So we saw that a conservative force is path independent.
And we also had examples of forces
which are path dependent, if you have a path 2 and path 1.
And the work done is path dependent.
So that means for each path we will get a different answer.
Then we call this force F, be denoted by nc,
is called nonconservative.
And again, we see that friction is the best example
of a nonconservative force.
And if we go again for a nonconservative work,
if we integrate from the initial point
to the final point, for instance, on our path
1 of this nonconservative force, so if we integrate this way
and if we reverse the interval, and so we go back
from the final point to the initial point on path 2,
that these integrals will not be equal to the negative view
of each other because the quantities are
different for the different paths, in general,
and so this is nonzero.
And in fact, that's the property of nonconservative forces,
that the work done around a closed
path for a nonconservative force is not equal to zero,
in general.
There may be one specific closed path
in which that answer is zero.
But in general, it's nonzero.