Property that describes the rotary inertia of a system in motion about an axis. It is a vector quantity, having both magnitude and direction. The magnitude of the angular momentum of an object is the product of its linear momentum (mass math.m × velocity math.v) and the perpendicular distance math.r from the centre of rotation, or math.mmath.vmath.r. The direction is that of the axis of rotation. The angular momentum of an isolated system is constant. This means that a rigid spinning object continues to spin at a constant rate unless acted upon by an external torque. A spinning gyroscope in an airplane remains fixed in its orientation, independent of the airplane's motion, because of the conservation of direction as well as magnitude.
Learn more about angular momentum with a free trial on Britannica.com.
Patent Issued for Angular Velocity Detection Circuit, Angular Velocity Detection Apparatus, and Failure Determination System
Dec 26, 2012; From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventor Sato, Kenji (Matsumoto, JP), filed on...