Book 2 Chapter 3 Flashcards
a nonsolid state of matter in which the atoms are free to move past each other, as in a gas or a liquid
fluid
the amount of force exerted per unit area of a surface
pressure
the SI unit of pressure (symbol, Pa)
pascal
the pressure caused by the weigh of the atmosphere
atmospheric pressure
the upward force that keeps an object immersed or floating on a liquid
buoyant force
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
Archmedes’ principle
the principle that states that the pressure in a fluid decreases as the fluid’s velocity increases
Bernoulli’s principle
an upward force on an object that moves in a fluid
lift
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 an, in combination with thrust, determines the speed of the aircraft
drag
the principle that states that a fluid in equilibrium contained in a vessel exerts a pressure of equal intensity in all directions
Pascal’s Principle