【零粘合剂!天体物理学家用摩擦力创作网球雕塑】

【零粘合剂!天体物理学家用摩擦力创作网球雕塑】54岁的Andria Rogava教授是一名网球爱好者和天体物理学家,这位天体物理学家创造了一种不用胶带、胶水或任何其他粘合剂——仅仅靠摩擦就能将网球堆成反重力形状的网球塔,仅靠摩擦力和平衡力就能使这些奇怪的结构保持直立。塔身因为它们自身的重量产生了平衡力团聚在一起,每一个的球产生足够的摩擦力来保持平衡。目前,教授正在尝试搭更高的塔。

Physicist creates sculptures out of tennis balls using nothing but FRICTION to keep them together

  • Professor Andria Rogava, 54, is a keen tennis player and an astrophysicist
  • The towers are held together because their own weight creates balancing forces
  • Each of the fuzzy balls generates just enough friction to maintain an equilibrium
  • Starting with relatively simple pyramids, he moved to more complex structures
  • The physicist has even created a nine-story tower made up of 25 tennis balls

    Towers of stacked tennis balls built in gravity-defying shapes have been created by  a physicist without the use of tape, glue or any other adhesive - just friction.

    Professor Andria Rogava of Tbilisi, Georgia, built the towers in his office, finding that friction and balancing forces alone can keep the bizarre structures upright.

    He has even succeeded in creating a thin, nine-story tower made up of just 25 balls — and could go higher still.

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    Towers of stacked tennis balls in shapes that look like they are defying gravity ¿ although require no glue to stay upright ¿ have been built by a physicist. He has even succeeded in creating a thin, nine-story tower made up of just 25 balls ¿ and could go higher still

    Towers of stacked tennis balls in shapes that look like they are defying gravity — although require no glue to stay upright — have been built by a physicist. He has even succeeded in creating a thin, nine-story tower made up of just 25 balls — and could go higher stillProfessor Rogava described himself as a 'keen tennis player' and told Physics World: 'In my office, I have about 20 used tennis balls and so decided to try building some tennis-ball "pyramids".'

    Initially, he created a four-level pyramid with a triangular-shaped base, with ten balls in the bottom layer, six in the next, then three and finally one ball at the apex.

    'When I carefully removed the three corner balls from the bottom layer plus the upper-most ball, I ended up a with a beautiful, symmetric structure of 16 balls with three hexagonal and three triangular sides,' Professor Rogava explained.

    Despite appearing precarious, the over-hanging balls in the second-to-bottom layer remain in equilibrium.

    'These exposed balls are held in place because the balls directly above press down on them and into the two adjacent balls of the bottom layer, producing a pair of reaction forces to balance their weight,' Professor Rogava explains.

    'The torques are balanced too, with enough friction between the felt-covered balls to guarantee equilibrium,' he added.

    The fact that this structure could support itself left the physicist 'intrigued' as to what else he could build.

    Next, he recreated the original four-layer, 20-ball pyramid and removed all the three corner balls in the lowest layer.

    Professor Rogava found that as long as he left the single tennis ball at the top of the structure, he could carefully remove the three corner balls from the second-lowest layer as well, without the structure falling down.

    'What I ended up with was a bizarre, Christmas-tree-like structure made of 14 balls, he said.

    The key to the tower is the top ball, which keeps the whole structure steady, pressing down on the layers below.

    In turn, counter-reactions keep the layers above steady.

    'Friction is vital,' Professor Rogava said.

    'Without it, there would be no torque balance and the balls would roll away.'

    Professor Andria Rogava of Tbilisi, Georgia, built the towers in his office, finding that friction and balancing forces alone can keep the bizarre structures standing

    Professor Andria Rogava of Tbilisi, Georgia, built the towers in his office, finding that friction and balancing forces alone can keep the bizarre structures standing

    Once a basic tower has been built, the structure can be built higher by adding more three-balls to the tower in turn.

    'It got increasingly hard to make the towers as they got taller,' Professor Rogava admitted.

    'To create [a] seven-storey, 19-ball structure I needed special scaffolding in the form of tennis-ball boxes and my hands to support the tower as it went up,' he added.

    'I could remove the scaffolds only after putting the top ball on.'

    Once a basic tower has been built, the structure can be built higher by adding more three-balls to the tower in tur

    Once a basic tower has been built, the structure can be built higher by adding more three-balls to the tower in turn

    Having acquired more tennis balls, Professor Rogava is continuing to explore what kinds of even more elaborate structures he can create.

    'I’ve also recently managed to make an exotic 46-ball frustum pyramid,' he noted.

    A frustum is the shape formed when one part of a pyramid or cone is cut off along a plane parallel to the opposite side.

    'I can find no mention of such (tennis ball) structures online,' Professor Rogava noted.

    He concluded: 'I wonder even if my “discovery” could be turned into a board game of some sort, with players required to build complex structures from such balls?'

    原文链接:https://www.dailymail.co.uk/sciencetech/article-7061931/Physicist-creates-sculptures-tennis-balls-using-FRICTION-together.html


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