介绍滑板(英和中)急

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介绍滑板(英和中)急

介绍滑板(英和中)急
介绍滑板(英和中)急

介绍滑板(英和中)急
在十九世纪五十年代末的太平洋彼岸,善于发明创造的爱迪生的后裔们把古老神州人们的幻想或多或少地变成了现实.五十年代初美国西海岸是弄潮儿们大试身手的地方.他们使用普通木头和价格昂贵的轻木制成的冲浪板在风口浪尖上寻找乐趣.到五十年代中期,模压聚氨酯泡沫和玻璃纤维取代了木制冲浪板.这些新型冲浪板的机动性和耐用性使得冲浪运动在五十年代末大为流行.
  滑板运动是冲浪运动在陆地上的延伸.前者受地理和气候条件的限制,而后者则有更大的自由度.阳光明媚的南加州海滩社区的居民们很快制出了世界上第一块滑板.
  在今天看来,那是相当古朴的一项发明:一块50*50CM的木板固定在轮滑的铁轮子上.即使这样一个简单的运动器械,因为它能提供冲浪给人带来的同样心理感受,也引起了人们的足够兴趣.
  但是,这种第一代滑板由于其本身的落后性(板太笨重,无弹性,转向机构不灵敏,轮子太滑等),滑板运动并未得到像今天这样的普及,这种最早的滑板可以在滑板录像节目《禁止》(Ban This)中看到.
  第2代的滑板诞生于1962年.这是由橡木多层板压制而成的15*60厘米的板面、轮滑转向桥和塑料轮子组成的.和第一代滑板相比,这种滑板无疑是技术上的一个飞跃.但是,这种滑板的塑料轮的性能依然很不理想.他的过小的附着摩擦力使滑板急转弯时失控;而他的低弹性则是滑板遇到即使微小的障碍物也会嘎然而止,把滑手摔下来.同时,他的耐磨性也太差.尽管如此,这种滑板仍然受到滑手们的普遍欢迎.毕竟,和前一代滑板相比,它已经有了很大程度的进化,相对宽大的板面使滑手们更容易站立和操纵.中国国内现在销售的滑板大多数属于这种第二代产品.
  1973年,一个叫弗兰克·纳斯沃西的滑板爱好者第一次把聚氨酯轮子安上他的滑板并取得意想不到的效果.他随即开始把这种叫“卡迪拉克”牌的轮子卖给他的滑板朋友们.这种柔韧的轮子不仅耐磨,而且可以使滑板安全稳当的急转弯,轻而易举的碾过地上的小障碍物.第三代滑板就这样发明了.由于滑板从冲浪衍生的原因,七十年代初的滑板文化基本上是带有冲浪印记的文化.滑板爱好者和滑板公园的建设者们一开始建造了不少模拟冲浪的地形.后来,他们终于意识到,由于滑板比冲浪板的阻力小,重量轻,可以建立不同于冲浪而更适合滑板的地形以取得更大的速度、机动性和自我表现能力.
  加州Santa Monica 的“West wind”滑板队把废弃的钥匙孔型泳池作为练习垂直表面滑板的场地,一时间在加州形成了寻找泳池热.从这时起,滑板运动与冲浪运动不仅是从器材、场地,也从人员上,彻底分离出来,成为突起的一支异军.这支新军不涉足冲浪,一心钻研滑板,并开始形成自己的语言、技巧、衣饰风格和音乐爱好.形成了新生的、以城市为主导的滑板次生文化.
  七十年代中期是第三代滑板飞速发展的时期.预感到一种新型的体育运动就要应运而生,无数个由滑板和冲浪爱好者建立的小型滑板公司如雨后春笋般出现,开始在技术质量上展开全面的竞争.聚氨酯轮子的潜力被充分挖掘出来.不断改进的聚氨酯轮子使滑板附着摩擦力加强,速度增加,甚至可以滑上垂直表面.
  此外,对滑板材料的研究开发也达到了穷及一切的地步.硬塑、铝合金、玻璃纤维,甚至高科技的碳素复合材料都被用来试制滑板.最终,抗冲击性能好,重量轻的加拿大糖枫担负起了新一代滑板材料的历史使命.
  另外,由Powell公司发明的跨越大障碍物的聚氨酯轮子和斯蒂文森专利的凹型滑板尾部使第三代滑板更上一层楼.
