综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

您現(xiàn)在的位置: > En_language tips > 輕松英語 Easy English > 一問到底 Odd Question Dec 26, 2005
 





  Why do golf balls have dimples?

golfball  
Why do golf balls have dimples? Notes:

So that they look cute? NO!

Because the dimples maximize the distance golf balls travel. Dimpled balls travel up to four times farther than smooth-surfaced golf balls.

In the early days of golf, smooth-surfaced balls were used until golfers discovered that old, bumpy balls traveled longer distances. The science of aerodynamics helps explain the dimpled phenomenon. The dimples reduce the drag on a golf ball by redirecting more air pressure behind the golf ball rather than in front of it. The higher levels of pressure behind the golf balls force them to go far distances.

The dimples change the levels of pressure by bringing the main air stream very close to the surface of the golf ball. The dimples, or "turbulators," increase the turbulence in the layer of air located next to the surface of the ball. This high-speed air stream near the ball increases the amount of pressure behind the ball-thereby forcing the ball to travel farther.

 

 

 

 


aerodynamics: 空氣動力學(xué)

 
 
 
枝江市| 青铜峡市| 永登县| 烟台市| 酒泉市| 泊头市| 岳普湖县| 温泉县| 夏河县| 峨眉山市| 美姑县| 永登县| 敖汉旗| 玉山县| 远安县| 平潭县| 富裕县| 庆云县| 龙海市| 洪泽县| 突泉县| 元阳县| 汶上县| 夏河县| 舟山市| 青海省| 利津县| 辽中县| 西安市| 普陀区| 恩平市| 盐池县| 阿巴嘎旗| 和平区| 临朐县| 醴陵市| 福州市| 汉沽区| 峨眉山市| 临澧县| 舒城县|