Do you mean "who formulated the description of gravitational attraction/force?" In other words, this: Newton's law of universal gravitation. read more
Gravitational energy is often harnessed and used as a source of clean power for consumption. Hydro power is energy produced by the force of falling water, such as water in a reservoir behind a dam. When the dam is open and water is allowed to pass through to lower ground, the energy from the force created is accessible. read more