Hi everyone! I'm here for a little conveyance towards a question that is disturbing me for days. Just suppose, you and I design a hydroelectric generator that provokes energy from the downflow of precipitating rain. These falling drops of rain surely have originated from the vapours of the ocean and no doubt it is the Sun who has provided the Potential energy to the vapours to go up. These vapours then formed clouds which thereafter changed into rain droplets. These rain droplets then made their way down and of course, it is the invisible Gravity which brought them down by providing them Kinetic energy. So, the condition arises is if the accomplished energy of our generator is the outcome of the Kinetic energy provided by Gravity, where has the energy of the Sun gone; and in contrast, if the potential energy of the Sun rays transformed into kinetic energy then why is Gravity required? My teacher answered, "Gravity is just a force, not a donor of Kinetic energy." Then the question that can be further asked is — "A heavy ball placed on a thin plastic sheet conclusively breaks the sheet after some while. For that to happen there must have been a constant supplier of Kinetic Energy for all the plastic bonds to break. If Gravity is not the perfect provider then what it is?"