The Keeper of Lost Causes: Concepts in Physics
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When we put the ball on the grass it stays in its place, namely it stays in zero motion since no force is applied to it. However, after we kick the ball, it will continue moving in the direction we kicked it. Its speed will drop gradually, due to friction a force applied on the ball in the opposite direction to its motion , but the direction of its motion will remain the same.
Two things happen when we pass a ball by kicking it with the side of the shoe.
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On one hand, our ability to provide the ball with a strong momentum that will drive it to a far distance is relatively limited. When we toe-kick a ball, however, the kick is stronger but less accurate.
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The difference between the toe kick and the side kick resembles the difference between stepping on a single nail and laying on a bed of nails. In the first scenario, the force of our weight is focused in one spot; while in the second, it is distributed over a large area, which is less painful.
Of course it is! Kicking at the center of the ball will send it moving in a straight line, and it will roll on the grass until friction causes it to stop. Kicking any other area of the ball will cause it to spin on its axis, according to the location of the kick. Kicking the top part will cause the ball to spin forward, and kicking the bottom part will cause it to spin backward.
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In any case, within a short time, the force of friction exerted on the ball by the grass will cause it to spin forward. If we kick the ball on the side and a bit towards the bottom, a wonderful thing happens: In the beginning it will fly exactly in the direction of the kick, and as it slows down due to friction with the air, the spinning motion will cause the air on one side to move faster than that on the other side.
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The ball will then change its direction and will turn either left or right, depending on the side we kicked the ball at. Another example for this is given by a player in another game: In this case, as before, the player kicked the ball very strongly, with a side spin, which turned an almost completely flat kick into a banana kick that scored him a goal.
Could a strong-enough banana kick make the ball complete a full round and return? No matter how strong and acurate the kick is, as the ball moves through the air the friction slows it down, causing the radius of the turn to become smaller and smaller.
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The ball can theoretically go in smaller and smaller circles, but in order to do that it has to spin extremely fast around its axis; much faster than any human play can kick it. Written for the non-science significant, this article emphasizes smooth physics and the medical process—and engages scholars via drawing connections among physics and daily adventure.
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