Question

Is work done by a non conservative force always negative

Answer 1

yes, work done by non-conservative forces is always negative because it always opposes the motion it means that it's direction is always -ve.and since work done = Fs and if F is -ve and displacement is s the work done will be in -ve direction.(-ve*+ve= -ve)
           i hope that this will help u...............

Answer 2

yes,work done by a non conservative force is always is negative.