The ellipsoid of moment of inertia of rigid body around fulcrum is called ellipsoid of rotation, and the moment of inertia of rigid body around symmetry axis is called polar moment of inertia. The principal axis of inertia of a rigid body relative to the other two fulcrums (see inertia tensor? ) is called equatorial moment of inertia. Gyroscope is a rigid body moving around a fulcrum, so the kinematics and dynamics equations of fixed-point motion of rigid body are applicable to gyro.
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.
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Gyroscope should be stored in a cool and ventilated place to avoid cracking in the sun, damp and mildew. If necessary, air conditioners or dehumidifiers should be used to dehumidify the storage places. Iron parts should be oiled and maintained in a timely manner (not too much, so as to avoid easy rope entanglement); If the rope feels hard, it should be soaked in water, washed, beaten (to remove sand and dust) and then dried in the shade.
It is generally believed that playing a gyro is a toy thrown by a wooden gyro, that is, after winding the gyro with cotton rope, throwing the gyro by hand and rotating it around the gyro nail; Besides, in Chinese mainland, some people whip the gyro to keep it spinning.
However, in order to popularize gyro skills and increase learners' learning motivation, some manufacturers adopt other methods (using hats, waste tires, springs, friction principles, single-headed bells, hangers, etc. ) made many novel children's play works related to the gyro, and even added batteries and colorful light bulbs to the gyro to make it rotate and emit colorful light to attract the attention of gyro players.
On the other hand, in order to make the gyro make a loud noise when it rotates, some manufacturers dig the gyro body into a hollow, and there is a long small gap on the side of the gyro, which is special because the gyro can make a buzzing sound when it rotates.
Therefore, through the ingenious thinking of craftsmen, the evolution of the times and the improvement of science and technology, gyroscopes have appeared in various materials and shapes. Therefore, after ingenious thinking by craftsmen, this kind of gyro is not only more interesting and perfect for Xian Yi's young and old.
Baidu encyclopedia-gyro