As anyone who has played a round of golf will attest to, the sport is based around many fundamental principals of physics. These basic laws are involved with every aspect of the game from how a player swings the club to how the ball moves through the air on its way toward the pin. It is the challenge that physics presents to the golfer that has allowed the game, and equipment used, to develop so drastically over the past one hundred years. The first golf balls used were called featheries. They were made with a horsehide cover packed with wet goose feathers. When the balls dried they became extremely hard. The major flaw with the featheries was that they could not be used when the conditions were wet because they would soften again. Despite the flaw of the featheries, they remained the only ball used up until the middle of the 19th century when the revolutionary gutta-percha ball was invented. The new ball, sometimes referred to as a “guttie” was molded from the warmed, dried gum of the sapodilla tree. These balls were cheap to manufacture and opened up the game of golf to a more diverse socio-economic group. This in turn made the game of golf very popular, which led to dramatic improvements in golf balls in t
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Before delving into the details of the golf stroke, it is important for one to consider the general concepts of motion that control the swing of the golf club. According to the conservation of momentum principal, with any given club and any given ball, the speed of the ball depends directly on the speed of the club head. This allows the ball to spring away at a tremendous velocity, which is also based on the principal of conservation of momentum. First, one must consider where the energy for the stroke comes from. The next logical step in the explanation of the physics surrounding a game of golf is to relate the two aspects just discussed. <1> This all happens in less than a thousandth of a second while the club head moves less than an inch. Like velocity, momentum, has a direction as well as magnitude, making it a vector quantity. The combination of mass and its distribution in the body is called its “moment of inertia? When the axis of rotation of the body is chosen such that more of the mass is far from the axis, the moment of inertia will be larger. Not only was this ball cheap to manufacture, but also it could be hit farther than any other ball previously used. He found that the ratio of the speed with which the ball leaves the floor to that with which the ball approaches the floor to be practically a constant over a large range of speeds. For a ball that does not rebound at all, the coefficient would be zero. The other two illustrations show a three-dimensional (on the top) and a two-dimensional (on the bottom) view of some of the vectors involved with the flight of a golf ball. It was setup so that it gave the total kinetic energy of the arms and the club and the kinetic energy of each of them separately. From effective loft of the club, one can estimate the components of drag and lift on the golf ball. Yards 160 170 180 190 200 210 220 230 Stroke Lost to par 15 12 9 7 5 3 1 0 The physics surrounding a game of golf is not just based on the swing as shown above.
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