Which of these is not a conservative force and does not have a form of potential energy connected with it?

Question

anonymous · Answer

the force exerted by a spring

       gravity

       friction

       the force between two electric charges

anonymous · Answer

This is easy.. imagine a scenario in which a particle is being exerted a force of each kind.. and see what happens.. 

gravity is the easiest.. . imagine throwing a ball upwards.. its k.E decreases.. and finally becomes zero.. but the particle recovers that energy while descending.. so .. K.e was converted to P.e.. hence gravity is a conservative

now imagine.. what would happen when a  particle is in motion attached to a spring, is in motion on a rough surface, and in motion inside an electric field