Gravity is an obvious example of a conservative force.
Notice that this does not violate energy conservation, since the lifting force must get its energy from somewhere, either your muscles, or some engine. 2. if on the other side, some net work is done on the body, the body will also increase its kinetic energy. We have seen that there are similarities between electricity and gravity. Well, if we have a charge in an electric field and let it free, the charge will move under the influence of the force-field. As long as our changes in altitude are small with respect to the earth radius, then we can assume that gravity is constant and apply the approximate expression mgh .