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?

Calculate the kinetic energy of earth due to its spinning about its axis. krot = j compare your answer with the kinetic energy of the orbital motion of earth's center of mass about the sun. assume earth to be a homogeneous sphere of mass 6.00 1024 kg and radius 6.40 106 m. the radius of earth's orbit is 1.50 1011 m.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system