17 The potential energy of a system increases if work is done
by the system against a conservative force (b) by the system agams.
(c) upon the system by a conservative force
(d) upon the system
(b) by the system against a non-conservative force
the particle is displaced fro
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(a) When the work is done by system against any conservative force the potential energy increases.
−ΔU =W conservative force
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What is a conservative force?
Gravitational force is a conservative force. For a conservative force work done by or against it depends only on the initial and final points.
On the other hand frictional force is non-conservative force, It depends on the path travelled.
When the work is done by the system against any conservative force the potential energy increases.
−ΔU = Wconservative force
so, (a) by the system against a conservative force, is correct answer.
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