Finding the Cross Product for Angular Momentum

Click For Summary
SUMMARY

The discussion focuses on calculating the angular momentum of a particle using the cross product of its position vector and velocity vector. The formula for angular momentum is established as L = m(r × v), where r is the position vector expressed as r = xi + yj + zk, and v is the velocity vector of the same form. The participant confirms the method for finding the cross product and emphasizes the necessity of multiplying the result by the mass (m) to obtain the angular momentum. This approach is grounded in fundamental physics principles.

PREREQUISITES
  • Understanding of vector mathematics, specifically cross products.
  • Familiarity with the concept of angular momentum in physics.
  • Knowledge of basic physics equations, particularly L = mvr.
  • Ability to manipulate vector components in three-dimensional space.
NEXT STEPS
  • Study the properties and applications of the cross product in vector calculus.
  • Explore detailed examples of angular momentum calculations in different physical scenarios.
  • Learn about the implications of angular momentum conservation in closed systems.
  • Investigate the relationship between angular momentum and rotational dynamics.
USEFUL FOR

Students studying physics, particularly those focusing on mechanics, as well as educators and anyone interested in understanding the mathematical foundations of angular momentum calculations.

mrshappy0
Messages
97
Reaction score
0

Homework Statement


For the general case. I need help finding the cross product for the angular momentum. Say you have a particle at a position r= xi+yj+zk with a velocity of xi+yj+zk and a known mass. How do you find the angular momentum?


Homework Equations


L=mvr


The Attempt at a Solution



So I know how to find the cross product of r and v. It will be some xi+yj+zk. Then how do you find the angular momentum from there?
 
Physics news on Phys.org
Do a Google search on cross product. Wikipedia will show you how.
 
Since angular momentum is [itex]L = \vec{r} \times m\vec{v}[/itex] and you know how to find [itex]\vec{r} \times \vec{v}[/itex] just multiply by m
 

Similar threads

  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 17 ·
Replies
17
Views
1K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
67
Views
5K
Replies
335
Views
17K
Replies
3
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 15 ·
Replies
15
Views
2K
  • · Replies 9 ·
Replies
9
Views
4K
Replies
23
Views
2K