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| Introduction to angular momentum ： ウィキペディア英語版 |
Angular momentum
In physics, angular momentum (rarely, moment of momentum or rotational momentum) is the rotational analog of linear momentum. It is an important quantity in physics because it is a conserved quantity – the angular momentum of a system remains constant unless acted on by an external torque.
Angular momentum is related to the rotation or revolution of matter. It is often considered to be a measure of the quantity of rotation of a system of matter, taking into account its mass, rotations, motions and shape. The conservation of angular momentum explains many observed phenomena. For example, the increase in rotational speed of a spinning figure skater as the skater's arms are contracted, the high rotational rates of neutron stars, the falling cat problem and precession can all be explained in terms of angular momentum conservation. It has numerous applications in physics, engineering and everyday life, for instance, the gyrocompass, control moment gyroscope, inertial guidance systems, reaction wheels, tops, flying discs or Frisbees and Earth's rotation.
== Angular momentum in classical mechanics ==
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