Definitions for **"Angular Momentum"**

Refer to " Why do Pulsars Spin?"

Product of the moment of inertia of a body and its angular velocity.

A quantity related to the speed and mass of a rotating object

Rotating momentum, as shown, for example, in Earth's daily rotation around its axis.

In Newtonian mechanics the angular momentum (or moment of momentum) about a point O of a body with linear momentum is the vector cross product where is the position vector of the body relative to O. In the absence of a net torque, angular momentum is conserved. But angular momentum is a more fundamental quantity than that defined by this equation. For example, photons have intrinsic angular momenta (spin), which can be transferred to objects (as evidenced by radiation torque), and yet the photon has zero rest mass. Thus, angular momentum is best looked upon as a single entity, complete in itself, governed by the dynamical law where is the torque acting on the body with angular momentum . In meteorology, it is conventional to deal with angular momentum per unit volume, which is given by the product , where Ï is the density and the velocity. Compare momentum, relative angular momentum, absolute angular momentum.

the cross product of the distance an object is from a point and its momentum with respect to this point.

The product of an object's mass, speed, and radial distance of rotation.

For a particle in a spherical orbit, the product of the mass of the particle times its velocity times the radius of the orbit.

Measure of the quantity of rotation possessed by a spinning body about an axis or external point.

An object's moment of inertia multiplied by its angular velocity.

The product of the polar moment of inertia of an object, measured from the instantaneous center axis of spin, the square of the rotational velocity of the object about the instant center axis, and the 3-component direction vector oriented along the instant center axis in the direction predicted by the right hand rule of spin vectors. It is much more complex than simple Linear Momentum. Angular momentum ("H") H = ( 1 / 2 ) * J * ( w ^ 2 ) Where: H = instantaneous angular momentum vector J = polar moment of inertia about spin axis w = instantaneous rotational velocity vector in rad/s Normally expressed in Cartesian vector form having both direction and magnitude H = 10000i + 0j + 0k Because this represents energy, the units are Joules.

The result of the momentum of a rotating body and its distance from the axis of rotation.

The product of the rotational inertia of a body and its angular velocity.

A measure of the tendency of a rotating body to continue rotating. Mathematically, the product of mass, velocity, and radius.

A measure of the momentum associated with motion about an axis or fixed point.

The quantity of rotation of a body, the product of its moment of interia and angular velocity.

rotational analogue of momentum, in units of mass*length2/time (see rotational kinematics)

the product of linear momentum and the distance from the mass to the axis of rotation

A quantity obtained by multiplying the mass of an orbiting body by its velocity and the radius of its orbit. According to the conservation laws of physics, the angular momentum of any orbiting body must remain constant at all points in the orbit. Thus planets in elliptical orbits travel faster when they are closest to the Sun, and more slowly when farthest from the Sun. A spinning body also possesses spin angular momentum.

An object's momentum when that object follows a path around a fixed point, such as an axis. See also momentum below.

A property that an object, such as a planet revolving around the Sun, possesses by virtue of its rotation or circular motion. An object's angular momentum cannot change unless some force acts to speed up or slow down its circular motion. This principle, known as conservation of angular momentum, is why an object can indefinitely maintain a circular motion around an axis of revolution or rotation.

A quantity obtained by multiplying the mass of an orbiting body by its velocity and the radius of its orbit. According to the laws of physics, the angular momentum of any orbiting body must remain constant at all points in its orbit; that is, momentum cannot be created or destroyed. If the orbit is elliptical, the radius will vary; and since the mass is constant, the velocity must change. Thus planets in elliptical orbits travel faster at perihelion and more slowly at aphelion. A rotating body also possesses angular momentum in its spin.

A measure of the mass, radius, and rotational velocity of a rotating or orbiting body. In the simple case of an object in circular orbit, the angular momentum is equal to the mass of the object times its distance from the center of the orbit times its orbital speed. A to F | G to L | M to R | S to Z

The momentum of rotation about a fixed axis.

For a particle, the cross product of the vector from a specified reference point to the particle and the particle's linear momentum; for an assembly of particles, the sum of the individual angular momentums.

a vector quantity given by the vector product of the momentum of a particle and its position vector. In the absence of external forces, the angular momentum remains constant, with the result that any rotating body tends to maintain the same axis of rotation. When a torque is applied to a rotating body, the resulting change in angular momentum results in precession. Atomic nuclei posses an intrinsic angular momentum referred to as spin, measured in multiples of Planck’s constant.

quantity associated with how an object move around a reference point. It is often used to describe rotating objects. The angular momentum of an object is defined to be equal to its mass times its velocity about the point times its distance from that point.

Measure of the rotation of the body around some point.

The product of a body's moment of inertia and its angular velocity.

for a solid body rotating about one axis, it is the product of the rotational angular speed by the mass of the body.

the energy of motion of a spinning body or mass of air or water.

a measure of the amount of spin or orbital motion an object has. It is proportional to the mass of the object multiplied by its radius multiplied by its spin or orbital speed.

The measure of a body's tendency to continue rotating about its axis.

The tendency of an object to keep spinning or moving in a circle.

In physics, the angular momentum of an object rotating about some reference point is the measure of the extent to which the object will continue to rotate about that point unless acted upon by an external torque.