The causes of banana balls in football, the physical principles of banana balls in football

Platini's first creation was to draw a large arc like a banana by touching the ball with his feet.

The principle of the curve ball: when the football is flying in the air and constantly rotating, because the air has a certain degree because the ball runs in an arc shape, similar to the shape of the banana, it is also commonly known as "banana ball air has resistance,

Also known as "curveball" and "cucumber ball", football technical terms. When the ball is flying in the air and constantly rotating, because the air has a certain viscosity, when the ball rotates, the air rubs against the surface of the ball, and the rotating ball drives the surrounding air layer to rotate together, thus forming the ball to fly forward in the air and make an arc. Because the ball runs in an arc and is similar to the shape of a banana, it is also commonly known as a "banana ball".

Not only football has this kind of ball, but also volleyball and table tennis! It is caused by different cyclones on the upper and lower parts of a sphere or on both sides.

If you eat a banana, you can kick a banana ball.

Kicking the side of the ball vigorously, adding a violent rotation to the football is equivalent to adding force to the football in one direction, because the direction of the afterburner is different from the initial direction of the ball out, so the football in the air under the influence of the force, will produce the deviation of the trajectory. Physics Knowledge...

On the one hand, the air flows backwards towards the ball, and on the other hand, the air around the ball will rotate with it due to the friction between the air and the ball, and the direction of rotation of the ball is the same as that of the ball, and the velocity of the side with respect to the air is smaller than that of the other side. Physics tells us that the higher the velocity of the gas, the lower the pressure.

Since the air flow speed on both sides of the football is different, the pressure generated by them on the football is also different, so the football is forced to turn to the side with a high air flow speed under the action of air pressure.

In table tennis, when a player is chipping or pulling an arcing ball, the path of the ball will change, just like a "banana ball".

The mystery of banana balls.

We know that when the ball is flying in the air, if it not only makes it forward, but also makes it rotate continuously, because the air has a certain stickiness, when the ball rotates, the air will rub against the surface of the ball, and the rotating ball will drive the surrounding air layer to rotate together. If the ball moves in a horizontal direction to the left and rotates clockwise around the axis of the perpendicular paper, the air flow flows to the right with respect to the ball, and the surrounding air circulation, which is also driven by the rotation of the ball, rotates in a clockwise direction. In this way, the velocity of the air above the ball rotates in addition to the translation to the right, and the two directions are the same; Underneath the ball, the translational velocity (to the right) is in the opposite direction to the rotational velocity (to the left), so its resultant velocity is less than the resultant velocity of the air above the ball.

According to Bernoulli's theorem of fluid mechanics, the pressure on the side with greater velocity is smaller than the pressure on the side with less velocity, so the pressure above the ball is less than the pressure below the ball. If the ball rotates quite fast, so that the upward resultant force of the air to the ball is greater than the weight of the ball, then the ball is subject to a vertical upward resultant force in the process of advancing, so that the ball will do a curved motion on one side and one side upwards in the process of horizontal movement to the left, and the ball will turn upward. To make the ball turn left and right, simply rotate the ball around the vertical axis.

It seems that the key is the athlete's footwork at the moment of touching the ball, that is, not only to make the ball forward, but also to make the ball rotate rapidly, different rotation directions, the ball steering is different, which requires the athlete's hard training, in order to practice a set of skillful foot kung fu, only after thousands of tempering, in order to reach the point of perfection. Actually, it's not just football"Banana balls"Table tennis, volleyball, tennis, etc. all use spinning technology to create a variety of erratic and mysterious strange balls, such as curved balls in table tennis and floating balls in volleyball. The principle of banana balls is aerodynamic.

That is, the greater the relative velocity of the sphere and the air, the greater the force on the sphere, and the greater the curvature of the sphere. Suppose you are looking down from directly above the ball (your line of sight is perpendicular to the ground) and the instantaneous direction of the ball's trajectory is perpendicular to your line of sight, and the ball is spinning counterclockwise. The relative friction velocity between the right side of the ball and the air is greater than that of the left side, and the direction of motion of the ball shifts to the left.

The greater the relative friction velocity, the more the ball will be offset, i.e., the greater the arc. This is the radian, and the height is said below. Suppose you are looking from the side of the ball (the line of sight is parallel to the ground) and the instantaneous direction of the ball's trajectory is perpendicular to yours to the left.

If the ball rotates clockwise, the lower part of the ball rubs more against the air than the upper part, and the ball will fall more slowly. It's easier to get around walls (but the ball is slow, giving the goalkeeper too much time to react). Conversely, the faster the ball falls, but it is not easy to go around the wall (but it is a threat).

The inside and outside of the foot rub against the ball to produce rotation, and the banana ball is the foot that gives it a lateral force to rotate, so that the relative velocity of the air on the two surfaces perpendicular to the direction of motion when the ball is in motion is different, so that the ball is rotated and offset by the action of a force.

What causes banana balls to come about? The banana ball of football, then this is playing football, there is a problem with kicking, it is to intersect.

The so-called bai banana ball is a side-spinning zhi ball kicked by the kicker through friction, and thus has an impact on the trajectory version of dao football.

The principle of neutrality is Bernoulli's principle in fluid mechanics: in a fluid system, such as air flow and water flow, the faster the flow velocity, the less pressure the fluid generates.

