what does vertical pressure gradient force do
1 The vertical pressure gradient force results from molecules in the high pressure near the earth's surface trying to move upward where the pressure is lower. 2  Horizontal pressure gradient force-results from the high and low pressure systems (highs, lows, troughs and ridges) in the atmosphere. Air will tend to move from high pressure to low pressure. 2  Coriolis force-the force that results from Earth's rotation. 3  Friction-the drag exerted on the air by the earth's surface (e.g., plants, trees, buildings, mountains, etc.). 4  Centrifugal force-the tendency for a body to resist a change in direction.