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)

 
 
 
长海县| 满洲里市| 临湘市| 德化县| 务川| 永城市| 万全县| 沅江市| 玉田县| 蓝山县| 阿荣旗| 西平县| 仁布县| 喀喇沁旗| 宁明县| 焉耆| 奉新县| 通江县| 唐山市| 邳州市| 龙川县| 古交市| 禹城市| 江北区| 宝鸡市| 宁蒗| 阿拉善右旗| 福泉市| 九台市| 长丰县| 鲁山县| 兴安县| 崇州市| 盐津县| 措勤县| 汽车| 长春市| 大石桥市| 兴国县| 金寨县| 阳谷县|