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Streetboarding
A Snakeboard, also known as a Streetboard, or Pivotboard is a type of skateboard invented in South Africa in 1989 by James Fisher, Simon King and Oliver Macleod Smith. The concept was to fuse the original skateboard with elements of snowboarding and surfing to create a fun riding experience. The first prototype was constructed using two square wooden boards, an old roller skate chopped in half, and a piece of plumbing pipe to join them together. Many variants were tried before manufacturing began. The first boards to be mass-produced were made from a strong plastic nylon known as Zytel ST801. Performance The rider of a snakeboard stands with one foot on each footplate (the feet are usually fixed to the board using bindings) and, by moving their feet in and out in conjunction with the shoulders and hips, is able to propel the board in any direction using only body weight. This transfer of energy is called nonholonomic locomotion. The board moves in a motion similar to that of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Africa
South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic Ocean, South Atlantic and Indian Ocean; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; to the east and northeast by Mozambique and Eswatini; and it encloses Lesotho. Covering an area of , the country has Demographics of South Africa, a population of over 64 million people. Pretoria is the administrative capital, while Cape Town, as the seat of Parliament of South Africa, Parliament, is the legislative capital, and Bloemfontein is regarded as the judicial capital. The largest, most populous city is Johannesburg, followed by Cape Town and Durban. Cradle of Humankind, Archaeological findings suggest that various hominid species existed in South Africa about 2.5 million years ago, and modern humans inhabited the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Streetboarding
A Snakeboard, also known as a Streetboard, or Pivotboard is a type of skateboard invented in South Africa in 1989 by James Fisher, Simon King and Oliver Macleod Smith. The concept was to fuse the original skateboard with elements of snowboarding and surfing to create a fun riding experience. The first prototype was constructed using two square wooden boards, an old roller skate chopped in half, and a piece of plumbing pipe to join them together. Many variants were tried before manufacturing began. The first boards to be mass-produced were made from a strong plastic nylon known as Zytel ST801. Performance The rider of a snakeboard stands with one foot on each footplate (the feet are usually fixed to the board using bindings) and, by moving their feet in and out in conjunction with the shoulders and hips, is able to propel the board in any direction using only body weight. This transfer of energy is called nonholonomic locomotion. The board moves in a motion similar to that of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human-powered Vehicles
Human-powered land vehicles are land vehicles propelled over ground by human power, The main ways to support the weight of a human-powered land vehicle and its contents above the ground are rolling contact; sliding contact; intermittent contact; no contact at all as with anything carried; or some combination of the above. The main methods of using human power to propel a land vehicle are some kind of drivetrain; pushing laterally against the ground with a wheel, skate, or ski that simultaneously moves forward; by pushing against the ground directly with an appendage opposite to the direction of travel; or by propeller. Human-powered land vehicles can be propelled by persons riding in the vehicle or by persons walking or running and not supported by the vehicle. Many human-powered land vehicles can also be gravity-powered land vehicles, and vice versa, although some of the latter are quite awkward to use as the former. For example: street luges, gravity racers, and snow boards. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skateboard
A skateboard is a type of sports equipment used for skateboarding. It is usually made of a specially designed 7–8-ply maple plywood deck and has polyurethane wheels attached to the underside by a pair of skateboarding trucks. The skateboard moves by pushing with one foot while the other foot remains balanced on the board, or by Pump (skateboarding), pumping one's legs in structures such as a bowl or half pipe. A skateboard can also be used by standing on the deck while on a downward slope and allowing gravity to propel the board and the rider. If the rider's leading foot is their left foot, they are said to ride "regular". Conversely, they are said to ride "goofy" if their leading foot is their right foot. The two main types of skateboards are the longboard and shortboard. The shape of the board is also important: the skateboard must be concaved to perform tricks. History Skateboarding, as it exists today, was probably born sometime in the late 1940s, or early 1950s, when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sergi Nicolas FS 360 One Foot
Sergius is a male given name of Ancient Roman origin after the name of the Latin ''gens'' Sergia or Sergii of regal and republican ages. It is a common Christian name, in honour of Saint Sergius, or in Kyivan Rus', of Sergius of the Holy Caves (Saint Sergius the Obedient of the Kiev Caves), one of saint Fathers of Kyiv, Saint Sergius of Radonezh, and has been the name of four popes. It has given rise to numerous variants, present today mainly in the Romance (Serge, Sergio, Sergi) and Slavic languages (Serhii, Sergey, Serguei, Srđan). It is not common in English, although the Anglo-French name Sargent is possibly related to it. Etymology The name originates from the Roman ''nomen'' (patrician family name) ''Sergius'', after the name of the Roman ''gens'' of Latin origins Sergia or Sergii from Alba Longa, Old Latium, counted by Theodor Mommsen as one of the oldest Roman families, one of the original 100 ''gentes originaria''. It has been speculated to derive from a more ancien ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ollie (skateboarding)
