Is angular momentum completely independent from linear momentum

Click For Summary
SUMMARY

Angular momentum is fundamentally related to linear momentum, as expressed by the equation $$L = r \times p$$, where L represents angular momentum, r is the position vector, and p is linear momentum. Both types of momentum are conserved in isolated systems, particularly in rigid bodies where angular momentum can be derived from linear momentum. In scenarios involving deformable objects, such as a paddle wheel in non-Newtonian fluids, angular momentum conservation must account for the stored momentum in the medium. To calculate moments of inertia for objects like a uniform hollow cylinder, one must utilize calculus and specific parameters such as density, inner and outer radius, and length.

PREREQUISITES
  • Understanding of classical mechanics principles
  • Familiarity with linear momentum concepts
  • Knowledge of angular momentum equations
  • Basic calculus for integration and moment of inertia calculations
NEXT STEPS
  • Study the derivation of angular momentum from linear momentum in rigid body dynamics
  • Explore the concept of moments of inertia for various geometries
  • Learn about the conservation of angular momentum in non-rigid systems
  • Investigate applications of angular momentum in real-world scenarios, such as fluid dynamics
USEFUL FOR

Students and professionals in physics, mechanical engineers, and anyone interested in the principles of momentum conservation and its applications in both rigid and deformable systems.

NANDHU001
Messages
22
Reaction score
0
Is it possible to derive ideas of angular momentum form linear momentum. Can linear momentum and calculus be used to derive ideas of angular momentum.
 
Physics news on Phys.org
I take it you are talking about classical mechanics?

$$L=r \times p$$
where
L is angular momentum
r is position vector
p is linear momentum

So linear and angular momentum are related. They are each conserved. If we have only rigid objects all the angular momentum follows from linear momentum and we can use either momentum according to convenience. If we have bendy objects they can store angular momentum. For example if we had a paddle wheel and we put it in a pot of non-Newtonian porridge it may appear as if angular momentum is not conserved, but in fact it is, the porridge has stored some angular momentum that must be accounted for.
 
NANDHU001 said:
Is it possible to derive ideas of angular momentum form linear momentum. Can linear momentum and calculus be used to derive ideas of angular momentum.

Sure, a constant horizontal force applied tangentially about an axis of rotation would produce the revolutions per second expressed, preferably, in radians per second.

If you want to find out the moments of inertia, you'd need information about the density of, say, a uniform hollow cylinder about an axis, inner and outer radius, and a length. With that information you can use calculus.

Using integration, you can show the angular momentum of a body expressed as two parts, one from the body's center of mass and one from the motion of the body with respect to its center of mass.
 

Similar threads

Replies
17
Views
2K
Replies
2
Views
1K
Replies
5
Views
1K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 17 ·
Replies
17
Views
1K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 62 ·
3
Replies
62
Views
14K