  80年代末,由于滑板运动本身的发展和滑手们对滑板技巧要求的提高,以及为了适应U型池(vert ramp)双向滑行的需要,一种与前三代滑板形状完全不同的两头翘起、形状对称的滑板出现了,这就是第四代滑板.目前只有滑手们使用的都是第四的滑板.第四代滑板改用硬岩枫重量更轻,弹性更好.滑板轮硬度高,弹性好,更适合高速滑行.由于重量平衡,第四代滑板更适合各种翻转动作.
  九十年代初,滑板运动走入了一个低谷时期.由于正处于滑板换代的时期,滑板从一头改为两头,因而出现了许多前一代滑板不可能完成的动作.这个时期是滑板运动的技巧性动作(technical tricks)时代.滑手们发明了很多新的动作.同时为了使滑板更容易翻转,滑板板面变得很窄,轮子变得很小.这个时期一块典型的滑板宽度只有7英寸,而轮子直径只有39mm左右.这样的滑板虽然更易于做出复杂的动作,但是较小的轮子却妨碍了它的滑行性能.
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  Fifty years in the late nineteenth century, on the other side of the Pacific, at the Edison inventions were the descendants of ancient China to a greater or lesser extent people's fantasies become a reality. The beginning of the fifties the U.S. West Coast is a major test of beach-goers have a place to test their abilities. They use the high cost of ordinary wood and light wood surfboard into waves in the air to find the fun. To the mid-fifties, molded polyurethane foam and fiberglass replaced the wooden surfboard. These new surfboard flexibility and durability make surfing much in popularity at the end of the fifties.
  Surfing skateboarding is an extension of the land. The former by the geographical and climatic conditions, while the latter have greater flexibility. Sunny beaches of Southern California residents in the community quickly produced a piece of the world's first skateboard.
  It seems today, it is a very simple invention: a piece of wood 50 * 50CM iron fixed in the roller wheels. Even such a simple sports equipment, because it can offer the same Surf bring psychological feelings, but also aroused sufficient interest.
  However, this first generation of skateboards as a result of the backwardness of their own (too heavy plate, inflexibility, insensitivity steering, wheels too slippery, etc.) have not been as skateboarding's popularity today, the first slide board skateboarding video in the "prohibited" (Ban This) see.
  No. 2 on behalf of the skateboard was born in 1962. This is made from oak to suppress MLB 15 * 60 cm board, roller bridge and plastic wheels turn composed of. And the first generation of skateboarding, this skateboard is a leap in technology. However, this skateboards-round performance of the plastic is still much to be desired. His force is too small to make the attachment a sharp turn when the out-of-control slide; and his flexibility is low, even if small skateboard obstacles encountered also to hand down to slide. At the same time, he is also poor wear resistance. Nevertheless, this is still slippery slide their hands in general. After all, compared to the previous generation of skateboards, which have a high degree of evolution, a relatively large surface of the plate so that the hands were slippery to stand up and manipulated more easily. China's domestic sales are now the majority of skateboard products this is the second generation.
  In 1973, a man named Frank skateboard enthusiasts纳斯沃西the first time he installed polyurethane skateboard wheels and achieve an unexpected effect. He then began to call this "Cadillac" brand of skateboard wheels sold to his friends. This flexibility not only the wear resistance of the wheels, and skateboarding safety could turn secure, easy to run over small obstacles on the ground. In this way the third generation skateboard invented. As a result of surfing skateboarding derived from reason, the beginning of the seventies skateboard culture is imprinted with the culture of surfing. Skateboard park, skateboard enthusiasts and builders have begun the construction of a simulated surfing a lot of terrain. Later, they finally realized that, because of the surfboards skateboards resistance than the small, light weight, can create different from the surf and the terrain more suitable for skateboards in order to achieve greater speed, mobility and ability to self-expression.
  Santa Monica, California's "West wind" skateboard team abandoned the key to pass the swimming pool as a practice venue skateboard vertical surface, a time to find form in the California heat swimming pools. From that time on, skateboarding and surfing, not only from the equipment, the venue, but also from the staff, the completely separate process to become a new horizon. The new army is not involved in surfing, skateboarding one study, and began to take shape in their own language, skills, clothing and music-loving style. The formation of a new life to city-led secondary skateboard culture.
  The third generation of the mid-seventies was a period of rapid development of skateboarding. A feeling that will be a new type of sports came into being, numerous skateboarding and surfing enthusiasts from the establishment of a small skateboard company like mushrooms appear in the technical quality of the competition to carry out comprehensive. The potential of polyurethane wheels are fully excavated. Continuous improvement to make the polyurethane skateboard wheels attached to enhance the friction, the speed increase, or even slip on a vertical surface.
