A childish question, even though I'm an aligator

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Discussion Overview

The discussion revolves around a hypothetical scenario involving a bowling ball placed in the center of the Earth, imagined as a perfect cubic room. Participants explore the implications of gravity in this context, particularly whether the bowling ball would float or fall, and the nature of gravitational forces in such a setting.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that the bowling ball would float at the center due to equal gravitational forces acting in all directions.
  • Another participant points out that the center of the Earth is not a cube but rather a slightly oblate sphere, reinforcing the idea that gravity is equal in all directions.
  • A later reply elaborates that if the ball were slightly displaced from the center, it would oscillate around the center point, indicating a stable equilibrium in a hollowed center of a gravitating body.
  • It is noted that gravitational forces inside a hollow sphere cancel out, implying that the bowling ball would remain in place regardless of its position within the sphere.

Areas of Agreement / Disagreement

Participants generally agree on the concept that the bowling ball would not fall but hover at the center due to gravitational forces, though there are variations in the descriptions of the scenario and the nature of the gravitational field.

Contextual Notes

The discussion assumes a simplified model of gravity and does not account for real-world complexities, such as the actual structure of the Earth or the feasibility of the scenario.

Mozart
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Alright, so I was just thinking the other day about say...a bowling ball in the center of the Earth, where the center of the Earth is sectioned off by a perfect cubic room. Now say the bowling ball was positioned in the center of that room. I was wondering where the bowling ball would fall towards. Would it just float there? Please neglect all the reasons why this experiment would be nearly impossible to perform. Just imagine...

Thank You.
 
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my guess is yes
 
The centre of the Earth will actually be a slightly oblate sphere, not a cube. In any event, gravity is equal in all directions, so the ball will just hover.
 
Danger said:
The centre of the Earth will actually be a slightly oblate sphere, not a cube. In any event, gravity is equal in all directions, so the ball will just hover.

Even better than this, if the ball were to be displaced just slightly from the center it would oscillate about the center point. In other words, the (hollowed) center of a gravitating body is a stable equilibrium point.
 
Parlyne said:
Even better than this, if the ball were to be displaced just slightly from the center it would oscillate about the center point. In other words, the (hollowed) center of a gravitating body is a stable equilibrium point.
As Danger points out, the gravitational forces inside a hollow sphere cancel out - no matter where inside the sphere you put the bowling ball, it will remain there.
 

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