Which statement about the work done by forces along a closed path is correct?
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Which statement about the work done by forces along a closed path is correct?
(a) Both conservative and non-conservative forces do zero net work over any closed path because the starting and ending positions coincide.
(b) A conservative force does zero net work, whereas a non-conservative force generally does non-zero net work over a closed path.
(c) For a conservative force the work done over any closed path is the same fixed non-zero value, while for a non-conservative force it varies from path to path.
(d) The net work done by any force along a closed path is directly proportional to the length of the path; therefore it cannot be zero unless the path length is zero.