  In addition, materials research and development of skateboarding has reached the point where the poor and all. Hard plastic, aluminum, fiberglass, and even high-tech carbon composite materials have been used to skateboard trial. Ultimately, good shock resistance, light weight maple sugar in Canada take on a new generation of mission skateboards materials.
  In addition, the company invented by Powell big barrier across the Stevenson patent polyurethane wheels and the rear of the concave so that the third generation skateboard skateboard the next level.
  The late 80's, due to the development of skateboarding itself and sliding on the skateboard in hand skills required, as well as in order to meet the U-Chi (vert ramp) needs two-way slide, a slide with the three generations of two completely different shape tilt, the shape of a symmetrical skateboards, skateboard This is the fourth generation. At present, only slippery hands are used by the Fourth of skateboarding. Slide switch to the fourth generation of hard rock maple lighter weight, better flexibility. Skateboarding round of high hardness, good elasticity, more suitable for high-speed taxiway. Because of the weight balance, the fourth generation is more suitable for a variety of flip skateboard action.
  The early nineties, skateboarder into a low period. As the new generation is in a period of skateboards, skateboards changed from a 2, resulting in a lot of skateboards can not be completed before the generation of action. That period was a skateboarder and action skills (technical tricks) era. Waterloo hands were invented many new moves. At the same time in order to more easily flip skateboards, skateboarding has become a very narrow face plate, the wheel has become very small. This time the width of a typical skateboard, only 7 inches, and wheels about the diameter of only 39mm. Although this kind of skateboard to make it easier for complex movements, but has smaller wheels glide hamper its performance.

介绍滑板(英和中)急 阿精有4道物理难题问问哥哥姐姐们(2)急!急!急!在电视节目中,我们常能看到一种精彩的水上运动,运动员在快艇的牵引下,脚踏倾斜滑板在水上滑行.设滑板是光滑的,滑板的滑水面积是S,滑板 水对滑板懂得作用力为FX垂直与板面,大小为KV^2其中V为滑板速虑(水静止)某运动中水平牵引力作用下板和水面夹角为⊙=37度时滑板匀速直线运动,相应的K=54KG/M入和滑板总质量为105KG求(1), 手指滑板怎么玩啊介绍下手指滑板~没什么 急!求解一道高中物理计算题!滑行运动是一项非常刺激的水上运动,研究表明,在进行滑板运动时,水对滑板的最用力FN垂直于板面,大小为kv^2,其中v为滑板速率(水可视为静止).某此运动中,在水 请详细介绍一下沸点滑板谢谢(比如速度如何,轮子硬度) 科学题 :滑板运动已经成为都市青年最流行、滑板运动已经成为都市青年最流行、最持久的时尚运动.一块滑板是由板面、滑板支架(滑板桥)和四只滑板轮等部分组成,总质量约为5千克,如 滑板和雪橇的区别? 滑板和雪橇的区别? 滑板运动是一项非常刺激的水上运动,研究表明,在进行滑板运动时水对滑板的作用力FN垂直于板面大小为kv ^2,其中v为滑板速率.某次运动中,在水平牵引力作用下,当滑板和水面的夹角为37度时, 单板滑雪运动主要包括高山滑板,自由式滑板和滑板越野是对还是错 滑板中硬度相同的聚氨酯轮和PU轮有什么差别,或者说这两种材料(如果是的话)有什么差别? 滑滑板(翻译英语) 介绍墨子 和 介绍《墨子》急! 滑板运动已经成为都市青年最流行、最持久的时尚运动.一块滑板是由板面、滑板支架(滑板桥)和四只滑板轮等部分组成,总质量约为5千克,如图所示.其中板面是由一块质量约为4千克,体积约 滑板运动是一项非常刺激的水上运动,研究表明,在进行滑板运动时,水对滑板的作用力FN垂直于板面,大小为kv^2,其中v为滑板速率(水可视为静止),某次运动重,在水平牵引作用下,当滑板和水面 压强滑板运动已经成为都市青年最流行、最持久的时尚运动.一块滑板是由板面、滑板支架(滑板桥)和四只滑板轮等部分组成,总质量约为5千克,如图所示.其中板面是由一块质量约为4千克,体 滑板运动中用到的物理知识?