what is an angular momentum?

Answer 1

a particle moving round a circle has its ang momentum about the centre perpendicular to velocity (v) & distance (r)
from the centre i.e. l=m(v*r)

Answer 2

Recall for linear motion that we introduced the concept of (linear) momentum, mass x velocity, by equating the force exerted on an object to the change in the object's momentum. An analogous quantity called angular momentum can be introduced in the same way. For an object rotating about an axis, the angular momentum is defined as






which leads to the net torque exerted on the object being expressed as








Conservation of linear momentum is a powerful tool in analyzing, for example, collisions between objects undergoing linear motion. Similarly, conservation of angular momentum is very useful in many situations. Consider again the ice skater spinning around. If she draws her arms inwards, she decreases her moment of inertia. Conservation of angular momentum requires that the skater's moment of inertia times her angular velocity remain constant. Thus if her moment of inertia decreases, her angular velocity must increase, and this is what we observe: when the skater pulls in her arms, she immediately starts to rotate faster.

It is also worth noting that just like linear momentum, conservation of angular momentum is associated with a symmetry of the laws of physics. In this case, the relevant symmetry has to do with rotations about any axis.

Answer 3

Angular momentum is the rotational analogue of linear momentum. Linear momentum is just mass times velocity. Angular momentum is the cross product of linear momentum with the radius of the moving object about an origin.

Answer 4

the angular momentum of an object with respect to a reference point is a measure for the extent to which, and the direction in which, the object rotates about the reference point. In lay terms, angular momentum can be thought of as the "amount of rotation" of the body.

In particular, if the body rotates about an axis, then the angular momentum with respect to a point on the axis is related to the mass of the object, the velocity and the distance of the mass to the axis.

Angular momentum is important in physics because it is a conserved quantity: a system's angular momentum stays constant unless an external torque acts on it. Torque is the rate at which angular momentum is transferred in or out of the system. When a rigid body rotates, its resistance to a change in its rotational motion is measured by its moment of inertia.

Angular momentum is an important concept in both physics and engineering, with numerous applications. For example, the kinetic energy stored in a massive rotating object such as a flywheel is proportional to the square of the angular momentum.

Refer to the following link :- http://en.wikipedia.org/wiki/Angular_momentum

Answer 5

When an object has a lot of momentum, a large force is needed to change its motion. Angular momentum describes the momentum of a rotating object. You need to apply a force not only to change the speed of the rotating object, but also to change the direction it is facing

Answer 6

When a body moves in a circular motion it posses a momentum called angular momentum

Answer 7

angular momentum can be thought of as the "amount of rotation" of the body.
Definition
Angular momentum of a particle about some origin is defined as:

L=rxp
where

L is the angular momentum of the particle,
r is the position of the particle expressed as a displacement vector from the origin,
p is the linear momentum of the particle

Answer 8

Angular momentum is the force of friction in the angle of application and the mass of the object.

Answer 9

it is the analogus of linear momentum in rotatory motion.actually torque is the rate of change of linear momentum.since every particle is at different distance from the axi of rotation hence it is not wise to consider all particles of same mass and velocity to have same tendency thus we add also the distance fromm the axis thereby calling it angular momentum

Answer 10

it is the measure at which an object rotates and direction of rotation relative to a reference point