HOAE General Science Practice Test

Bernoulli's principle describes what happens to fluid pressure as speed increases?

Increases Stays the same Becomes zero Decreases

Correct Answer:

Decreases

Explanation:

The main idea is that in a smooth, steady fluid flow, faster speed means lower pressure. This comes from Bernoulli’s principle, which says the total energy per unit volume along a streamline stays nearly constant: pressure energy plus kinetic energy (related to velocity) add up with any height energy. When a region of the flow speeds up, its kinetic energy term ½ρv² increases, so the static pressure must drop to keep the total energy balanced. That’s why pressure decreases as speed increases. This explains everyday examples like air moving faster over the top surface of a wing, where the rapid flow lowers pressure and helps produce lift. So the correct idea is that pressure decreases with increasing speed.

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