List some everyday forces that are not conservative, and explain why they aren’t.

If the work done by the force only relies on the initial and final locations and is independent of the path taken, such force is called conservative force. A conservative force conserves the mechanical energy.

If the work done by a force depends on the path taken between an object's initial and final locations, such force is called the non-conservative force. The loss in mechanical energy takes place in non-conservative force.

The examples of the non-conservative forces are as follows:

(1) Frictional force: It is considered a non-conservative force because the work done by the frictional force depends on its path. A rolling ball comes down to rest because of the force of friction. The frictional force converts the rotational kinetic energy of the ball into heat and internal energy.

(2) Air resistance or air drag:It is considered a non-conservative force because it is path-dependent. If an object is moving or floating in the air, the kinetic energy of the object will cause the vibration of air molecules, and they will impart air drag to the object; this air drag converts the kinetic energy of the object into thermal energy.

(3) Tension in a cord: It is considered a non-conservative force because the work done by the tension force depends on the path.

(4)Push or pull force by a person:It is considered a non-conservative force because the work done by the push or pull by the person depends on the path followed.

(5) When a baseball strikes a bat and it again bounces back due to the existence of a normal force. But after the first collision, some of the kinetic energy is lost in the sound and heat energy. Therefore, normal force is a non-conservative force.