Combined with the example of a banana ball, when the ball rotates while flying in the air, it will drive the thin layer of air on its surface to rotate at the same time, and the linear velocity of the rotation of the thin layer of air on one side and the forward velocity of the ball are superimposed, so that the oncoming air flow is subject to greater resistance. On the other side, the opposite is true, where the linear velocity of rotation and the forward velocity are weakened, so that the air flow on both sides of the ball is different from the velocity of the ball. According to Bernoulli's principle, one side with a high air velocity forms a low-pressure area and the other side forms a high-pressure area relative to the translational motion of the football. The net result of the pressure difference between the two sides of the ball is that the ball is subjected to a resultant force from the high pressure area towards the low pressure area, which causes the ball to deviate from the original straight motion direction.

If you copy it.

Often ** football ratio.

If you attack the game, you must have seen a direct free kick in front of the penalty At this time, it is usually five or six players on the defending side who form a "human wall" in front of the goal to block the goal route The main penalty player of the attacking side takes a strong shot, the ball bypasses the "human wall", and it looks like it is about to fly out of the goal, but it turns along the arc to go straight into the goal, which catches the goalkeeper off guard and watches the ball enter the gate This is the quite magical "banana ball" Why does football fly in an arc in the air? It turns out that when the "banana ball" is punished, the player does not kick the center of the football with his foot, but slightly deviates to one side, and at the same time rubs the football with the instep of his foot, so that the ball moves forward in the air and constantly rotates At this time, on the one hand, the air flows backwards towards the ball, and on the other hand, the air around the ball will be rotated together due to the friction between the air and the ball In this way, the air on one side of the ball flows faster, and the air on the other side slows down Physics tells us: the greater the flow rate of the gas, The lower the pressure (Bernoulli's equation) Since the air flow speed on both sides of the football is not the same, the pressure they produce on the football is also different, so the football is forced to turn to the side with a large air flow speed under the action of air pressure In table tennis, when the player is chipping the ball or pulling the arc ball, the path of the ball will change, the same as the "banana ball".

Because when the ball is flying at high speed while spinning. Caused by unequal air pressure on both sides. For example, when the ball turns from west to east, the air velocity on the west side of the ball is faster, so the atmospheric pressure becomes smaller, while the air velocity on the east side remains the same, and the atmospheric pressure is larger than that on the west side, and the air pressure pushes the ball westward, so it is generated"Banana balls".

Rub the ball with the instep of your foot to make the ball spin proudly at high speed, and the air pressure on both sides of the ball will change.

The air pressure changes the direction of the ball, resulting in a "banana ball"!

It's kicked out like a banana.

The principle of the curve ball: when the copy football is flying in the air, and constantly rotating, because the air has a certain stickiness, so when the ball rotates, the air will rub against the sphere, and the rotating ball will drive the surrounding air layer to rotate together, and the pressure on both sides is unequal, so as to form the football in the air forward and make an arc flight. Because the ball runs in an arc and is similar to the shape of a banana, it is also commonly known as a "banana ball".

The inside and outside of the foot rub against the ball to produce rotation, and the banana ball is the foot that gives it a lateral force to rotate, so that the relative velocity of the air on the two surfaces perpendicular to the direction of motion when the ball is in motion is different, so that the ball is rotated and offset by the action of a force.

The banana ball is a foot that gives it a lateral force to rotate, so that the relative velocity of the air on the two sides perpendicular to the direction of motion of the ball is not the same, so that the ball is rotated and offset by a force.

(1) The magnitude, direction, and point of action of the force are called the three elements of the force They can all affect the effect, and when one of the elements changes, the effect of the force often changes

In football, players often kick out "banana balls" and "straight balls", which is a change in the route of the ball's movement, if the magnitude of the force changes, the change may only be the distance of the movement, so this is mainly caused by the difference in direction and application point

2) When the football moves forward, the air moves backwards relative to the football, and since the football drives the air to rotate clockwise, the air flow velocity on the left side of the football is less than the air flow rate on the right side The pressure on the left side of the football is stronger than the pressure on the right side of the football because the pressure is strong where the flow velocity is small The pressure on the left side of the football is greater than the pressure on the right side The direction of the resultant force of the gas on the football is to the right, so the football will move along the trajectory C

So the answer is: direction; point of effect; c．

If you're a football fan, you've seen this kind of spectacle: a direct free-kick from near the opposition goal, a defender.

Five or six people lined up"Human wall", trying to block the route of the goal, but the attacking penalty player did not panic, slowly walked forward, put the ball in the right position, and then got up and shot hard, only to see the ball bypassed"Human wall"Seeing that he was about to deviate from the goal and fly out of bounds, but turned the corner and went straight to the goal, the goalkeeper was just about to start to save the ball, but it was too late, and the ball had already entered the net.

This is the magic of banana balls. Because the route of the ball motion is arc-shaped, like a banana shape, hence the to"Banana balls"Name.

Also known as "curveball" and "cucumber ball", football technical terms. When the ball is flying in the air and constantly rotating, because the air has a certain viscosity, when the ball rotates, the air rubs against the surface of the ball, and the rotating ball drives the surrounding air layer to rotate together, thus forming the ball to fly forward in the air and make an arc. Because the ball runs in an arc and is similar to the shape of a banana, it is also commonly known as a "banana ball".

Not only football has this kind of ball, but also volleyball and table tennis! It is caused by different cyclones on the upper and lower parts of a sphere or on both sides.

The force does not pass through the center of the ball.

Causes rotation. Produces an arc.

That is, the ball rotates and moves the air in two directions, forward and backward.

Drive the ball again. This way the ball spins faster and faster.

The arc is born!