angular momentum

noun

, Physics.
1. the product of the moment of inertia of a body about an axis and its angular velocity with respect to the same axis.

angular momentum

noun

1. a property of a mass or system of masses turning about some fixed point; it is conserved in the absence of the action of external forces

angular momentum

/ ănggyə-lər /

1. A measure of the momentum of a body in rotational motion. The angular momentum of rigid bodies is conserved; thus, a spinning sphere will continue to spin unless acted on by an outside force. Changes in angular momentum are equivalent to torque . In classical mechanics, angular momentum is equal to the product of the angular velocity of the body and its moment of inertia around the axis of rotation. It is a vector quantity; the vector points up along the axis of counterclockwise rotation. In quantum mechanics, the angular momentum of a physical system is quantized and can only take on discrete values.

Word History and Origins

Origin of angular momentum1

First recorded in 1865–70

Example Sentences

The tail, it turned out, regulated angular momentum and efficiency, reducing the muscular strain on the dinosaur’s body.

The materials are made up of particles with spin, a quantum version of angular momentum, which makes them magnetic.

Such collisions are well-understood for normal particle beams, but not for those with orbital angular momentum.

Astronomers realized that in 1977, the planets would line up in such a way that a spacecraft launched that year could reach Jupiter, Saturn, Uranus and Neptune one by one, stealing a little angular momentum from each world as it went along.

The team measured how electrons scattered differently from the nucleus according to their spin, or angular momentum.

When it came around again, he would be able to compute the angular momentum of the gigantic rock.

Angular momentum one point one times ten to the twenty-first gram centimeters squared per second.

The elimination of ψ between the equation of conservation of angular momentum about the vertical, viz.

I writhed and squirmed and made every use of the law of conservation of angular momentum until I had my back to Nelly.

The second general result is the Principle of Angular Momentum.