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    Diksha Singh's Avatar
    Diksha Singh Posts: 6, Reputation: 1
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    #1

    Jun 19, 2015, 06:59 AM
    Potential energy
    Potential energy of a system increases when work is done
    Options:- a) on the system by a conservative force
    b) On the system by a non conservative force
    C) by the system against a conservative force
    Ans is c... explanation??
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jun 19, 2015, 10:47 AM
    Consider the example of a ball falling under gravity: work is being done on it by the force of gravity, correct? Does it gain or lose PE as it falls? Now consider a ball that has been thrown upward - does gravity do work on it, or does it do work on gravity? That's enough of a hint - please post back with a complete explanation.
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