How to make a gyro with square, round and triangular cardboard and toothpicks?

Put the square in the middle, the vertex of the triangle at the bottom and the circle at the top, and string the three together with matches.

Gyroscope is the earliest entertainment tool of Han people, also known as sudra. It is called "Gan Le" in southern Fujian and "Bing Yan" or "Beating an old cow" in the north. The upper half of the shape is round and the lower half is pointed. It used to be made of wood, but now it is mostly made of plastic or iron. When you play, you can wrap it with a rope and pull it hard to make it rotate upright. Or rotated by the elastic force of a spring.

The traditional ancient gyro is roughly an inverted cone made of wood or iron, and the game is split with a whip. There are various materials (such as steel, plastic, etc.). ) and modern modeling (such as detachment). Of course, some "hand-twisted gyros" are very popular. Gyroscope is a toy that teenagers are very familiar with. Popular all over the world. China is the hometown of gyro. A stone gyro was unearthed in the Neolithic site in Xia County, Shanxi Province, China. It can be seen that gyroscopes have a history of at least four or five thousand years in China.

Practical application:

Gyroscope is still loved by many friends because of its changeable gameplay. Gyroscope is not only a toy, its importance lies in that scientists have developed a scientific instrument-gyroscope according to its mechanical characteristics, which is widely used in scientific research, military technology and other fields. There are many kinds of gyroscopes. Here are some common gyroscopes.

Laser gyro: It is an advanced gyro. Its principle is to determine the angle and orientation by using the frequency difference of two beams of light emitted by the ring laser when it rotates. Laser gyroscopes are used for navigation and tracking of ships and aircraft.

Fiber optic gyroscope: Fiber optic gyroscope is a new generation of gyroscope after laser gyroscope, and its principle is similar to laser gyroscope. Compared with laser gyro, fiber optic gyro has no locking problem and does not need precise laser processing in the timely block, so the cost is lower. All countries are striving to develop fiber optic gyroscopes.

Gyroscope is mainly used to measure angle (inclination), speed, orientation and so on. According to different uses, gyroscopes can be divided into rate gyroscopes and gyro inclinometers. Rate gyroscope is mainly used to measure the rotational speed of the measured object to calculate the corresponding data, so as to achieve the purpose of measurement. Gyro inclinometer is used to measure the inclination and orientation of borehole, which is mainly used in mining areas and oil fields.