Gravitational Motion of Masses on Polygons: n=8 to ∞

Click For Summary

Discussion Overview

The discussion revolves around the gravitational motion of point particles placed at the corners of an n-sided polygon, specifically examining the dynamics as n approaches infinity. Participants explore the forces acting on the particles and the implications for their motion and potential energy.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant proposes that the particles will move radially inwards due to symmetry and suggests calculating the potential energy as a function of radius.
  • Another participant expresses concern about the complexity of adding individual forces and seeks guidance on how to approach the problem as n tends to infinity.
  • A later reply questions whether it is possible to find a formula for n and then evaluate the limit as n approaches infinity.

Areas of Agreement / Disagreement

Participants appear to have differing views on the best approach to analyze the problem, with no consensus on a specific method or outcome regarding the motion of the particles as n increases.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the forces and the mathematical steps required to analyze the system as n tends to infinity.

Sakriya
Messages
16
Reaction score
0
Suppose a n-sided polygon. Point particles of mass "m" each are placed in the corners of the polygon. How does the system of particles move if the only force anting between them is gravity? After how much time the bodies collide if n= 8 and n tends to infinity?


Any suggestions are welcome .
this is not homework question.
 
Physics news on Phys.org
Hi Sakriya! :wink:

It's symmetric, so they'll obviously move radially inwards.

Can't you just add all the individual forces?

If you don't fancy that, you could instead start by calculating the PE as a function of radius …

what do you get? :smile:
 
Thanks
Adding individual forces would be very long, using PE it becomes easy...
how should i do it when n tends to infinity
 
Sakriya said:
… how should i do it when n tends to infinity

Can't you just find the formula for n, and let n -> ∞ ? :confused:
 

Similar threads

Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 46 ·
2
Replies
46
Views
5K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 14 ·
Replies
14
Views
2K
  • · Replies 22 ·
Replies
22
Views
3K
  • · Replies 22 ·
Replies
22
Views
2K