| A | B |
|---|
| the pushing or pulling force exerted by the engine of an aircraft or rocket | Thrust |
| a force parallel to the velocity of the flow; it opposes the direction of an aircraft and, in combination with thrust, determines the speed of the aircraft | drag |
| the principle that states that the pressure in a fluid decreases as the fluid velocity increases | Bernoulli's principle |
| an upward force on an obect that moves in a fluid | lift |
| the principle that states that the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces | Archimedes' principle |
| the upward force that keeps an object immersed in or floating on a liquid | buoyant force |
| a nonsolid state of matter in which the atoms or molecules are free to move past each other, as in a gas or liquid | fluid |
| the amount of force exerted per unit area of a surface | pressure |
| the SI unit of pressure | pascal |
| the pressure caused by the weight of the atmosphere | atmospheric pressure |
