Formula for Work Done by Nonconservative Forces?

W_nc = ΔKE + ΔPE. This equation means that the total mechanical energy (KE + PE) changes by exactly the amount of work done by nonconservative forces.

What is the work done by conservative force?

The total work done by a conservative force is independent of the path resulting in a given displacement and is equal to zero when the path is a closed loop. Stored energy, or potential energy, can be defined only for conservative forces.

Can non conservative forces do work?

Non-conservative forces can also do positive work thereby increasing the total mechanical energy of the system. The energy transferred to overcome friction depends on the distance covered and is converted to thermal energy which can't be recovered by the system.