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    If an object (say a spacecraft) is falling to Earth on a return journey, it's potential becomes more negative.
    Does a reduction in Gravitational potential (becoming more negative) mean that work is being done ON the spacecraft by the gravitational field of Earth ?
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    Don't pay too much attention to the '-' sign on potential, it's just there to make it easier, so you can call 0V at infinity, rather than a different number for different objects.

    But yes if it's falling to earth, it's GPE is being converted to kinetic, so work is being done by the gravitational field
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    (Original post by JohnnyDavidson)
    Don't pay too much attention to the '-' sign on potential, it's just there to make it easier, so you can call 0V at infinity, rather than a different number for different objects.

    But yes if it's falling to earth, it's GPE is being converted to kinetic, so work is being done by the gravitational field
    Great thank you !
 
 
 
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