国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

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)

 
 
 
十堰市| 策勒县| 扶绥县| 和林格尔县| 璧山县| 宁津县| 潜江市| 曲阜市| 沛县| 西青区| 柘荣县| 拉孜县| 霍州市| 许昌市| 秀山| 龙泉市| 大竹县| 垣曲县| 汉川市| 南开区| 洪江市| 曲沃县| 金寨县| 广德县| 蒙阴县| 洛阳市| 南乐县| 钟祥市| 潮安县| 甘洛县| 瓮安县| 叙永县| 乌鲁木齐县| 赤壁市| 隆昌县| 晴隆县| 炉霍县| 茶陵县| 万宁市| 大足县| 舞钢市|