# Effect of Spin on the Trajectory of a Kicked Soccer Ball Essay

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Introduction: I chose this project because soccer is one of the things I love to do. Soccer is one of the most popular sports across the whole world. In soccer being able to curve a soccer ball is very helpful for multiple reasons. One reason is to bend a ball around the a wall of players. Second to possibly score an amazing goal. And last of all to make a simple pass around a defender to a teammate. Anybody that plays soccer and enjoys it probably knows about the famous Roberto Carlos free kick. He scored this goal in 1997 against France in preparation for the 1998 world cup. The shot was taken about 30 meters from the net and a tiny bit to the right. He hit the ball so hard that it cleared the wall by a meter. It then …show more content…
Once in motion other unbalanced forces such as gravity, wind, another player, or the goal would alter its course. Newtons 2nd law deals with the relationship between the acceleration of an object, the force applied to it, and the correlation to its mass. This means that the harder a ball is kicked the faster it will accelerate. It also means that a heavier ball would require more force to achieve the same acceleration. Newton' 3rd law states that “for every action there is an equal and opposite reaction.” So when the ball is sitting still it is pushing down on the ground as the ground is equally pushing up on the ball. It also means that when the ball is kicked the ball pushes back with the same force as your foot. Because of this the ball travels in the opposite direction because it has less mass than your foot and leg. A regulation adult soccer ball weighs around one pound and FIFA, soccer's international governing body, ensures that balls weigh between fourteen and sixteen ounces at the start of a match. The ball is pumped to between 8.5 to 15.6 pounds per
Page 2 square inch so that it presents a rigid spherical shape that can be kicked. A player's shoe is only in contact with the ball for 0.05 seconds and a pro player can kick a ball at a speed of 30 meters per second. Many adult amateurs can reach shot speeds of 25 meters per second and youth players between the ages of 10 to 17 can be in the 15 to 20 meters per