Warping Spacetime: Classical Physics & Relativity

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Discussion Overview

The discussion revolves around the concept of how physical bodies warp spacetime according to classical physics and Einstein's theory of relativity. Participants explore the implications of gravitational attraction between ordinary objects and the potential for detecting spacetime warping effects, particularly in relation to light bending.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant suggests that all physical bodies, regardless of size, warp spacetime and questions whether this effect could be detected through light bending.
  • Another participant agrees with the idea that every physical body could warp spacetime but emphasizes that the effect is practically undetectable for ordinary objects, suggesting that it could be detected in principle.
  • A different viewpoint notes that the gravitational attraction between small objects, like people, can be calculated and is detectable with sensitive instruments, although the effects are very small.
  • It is mentioned that a common school exercise involves calculating the gravitational effect between people-sized objects at room-sized distances, indicating that such calculations are part of educational discussions.

Areas of Agreement / Disagreement

Participants express a mix of agreement and differing perspectives regarding the detectability of spacetime warping by ordinary objects. While some acknowledge the theoretical possibility, others highlight practical limitations, leaving the discussion unresolved.

Contextual Notes

Limitations include the practical challenges of detecting spacetime warping effects from small masses and the dependency on specific conditions for gravitational calculations.

Aikiman007
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Based on classical physics all things attract one another due to their own gravity pull, so theoretically the Earth is drawn closer to a tennis ball even if its impossible to detect. Knowing this and Einsteins theory of relativity of spacetime could I not assume then that every physical body actually warps spacetime no matter how minute and could actually be detected with bending light? Or is spacetime something associated to massive heavenly bodies instead and not small ones like my human form?
 
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Aikiman007 said:
could I not assume then that every physical body actually warps spacetime no matter how minute and could actually be detected with bending light?
You could, and you would be right if you were to add the qualification "could in principle be detected". In practice, the effect is far too small to detect when working with ordinary objects or something like a human body. It would be a good exercise to calculate just how small the Newtonian gravitational attraction between two people standing on opposite sides of a room is - the light-bending predicted by general relativity will be of similar magnitude.
 
Aikiman007 said:
Based on classical physics all things attract one another due to their own gravity pull, so theoretically the Earth is drawn closer to a tennis ball even if its impossible to detect.
The force is easily detectable with a small scale.
 
As a matter of fact, a common school exercise has the student calculate the gravitational effect between people-sized objects at room-sized distances.
 

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