Visualizing Tangent Vectors on a Sphere: How to Interpret Geometrically?

  • Context: Undergrad 
  • Thread starter Thread starter Daveyboy
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the geometric interpretation of tangent vectors on a sphere, specifically in the context of a curve defined by a function from R1 to R3 that maintains a constant distance from the origin. Participants explore the implications of the dot product of the tangent vector and position vector being zero.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests visualizing the tangent vectors as being perpendicular to the position vector, indicating a relationship to a specific surface.
  • Another participant proposes that the curve could be a sphere, while also considering the possibility of it being a circle.
  • A later reply affirms the idea of a sphere but notes that the curve does not necessarily have to be a circle.

Areas of Agreement / Disagreement

Participants generally agree on the connection to a sphere, but there is some contention regarding whether the curve must be a circle or if other forms are possible.

Contextual Notes

The discussion does not resolve the specific nature of the curve beyond its relation to a sphere, leaving open questions about the definitions and assumptions involved.

Daveyboy
Messages
57
Reaction score
0
Hi,

I'm trying to get an idea of what this is in my head but I do not have mathematica handy.

f:R1 to R3
|f(t)|=1
and f'(t)f(t)=0

should I just imagine these as being two tangent vectors.
 
Physics news on Phys.org
If that is a dot product, you should already know of a common simple curve whose tangent lines are always perpendicular to the position vector of the curve. The fact that the length of the position vector is a constant should tell you that the curve is a subset of a particular common surface.
 
Me thinks sphere.
 
Yous thinks right.

Well, circle I think, actually.
 
The sphere is the right idea. Note that the curve does not need to be a circle.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 26 ·
Replies
26
Views
7K
  • · Replies 21 ·
Replies
21
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K