Bernoulli's principle states that fluids flow from high pressure to low pressure. When drinking from a straw, the higher air pressure pushing down on the surface of the drink forces the fluid up the straw where the pressure is lower. The principle also explains that as the speed of a fluid increases, the pressure exerted by that fluid decreases, so faster moving air above an object exerts less pressure and allows the object to be pushed up, while faster air below exerts greater pressure and pushes the object down.

1. Bernoulli’s PrincipleChapter 11 Section 4

2. Fluid MotionFluids flow from high pressure to low pressureHow does this relate to drinking out of a straw?Higher air pressure pushing down on the surface of the drink forces fluid up straw where there is less pressure.

3. Bernoulli’s PrincipleThe faster a fluid moves, the less pressure it exerts.As fluid speed increases, the pressure decreases.Remember, air is fluid!

4. Turn to pg. 437 and try Standards Warm-upDraw a picture of what you did and draw arrows to show the side where the force is greater.

6. Objects in FlightIF the air moves faster above the object, fluid pressure pushes the object upward.IF the air move faster below the object, fluid pressure pushes it downward.

9. Air moves faster when you squeeze the bulb….lowering the air pressure.Higher air pressure in the bottle…