If it's junior high school. Then you have to add three dimensions. Because the eccentric gyro swings when it rotates, it turns out to be a vertebral body.

Now primary school students' math books are equipped with learning tools, usually plastic or cardboard, various numbers, shapes, operation symbols and so on. This learning tool must have round slices or slices that can be cut into circles, and a small stick with a pointed or round head that can be used by important official.

Insert the shaft into the middle of the small disk (preferably a small stick with edges, which is not easy to loosen when inserting), randomly point a few colored dots on the disk, and twist the upper end of the small stick to make it loose and rotate by itself.

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.

Reference to the above content: Baidu Encyclopedia-Gyroscope