A gyroscope is a device used for measuring or maintaining orientation and angular velocity. It is a spinning wheel or disc in which the axis of rotation (spin axis) is free to assume any orientation by itself. The gyroscope is composed of a flywheel mass that is driven at high speed by an electric motor. The gyro wheel is mounted on a frame. The frame can be rotated about the vertical axis by a second electric motor. This causes the precession of the gyroscope. Precession means by, the gyroscope exerts a moment, the gyroscopic moment about the horizontal axis.

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