angular momentum

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angular momentum

The cross product of the ordinary momentum of a particle and its position vector, running from the axis of rotation to the body whose momentum is being determined.

In absence of external forces, the angular momentum (AM) remains constant; therefore, a rotating body tends to maintain the same axis of rotation. When torque is applied to a rotating body, the resulting change in AM results in precession. Momentum involved in the rotation of a body about an axis is conserved, as is ordinary momentum. Atomic nuclei possess an intrinsic AM known as “spin”, which is measured in multiples of Planck’s constant.

an·gu·lar mo·men·tum

(ang'gyŭ-lăr mō-men'tŭm)
The spin of MR active nuclei, which depends on the balance between the number of protons and neutrons in the nucleus.


the 'quantity of motion' of a body or object. A vector quantity. linear momentum the product of mass and velocity. The change in linear momentum is equal to the linear impulse. conservation of linear momentum in the absence of external unbalanced forces, the total linear momentum of colliding bodies or objects will remain constant. Commonly applied to racquet/ball impacts. angular momentum the product of moment of inertia and angular velocity. conservation of angular momentum in the absence of an external moment (torque), the angular momentum of a rotating body will remain constant. Often applied to low-velocity flight (e.g. gymnastics) to explain how a body can increase or decrease angular velocity by manipulating moment of inertia (e.g. by 'tucking'). trading of angular momentum if, in the absence of an external moment (torque), an object or body is rotating about one axis (e.g. somersaulting) and rotation about another axis is introduced (e.g. tilt), the result will be a rotation about a third axis (e.g. twist) due to the vector nature of angular momentum. transfer of angular momentum can occur from one part of a body to another in the absence of an external moment (torque) (e.g. if one part of a body increases angular velocity, another part must decrease to conserve angular momentum).
References in periodicals archive ?
Simultaneously, the resultant GRF passes anterior to the COM, creating backward angular impulse about the COM to neutralize the forward angular momentum of the body induced by the trip [5,7,9].
From now on, the quantum number m (the canonical angular momentum number) will be considered fixed unless stated otherwise in a explicit way.
In the transfer phase, the strengthening group had a significantly greater change in MEE in the back, compared with the functional group, which showed a decrease in this measure, and greater change in maximum whole body angular momentum.
The solution that I propose is based on the discovery of a novel phenomenon, where instead of transferring spin angular momentum from a neighbouring layer, magnetization reversal is achieved by angular momentum transfer directly from the crystal lattice.
The researchers entangled the particle pair so that two properties--polarization plus orbital angular momentum (the "twistiness" of the photon's trajectory)--were connected.
It's actually down to the conservation of angular momentum.
the level with angular momentum I is displaced relatively to its neighbors with angular momentum I [+ or -] 2.
Inside each M-Block is a flywheel that can reach speeds of 20,000 revolutions per minute; when the flywheel is braked, it imparts its angular momentum to the cube.
These accretion discs are extremely stable from a hydrodynamic perspective as according to Kepler's laws of planetary motion angular momentum increases from the center towards the periphery," explains HZDR's own Dr.
Other topics of the 85 papers include mass distribution and luminosity functions, white dwarfs excepting from the Hyades, the angular momentum of isolated white dwarf stars, the link between RS Ophiuchi and type Ia supernovae, creating white dwarf photospheres in the laboratory, and the frequency of debris disks at white dwarfs.
The secret to the speed lies in how the researchers manipulated the laser signal to form an optical vortex (also known as an orbital angular momentum carrying-beam, or OAM beam), where the light moves in a spiral, rather than a straight beam akin to a laser pointer.
Drivers can tap a portion of the gyroscope's energy to provide additional thrust and still maintain enough angular momentum to stabilize the vehicle.