Tennis: Buy Seigaku For One Dollar, Fire Coach

There was a lot of discussion about Lin Bei in the hotel.

Some people are adoring and admirable, some are curious and excited, some are dissatisfied and provocative, and some are fearful and vigilant.

In short, Lin Bei has become the hottest topic in the hotel.

Lin Bei himself had no idea that he had caused such a big sensation.

He just sat quietly in his room and opened the system interface.

[Product: Beginner Tutorial on Rizhi Rotation, Price: 1 Yuan]

[Product: The complete collection of Prince of Tennis comics (with bonus), price: 1 yuan] [Whether the host wants to buy it]

Lin Bei's eyes flashed with excitement and anticipation.

He has not purchased system products for a long time because he feels that his strength is strong enough and he does not need to rely on external objects.

However, when he saw these two products, he couldn't help but be tempted.

Basic Tutorial on Spin, this is a technique he has always wanted to learn. Although he has been able to imitate some effects of Spin, he knows that he has not yet truly mastered its essence and principles.

If he can systematically learn Li Zhizhi's rotation through systematic tutorials, then his strength will definitely make a qualitative leap.

The complete collection of Prince of Tennis comics (with bonus) is one of his favorite comics and one of the sources of his Let ball.

He has loved reading this comic since he was a child, and is fascinated by the various difficult techniques and exciting duels in it.

Moreover, the system also comes with a special gift. I don’t know what it is, but it is definitely not an ordinary thing.

Maybe it's some secret information, or some special props, or some wonderful secrets.

All in all, Lin Bei thinks both products are worth buying. So, without hesitation, he muttered in his mind: "Buy!" [Successful purchase, the host gets the basic tutorial on rotation, which has been placed in the teaching space of this system]

[The purchase is successful, and the host obtains the complete collection of Prince of Tennis comics (with bonus bonus), which has been placed in the storage space of this system]

In an instant.

Lin Bei felt that there were two new icons on his phone, one was a spinning tennis ball, and the other was a racquet with a smiley face.

He couldn't wait to open the rotating tennis icon and enter the teaching space.

The teaching space is a virtual website with a transparent screen showing tutorial content and demonstration videos. Lin Bei saw that the first lesson was about the definition and principle of Li rotation.

[Rotation: an advanced technology that uses the friction and angle generated when the net racquet contacts the spherical surface to change the direction and arc of the ball....]

[Principle: When the net racquet comes into contact with the spherical surface, a tangential force will also be exerted while exerting normal force. This tangential force will cause the sphere to rotate along the axis of the normal direction of the contact surface. This rotation is the rotation of Li. 】

[Based on the direction and magnitude of the tangential force, the spin can be divided into four types: topspin, downspin, left-spin, and right-spin. 】

[topspin: The tangential force is applied from bottom to top, creating a force above the sphere that pushes the sphere forward. This force will cause the ball to fly faster [and make it bounce higher into the sky after landing. 】

[Backspin: The tangential force is applied from top to bottom, creating a force under the ball that hinders the movement of the ball. This force will slow down the flight speed of the ball 3.7 and reduce the bounce height after landing. 】

[Left-handed rotation: The tangential force is applied from right to left, producing a force on the left side of the sphere that deflects the sphere to the left. This force will cause the ball's flight trajectory to curve to the left, and it will slide to the left after landing. 】

[Dextral rotation: The tangential force is applied from left to right, producing a force on the right side of the sphere that deflects the sphere to the right. This force will cause the ball's flight trajectory to curve to the right, and it will slide to the right after landing. 】.