The potential energy of a system increases if work is done (a) by the sy...
Q. The
potential energy of a system increases if work is done
(a) by the system against a conservative force (b) by the system
against a non-conservative force (c) upon the system by a conservative
force (d) upon the system by a non-conservative forceAIPMT/NEET 2011 |
W.P.E Q 1 | A theoretical qus so please be aware there are more chances
of getting negative marks if concepts are not clear. Other thing is casual
attitude while attempting theoretical qus. Please make a habit of
reading all options carefully.
When
we move an object upto some height against gravity and release, it gains
kinetic energy while moving down. It means work done against a conservative
force like gravity is somehow stored, in the sense that we can get it back
again in the form of kinetic energy. We can consider the “stored work” as
If a
conservative force does positive work (as does gravity on a falling object),
then potential energy must decrease – and that means DU must be
negative. Conversely, if a conservative force does negative work (as does
gravity on a weight being lifted), then energy is stored and DU must be
positive.
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