Final answer:
When wind hits a barrier like a hill or mountain, it experiences changes in velocity and pressure due to the Bernoulli principle, resulting in the wind flowing around the barrier instead of directly over it.
Step-by-step explanation:
When the wind hits a barrier such as a hill or a mountain, it experiences certain effects. One of these effects is known as the Bernoulli principle, which explains how the velocity of the wind changes when it encounters an obstacle. According to Bernoulli's principle, as the wind flows around the obstacle, its velocity increases on the side where the air pressure is lower, and decreases on the side where the air pressure is higher. This difference in velocity creates a pressure difference, causing the wind to be deflected or flow around the barrier.
For example, when wind encounters a hill, it is forced to move up and over the hill. As it does so, the wind speeds up on the side facing away from the hill, resulting in a lower pressure. On the side facing the hill, the wind slows down, creating a higher pressure. This pressure difference causes the wind to flow around the hill, rather than directly over it.
Learn more about Bernoulli principle