When one ball is raised, it acquires potential energy which is then transformed into kinetic energy once the ball is released.

in theory, the total energy should be conserved such that the balls continue in perpetual motion. however, over time, the balls stop moving. why?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.