The high jump, unlike many modern Track & Field events, does not have roots in the Ancient Olympiad. Rather, its first recorded event took place in 19th century Scotland. (Though there were similar events in the Olympiad and it is contested that the high jump has been occurring since ancient Greece, the Scottish version was almost identical, if not more elementary, than the jump of today.) In the good old days, jumpers gained momentum and strength by scissoring over the bar.
Today the high jump is taken on in a much more technical fashion. The bar is set at a predetermined height and jumpers attempt to clear the bar. There are special high jump shoes with spiked heels used for gaining additional traction in the run up to the foul line. The approach to the bar is often more important than the actual take off. If you approach at the wrong angle or run without enough force, clearing the bar is more of a challenge. Jumpers run at an angle of 30-40 degrees, and it takes between 8 and 13 strides to get to the jumping line. There are many different styles of jumping. The most popular is the Fosbury flop, but there are also western rolls and straddle techniques. All use centripetal force to hoist the body over the bar.
As with most track events, jumpers have three attempts at each height. Heights are raised 2 cm after each round, and only those who clear the bar move on to the next round. The winner is he or she who clears the tallest height. If there is a tie, the winner is he who has the fewest failed attempts at that height.
What Are Golf Balls Made Of That Make Them Go So Far?
In the chemistry of air pressure, turbulence, and aerodynamics, surface structures are vital physical element. History has it that there are things that seem to be peculiar on their make-up hundreds of years ago which eventually came up with a better composition based on scientific research. And a golf ball is the best paradigm of this theoretical stand in history.
During the earliest days of golf on the eastern coast of Scotland, most players used ancient apparatus in order to play the game in a more disorganized and informal way. Here, the first clubs and golf balls are made up of wood.
It was on 1618 that the feather golf ball was finally introduced. This was commonly known as the "Featherie". This feather golf ball was a handcrafted ball made with goose feathers securely pressed into a horse or cowhide sphere. This is being done while the ball is still wet. After drying, the leather shrank and the feathers expanded creating a hardened ball.
But because these kinds of golf balls are specially handcrafted, they usually cost higher than the clubs. In doing so, only a few privileged people could afford to play golf during those times.
Next, came the Guttie golf ball. This prehistoric kind of golf ball was Made From the rubber like sap of the Gutta tree that can be found in the tropics. Normally, these Guttie balls can be easily shaped into a sphere when hot and eventually used as a golf ball. With its rubber nature, guttie balls can be cheaply reproduced and can be easily repaired by reheating and reshaping.
However, between the two earliest forms of golf balls, the feather golf ball was said to travel farther than the gutties. This is due to the smooth surface of the gutties that limits the capacity of the golf ball to cover more distance.
With this new scientific analysis, the developers of golf ball finally came up with balls with the "dimples" that are predominant in modern golf balls nowadays.
Dimples are crafted into golf balls so as to reduce the aerodynamic drag, which will be acting on the ball if it were totally smooth. This is because smooth balls, when sailing through the air, leave a huge pocket of low-pressure air in its stir therefore creating a drag. With the application of drag, the ball slows down.
Hence, by having dimples on golf balls, the pressure differential goes down and the drag force is reduced. These dimples create turbulence in the air surrounding the golf ball. This, in turn, forces the air to clasp the golf ball more closely. By doing so, the air trails the warp created by the ball towards the back instead of flowing past it. This results to a smaller wake and lesser drag.
Dimples also help players to put backspin on a shot making the golf ball break off on the putting green.
The idea of putting dimples on golf balls can be traced back during the gutta percha phase. Coburn Haskell introduced the one-piece rubber cored ball encased in a gutta percha sphere. It was during this time when the players observed how their shots become more and more predictable as their balls turned rough from play.
When William Taylor applied the dimple pattern to a Haskell ball in 1905, golf balls finally took their modern form.
From then on, dimpled golf balls were officially used in every golf tournament. In 1921, the golf balls took its form with standard size and weight.
Today, there is an abundant selection of golf balls to fit different golf game and condition. There are golf balls that offer control, while some offer distance. In whatever ways golf balls vary, only one thing is common and known. Golf balls are not just elements of the sports arena; they are more than ever paradigm of a concept in physics.
About the Author
Gregg Hall is an author living in Navarre Florida. Find more about this as well as logo golf balls
at http://www.personalizedgolfballsplus.com
What is the best way to shave my balls?
I want to shave my "happy trail" and balls (testicles) but I'm worried. I'm scared of bleeding, cutting myself cause I can't really see them. Anyone have ideas.
lol ya i did this allot with my freaky ex wife. get a HIGH end razor- Quatro. and just lift the sack and go slow. use shaving cream. gonna take a while. just go slow. its gonna itch like hell but boy does it feel great for a day in bed!!!
Headbangers Ball Trail Of Noise With Anthrax Part 1 of 5 1993
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