Gravity usually refers to gravity, and there are many ways to utilize gravitational potential energy.
1. Water wheel. The gravitational potential energy is converted into the rotation of the water wheel, and then drives the machine to work. Such as lifting water to higher places, grinding rice, sightseeing, etc.
2. Hydropower. Such as the Three Gorges, Gezhouba, etc. This form of utilizing water power is the most common.
3. Tidal power generation. Utilizes the gravitational pull of the moon and sun.