Type of curvature of gradient force from edge to center of a sphere

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Discussion Overview

The discussion revolves around the nature of a curve generated by the gradient force acting on a sphere resting on a table. Participants explore whether the curve is hyperbolic, parabolic, or a section of an ellipse, and they consider the implications of their findings in the context of physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant presents a set of ordered pairs derived from a physical scenario involving a sphere and queries about the type of curve they represent.
  • Another participant suggests that the original poster should plot the curve and share their thoughts on it.
  • A participant expresses uncertainty about whether the curve is hyperbolic, parabolic, or elliptical, noting that they suspect it is a parabola but are unsure how to confirm this without further analysis.
  • A later reply provides a quadratic regression analysis indicating that the points closely fit a parabolic equation, with a high R² value suggesting a strong correlation.
  • The same participant expresses curiosity about why the gradient force translates into a nearly perfect parabola and indicates a desire to investigate further.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the type of curve, with some suggesting it is a parabola while others remain uncertain and consider alternative possibilities. The discussion reflects differing viewpoints on the interpretation of the curve's nature.

Contextual Notes

The discussion does not resolve the question of the curve's classification, and limitations in the analysis, such as assumptions about the physical scenario and the nature of the curve fitting, are present but not explicitly addressed.

Sedemichra
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I was doing some simple physics with a ball resting on a table and I made this curve

(0,0) (25, 6.8) (50, 27.51) (75, 63.4) (100, 112.34) (125, 175.7) (150, 253.3) (175, 345.4)

I was wondering if anyone could identify what sort of curve it is? I am just curious.

This is not a homework problem.
 
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Sedemichra said:
I was doing some simple physics with a ball resting on a table and I made this curve

(0,0) (25, 6.8) (50, 27.51) (75, 63.4) (100, 112.34) (125, 175.7) (150, 253.3) (175, 345.4)

I was wondering if anyone could identify what sort of curve it is? I am just curious.

This is not a homework problem.

Why can't you plot this out, post it here, and tell us what you think?

Zz.
 
I got the points off of a curve that developed due to the the apparent force of gravity pushing a sphere down on a table...I can't tell if it is hyperbolic or parabolic...or maybe a section of an ellipse(if that's even different)...I have seen the curve and I am guessing it is a parabola but I am not sure how to be certain because I could do a quadratic regression in my calculator but that wouldn't really prove anything would it?
 
Here is a picture of the curve

gYVPr66.jpg


Hyperbole, Parabola, or a section of ellipse I can't tell the difference
 
I did a curve fit on Excel
The ordered pairs you gave at the beginning lie very close to a perfect parabola:
y = 0.011329238095238*x^2 - 0.009373809523815*x - 0.037083333332703
with R^2 of 0.999997
 
Khashishi said:
I did a curve fit on Excel
The ordered pairs you gave at the beginning lie very close to a perfect parabola:
y = 0.011329238095238*x^2 - 0.009373809523815*x - 0.037083333332703
with R^2 of 0.999997

Thanks man, I wonder why the force over the gradient of the circle translates proportionally into a practically perfect parabola?

I will have to do some more investigating!

Thanks again for your reply.
 

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