Content Introduction
Name
Corners Conservation Law (Law of Conservation Of Angular Momentum)
Introduction
one of the universal laws of physics. Reflecting the general law of the quality point and the quality point around a point or a shaft movement.
If the external force zero (ie, = 0), L1 = L2, i.e., L = normal vector.
This is to say that the overall torque of the mass point is zero, then the angular moment vector of this mass remains unchanged. This conclusion is called the regular point angle.
Details
Overview
One of the universal laws of physics. For example, a mass of exercise in the heartbowl, has always been heart-hearted by force, because the momentum of the heart is zero, so according to the angular momentum, the mass is conserved. Therefore, the quality point trajectory is a planar curve, and the quality of the center is swept across the equal area in equal time. If the sun looks strong, the planet looks into a quality point, the above conclusion is the second law of Copple of Coppler Planetary Sports. A quality point of the external force or an external field, the interaction between its places, from the third law of Newton, and thus the internal force of the quality point is zero, thereby exporting the corner momentum of the quality point. If the external force of the quality point is to the algebra of a certain fixed axis, it is conserved to the shaft. Corners Conservation is also an important basic law in microscopic physics. In the process of basic particle decay, collision and transition, comply with conservation law reflecting the general laws of nature, and also includes the law of conservation of angle movement. W. Bubble in 1931, in accordance with the conservation of the free neutron decay, there is an anti-miconon production in 1956, it is confirmed by the experiment.
Theorem
is also called momentum matrix.
The theorem of the relationship between angular momentum and torque. For quality points, the angular momentum theorem can be expressed as: the mass of the corner momentum of the fixed point to the time of the time, equal to the moment of force acting on the mass on the point. For the quality point, due to the internal force of the interaction between the various places, the internal force of the quality point is zero. Using this feature of internal force, the corner of the mass point can be derived: the mass of the corner moment of the quality point is equal to the time of time for time to the time of the external force acting on the quality point to the Torque of the o point. Vector and . From
, the angular momentum of the overall rotation characteristics of the main point is only related to the external force acting on the quality point, and the internal force cannot change the overall rotation of the quality point.