How is the Center of Mass Used in Physics Beyond Astronomy?

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Discussion Overview

The discussion explores the relevance and application of the center of mass in various physics subjects beyond astronomy, specifically focusing on its use in electricity, magnetism, mechanics, and other terrestrial phenomena. The inquiry emphasizes three-dimensional shapes.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses curiosity about the applications of the center of mass in fields such as electricity, magnetism, and mechanics on Earth.
  • Another participant notes that the center of mass is not typically used to describe subatomic interactions, where electrons and fields are more common descriptors.
  • A participant highlights the importance of the center of mass in statics and dynamics, particularly in calculating torque for rotating bodies and forces exerted by beams.
  • It is mentioned that in ideal interactions, such as billiard balls colliding, the momentum of the combined center of mass remains constant before and after the collision.
  • A related concept of force, time, mass, and velocity is introduced, linking it to the center of mass in the context of collisions.

Areas of Agreement / Disagreement

Participants present multiple perspectives on the application of the center of mass, with some focusing on its relevance in mechanics while others question its applicability in electricity and magnetism. The discussion remains unresolved regarding the broader implications of the center of mass in these fields.

Contextual Notes

Some assumptions about the applicability of the center of mass in various contexts are not fully explored, particularly in relation to subatomic interactions and specific applications in electricity and magnetism.

shirel
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Hi!

I'm very curious to know how the Center of mass, that I know from Math is relevant for the physics' subjects.

I know already how it affects stars, but I'm interested to know how it is being used in electricity, magnetism, mechanics and other stuff on EARTH :-p

Therefore, I refer to 3D shapes and not 2D.

Thank you very much!
 
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Start here: http://en.wikipedia.org/wiki/Center_of_mass"
 
Last edited by a moderator:
Center of mass isn't generally used for subatomic interactions describing electricity or magnetism. electrons or fields are the common description vehicles.

Center of mass is widely used in the study of statics and dynamics, for example rotating bodies or forces exerted by beams. If you know the center of mass of a steel beam for example, usually the venter of it's length it becomes very easy to calculate it's torque (twist) about some fixed point...Torque = weight (at the center of mass) times the distance ( from the center of mass to the point at which torque is measured)...
 
Thank you both very much!
I'm still waiting for more ideas :)
 
When ideal bodies interact, say a pair of billard balls, the momentum of the balls combined center of mass before they collide equals that after the collision...

A related reaction is FT =MV..force applied x time equals mass x velocity...

Try Wikipedia for things like conservation of momentum, of angular momentum, elastic collisions...also search statics or static forces...
 
Ohh I liked this idea, thanks :)
 

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