The ollie is a skateboarding trick where the rider and board leap into the air without the use of the rider's hands. It is the combination of stomping (also known as popping) the tail of the skateboard off the ground to get the board mostly vertical, jumping, and sliding the front foot forward to level out the skateboard at the peak of the jump. The ollie is a fundamental skill in skateboarding. Ollies are necessary to leap onto, over, or off of obstacles. As most flip tricks depend on it, the ollie is often the first skill to be learned by a new skateboarder and typically takes considerable practice to master. Origin of the technique In 1978, Alan Gelfand, who was given his nickname "Ollie" by Scott Goodman, learned to perform frontside no-handed aerials in bowls and pools using a gentle raising of the nose and scooping motion to keep the board with the feet. There are numerous references to Alan Gelfand's ollie, most notably pictures in the 1970s skateboarding magazine ''Skate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somersault
A somersault (also ''flip'', ''heli'', and in gymnastics ''salto'') is an acrobatics, acrobatic exercise in which a person's body Rotation#Sports, rotates 360° around a horizontal axis with the feet passing over the Human head, head. A somersault can be performed backwards, forwards or sideways and can be executed in the air or on the ground. When performed on the ground, it is typically called a Roll (gymnastics), roll. Etymology The word 'somersault' is derived from Old Provençal ''sobresaut'' (via Middle French ''sombresault'') meaning "jump over", from ''sobre'', "over" (from Latin ''supra-'', as in ''supranational''); and ''saut'', "jump" (from Latin ''saltus'', the same root as ''salient''). Types Body positions Somersaults may be performed with different positions, including tucked, piked (bent at the hips), straddled, and layout (straight body). Somersaults are often completed with twists. Direction The sport of tumbling (sport), tumbling does not require part ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Momentum
In Newtonian mechanics, momentum (: momenta or momentums; more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If is an object's mass and is its velocity (also a vector quantity), then the object's momentum (from Latin '' pellere'' "push, drive") is: \mathbf = m \mathbf. In the International System of Units (SI), the unit of measurement of momentum is the kilogram metre per second (kg⋅m/s), which is dimensionally equivalent to the newton-second. Newton's second law of motion states that the rate of change of a body's momentum is equal to the net force acting on it. Momentum depends on the frame of reference, but in any inertial frame of reference, it is a ''conserved'' quantity, meaning that if a closed system is not affected by external forces, its total momentum does not change. Momentum is also conserved in special relativity (with a mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Stock Exchange
The London Stock Exchange (LSE) is a stock exchange based in London, England. the total market value of all companies trading on the LSE stood at US$3.42 trillion. Its current premises are situated in Paternoster Square close to St Paul's Cathedral. Since 2007, it has been part of the London Stock Exchange Group (LSEG, which the exchange also lists (ticker symbol LSEG)). Despite a post-Brexit exodus of stock listings from the LSE, it was the most valued stock exchange in Europe as of 2023. According to the 2020 Office for National Statistics report, approximately 12% of UK-resident individuals reported having investments in stocks and shares. According to a 2020 Financial Conduct Authority report, approximately 15% of British adults reported having investments in stocks and shares. History Coffee House The Royal Exchange, London, Royal Exchange had been founded by the English financier Thomas Gresham and Sir Richard Clough on the model of the The Belgian bourse of Antwerp, An ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skateboard
A skateboard is a type of sports equipment used for skateboarding. It is usually made of a specially designed 7–8-ply maple plywood deck and has polyurethane wheels attached to the underside by a pair of skateboarding trucks. The skateboard moves by pushing with one foot while the other foot remains balanced on the board, or by Pump (skateboarding), pumping one's legs in structures such as a bowl or half pipe. A skateboard can also be used by standing on the deck while on a downward slope and allowing gravity to propel the board and the rider. If the rider's leading foot is their left foot, they are said to ride "regular". Conversely, they are said to ride "goofy" if their leading foot is their right foot. The two main types of skateboards are the longboard and shortboard. The shape of the board is also important: the skateboard must be concaved to perform tricks. History Skateboarding, as it exists today, was probably born sometime in the late 1940s, or early 1950s, when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east. Europe shares the landmass of Eurasia with Asia, and of Afro-Eurasia with both Africa and Asia. Europe is commonly considered to be Boundaries between the continents#Asia and Europe, separated from Asia by the Drainage divide, watershed of the Ural Mountains, the Ural (river), Ural River, the Caspian Sea, the Greater Caucasus, the Black Sea, and the waterway of the Bosporus, Bosporus Strait. "Europe" (pp. 68–69); "Asia" (pp. 90–91): "A commonly accepted division between Asia and Europe ... is formed by the Ural Mountains, Ural River, Caspian Sea, Caucasus Mountains, and the Black Sea with its outlets, the Bosporus and Dardanelles." Europe covers approx. , or 2% of Earth#Surface, Earth's surface (6.8% of Earth's land area), making it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Energy Transformation
Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work (e.g. lifting an object) or provides heat. In addition to being converted, according to the law of conservation of energy, energy is transferable to a different location or object or living being, but it cannot be created or destroyed. Limitations in the conversion of thermal energy Conversions to thermal energy from other forms of energy may occur with 100% efficiency. Conversion among non-thermal forms of energy may occur with fairly high efficiency, though there is always some energy dissipated thermally due to friction and similar processes. Sometimes the efficiency is close to 100%, such as when potential energy is converted to kinetic energy as an object falls in a vacuum. This also applies to the opposite case; for example, an object in an elliptical orbit around another body ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
