Do you know that the higher something is, the greater airjordan1 its gravitational potential energy. When we go back to the Middle Ages, weapons called Trebuchets j-m-darom were used to take an advantage of this principle, using mechanical advantage and the gravitational potential energy of a counterweight baityeled to hurl rocks and other projectiles through or over klekner walls. In modern times we use the gravitational rflaw potential of water to create hydroelectricity - electricity produced from hydropower.