Gravitational potential energy

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Homework Help Overview

The discussion revolves around gravitational potential energy and the work done when changing the distance between two particles with known masses and gravitational attraction. The original poster is seeking clarification on the appropriate equation to use for calculating work in this context.

Discussion Character

  • Exploratory, Conceptual clarification

Approaches and Questions Raised

  • The original poster expresses uncertainty about which equation to use for calculating work done when the distance between two particles is tripled. Another participant asks for a definition of gravitational potential energy, hinting at its relationship with work.

Discussion Status

The discussion includes attempts to clarify concepts related to gravitational potential energy and work. One participant indicates they have resolved their question after receiving a hint, suggesting some productive direction has been achieved.

Contextual Notes

There is a mention of the original poster's textbook not providing sufficient explanation regarding the equation needed for the problem, which may indicate a gap in resources or understanding of the topic.

bearhug
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A 5.2 kg particle and a 2.4 kg particle have a gravitational attraction of magnitude 2.3E-12 N.
Gravitational potential energy is -4.40e-11J and r=19.03m

If you were to triple the distance between these particles, how much work is done by you on the particles?

My biggest problem here is that I don't know what equation I should use to find the work done. My book doesn't explain it very well. The first part of the question I figured out fine but this is where I'm stuck. Any help would be greatly appreciated.
 
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What is the definition (not the equation) of gravitaional potential energy? Hint: it has something to do with work.
 
The work done on the system is a change in gravitational potential energy.
 
Nevermind, what I just posted is what I needed to know, I figured it out. Thanks for your hint.
 

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