Pressure gradient: The pressure gradient is the rate at which the pressure decreases as you move away from a given point in a fluid. This gradient is caused by differences in air pressure, with areas of higher pressure having a greater gradient than areas of lower pressure.
Coriolis Force: The Coriolis force is a force that acts on objects moving in a rotating system. It is due to the Coriolis effect, which is caused by the rotation of the Earth. This force is responsible for the deflection of winds and currents to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
Friction: Friction is the force that resists the relative motion of two objects in contact. It is caused by the interaction of the surfaces of the two objects and can be either static or kinetic. Friction plays an important role in many everyday activities, from walking to driving a car.