The surface tension in water makes it stick to the surface of objects. A classic…
Detaling Basics – Kinetic Energy
Kinetic energy is where the water is moving. Generally, this is where the water is being blown by strong winds. I have used the roof example, which is common where I live. The wind often blows water up the roof slope, and under flashings. The flashings will stop a lot of the water, but without a stop end on the roofing, the water can enter the building.