Understanding the concept of the effects on an orbit

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Homework Help Overview

The discussion revolves around the effects on Earth's orbit, specifically considering a hypothetical scenario where the sun is replaced by a rock of the same mass. Participants are exploring the implications of this scenario on orbital dynamics.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to reason whether Earth's orbit would remain unchanged due to the conservation of orbital energy, while also questioning the roles of kinetic and gravitational energy. Other participants discuss the forces that maintain Earth's orbit, with some asserting that a force, rather than energy, is responsible.

Discussion Status

The discussion is active, with participants exploring different interpretations of the forces and energies involved in orbital mechanics. There is a divergence in understanding, particularly regarding the distinction between energy and force in the context of orbits.

Contextual Notes

Participants are grappling with foundational concepts in orbital mechanics, including the definitions of energy and force, and how these relate to the stability of orbits. The hypothetical nature of the scenario introduces additional layers of complexity to the discussion.

aerogurl2
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I am having trouble understanding the concept of the effects on an orbit. The question asks if we replaced the sun with a rock of the same mass, would Earth's orbit change? I think it doesn't because orbits don't change because of its orbital energy. but I'm not sure because i wonder if the kinetic and gravitational energy would change and thus affect the orbit?
 
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What effect keeps the Earth in orbit?
 
i thought orbital energy keeps it in orbit
 
Wrong. A force keeps it in orbit. Not an energy. Which force?
 

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