Gravitational potential energy

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Discussion Overview

The discussion revolves around the concept of gravitational potential energy, particularly how it changes with height relative to the Earth's radius. Participants explore the behavior of potential energy as height approaches infinity and consider the implications for graphing this relationship.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how gravitational potential energy changes as height increases beyond the Earth's radius and asks for a graphical representation of this relationship.
  • Another participant suggests that the question may be related to homework and prompts the use of the equation for potential energy, noting that gravitational acceleration (g) varies with distance at large heights.
  • A different participant provides the formula for gravitational potential energy as -GM/r and explains that as the distance (r) from the Earth's center increases, the potential energy approaches zero, indicating a maximum value through negative values.
  • One participant introduces the law of conservation of energy, mentioning the concept of negative energy in this context.
  • Another participant humorously remarks on the notion of negative energy being a result of terminology, suggesting that calling a pull a negative push led to this concept.
  • A participant expresses agreement with a previous comment, indicating that the work-energy theorem can provide insight into the discussion.

Areas of Agreement / Disagreement

Participants express differing views on whether the initial question is homework-related. There is also a lack of consensus on the implications of negative energy and how it relates to gravitational potential energy.

Contextual Notes

Some assumptions about the definitions of gravitational potential energy and the behavior of gravitational acceleration at large distances are not explicitly stated, which may affect the clarity of the discussion.

Who May Find This Useful

Individuals interested in gravitational physics, energy conservation principles, and those exploring the mathematical relationships in physics may find this discussion relevant.

heinrich
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if we think the height of a matter reaches over the radius of the Earth how will the potential energy of it change?
when height of it approaches infinite from zero how will be the graph of gravitational potential energy-height?
thank you
 
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Is this homework? Do you know the equation for potential energy? Graph it!

edit: actually, since g changes with distance for large distances, you'll want to insert the equation for g into it.
 
Last edited:
Somehow I don't feel this was a HW question.

The PE of the Earth's grav field is -GM/r, where r is the dist from the centre. As r increases, GM/r decreases, and so -GM/r increases. As r tends to infinity, the PE tends to zero, which is the maximum value, through negative values, .

The graph between PE and r is a rectangular hyperbola.
 
the law of conservation of energy states that energy is never created or destroyed. it just changes from one form to another. good thing they invented negative energy to rescue this rule.
 
Actually, it sort of got invented by itself, when we called pull a negative push. :smile:
 
i agree with shooting star...you can easily see it from the work energy theorem...
 

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