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Mechanics

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Joined:	2 Dec 2008
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2 Dec 2008 07:39:52 IST

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when work done by gravity is negative what happne to PE?

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when work done by gravity is negative what happne to PE?

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waterdemon

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Joined: 11 Jun 2007

Posts: 1048

2 Dec 2008 08:31:32 IST

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The work done by gravity will be negative when the motion of the object is in the direction opposite to "gravity"

Means the object moves up.
Therefore the height "H" increases.

Therefore,
PE will increase and will be positive.
hope it helps.

Rizwan M

Cool goIITian

Joined: 13 Nov 2008

Posts: 89

2 Dec 2008 10:56:23 IST

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Dude sumthing wrong with explanations

potential energy is always negetive when it comes to gravity

F = GMm/r2; P=-GMm/r;

so as distance increases PE icreases to a max value of zero

that depends wat kind of q is asked is it with respect to earth the explanation is

correct otherwise wen interplanetary qs then my explanation holds

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