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# Bernoulli's Principle Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. ## How Airplanes Fly Bernoulli's principle can be used to explain why airplanes fly. Airplanes wings are d...

# Bernoulli's Principle Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. ## How Airplanes Fly Bernoulli's principle can be used to explain why airplanes fly. Airplanes wings are designed to make air move faster over the top of a wing than under it. Air moving faster over the top exerts less pressure. Air moving slower exerts more pressure. The wing is then pushed up toward the lower pressure. ## Lift **Lift** - an upward force Bernoulli's principle describes the relationship between **speed** and **pressure**. * The faster a fluid moves, the less pressure it exerts. ### Airplane Wing * Air above wing = faster moving air = less pressure * Air below wing = slower moving air = more pressure # Pascal's Principle Pascal's principle states that pressure applied to a fluid in a closed container is transmitted equally to every point of the fluid and to the walls of the container. Pascal's principle is what makes hydraulic lifts work. Hydraulic lifts multiply force. $Pressure = \frac{Force}{Area}$ or $P = \frac{F}{A}$ * Since pressure is the same: $P_1 = P_2$ * Then $\frac{F_1}{A_1} = \frac{F_2}{A_2}$ Small force over small area can create large force over large area.