Shulou(Shulou.com)11/24 Report--

The original title: "I don't know how to play the National Day holiday." Come to Physics to learn the real art of pulling! | serious play "

Why is table tennis attracted and stuck in the air?

Why are you led by the nose?

And why was it suddenly bounced off?

Today, the editor takes you into the mysterious scene of table tennis.

I'll show you the real pulling art!

Experimental equipment: a ping-pong ball, a rope, a tape and a place where water flows out.

The first step of the experiment: stick the rope to the ping-pong ball through tape (be sure to make sure the bond is strong).

Step 2: turn on the faucet (pay attention to control the flow of water), and then use a thin thread to swing the ping-pong ball into the water, you can see a magical phenomenon: the ping-pong ball is tightly absorbed by the water.

Step 3: when the ball is tightly sucked by the water, loosen the rope or tighten the rope appropriately, and you can see that the ping-pong ball tightly locks the current as if it had found its own object, and the ping-pong ball follows where it goes!

Step 4: when the ball is tightly absorbed by the water, adjust the flow of the faucet, when the speed of the water reaches a certain extent, there is a mysterious phenomenon: the ping-pong ball is bounced off by water.

Step 5: maintain the size of the current that has just been bounced off, and then try to let the current absorb the ball, but you can find that when the ball hits the current, it will bounce away immediately, so love will disappear, right?

The original understanding of the principle that the ball is sucked: the ball itself is streamlined, when there is water flowing through it, because of the pressure of the fluid, the top of the table tennis ball will be under pressure, while the bottom will be attracted, and the two forces interact to make the ball fixed.

The principle that the ball is bounced off: as the current increases, the side of the sphere will be subjected to more and more downward impact. After reaching the critical point of the force, the ball will move in a circle with the radius of the rope and the point where you are holding the rope as the center. Visually, it was bounced off.

Do you understand?

Finally, I wish you all a happy National Day holiday!

This article comes from the official account of Wechat: Institute of Physics, Chinese Academy of Sciences (ID:cas-iop), author: Ah Yi; Xiao p; iu

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