T-16, and T-17. The numbers indicating each different Tortoise model corresponds with the height of each model in centimeters. Tortoise kendamas stopped production in 2012 due to not having enough resources.  Natural Jute Twine 65 yards (195 ft) | Home & Garden Supply | Decorative Twine | Wedding Decor | Rustic Home Decor | Rustic Wedding
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.  X Research source Let's say we have two weights hanging vertically from a pulley in parallel strands. Weight 1 has a mass of 10 kg, while weight 2 has a mass of 5 kg. In this case, we would find tension as follows:
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. 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) 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.Biswa N. Datta (28 July 1999). Applied and Computational Control, Signals, and Circuits. Springer Science & Business Media. pp.177–. ISBN 978-0-8176-3954-9.