Work done by conservative force is equal to

Question

Question

This question was previously asked in

UPPSC AE Mechanical 2022 Official Paper I (Held on 29 May 2022)

Answer 1

Explanation:

Non-conservative forces:

A non-conservative force is one for which work depends on the path taken.
Friction is an example of a non-conservative force that changes mechanical energy into thermal energy.
Work Wnc done by a non-conservative force changes the mechanical energy of a system.
In equation form, Wnc = ΔKE + ΔPE or, equivalently, KEi + PEi = Wnc + KEf + PEf.

Conservative forces:

A conservative force is one, for which work done by or against it depends only on the starting and ending points of a motion and not on the path taken.
Example potential energy, gravitational force etc.
Work done by conservative force is equal to decrease in potential energy.