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Forces in Fluids

Vocabulary for Force & Fluids

QuestionAnswer
fluid a non-solid state of matter in which the atoms or molecules are free to move past each other, as in a gas or liquid
pressure the amount of force exerted per unit area of a surface
pascal the SI unit of pressure (symbol, Pa)
atmospheric pressure the pressure caused by the weight of the atmosphere
buoyant force the upward force that keeps an object immersed in or floating on a liquid
Archimedes’ Principle the principle that states that the buoyant force of an object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces
Bernoulli’s Principle the principle that states that the pressure in a fluid decreases as the fluid’s velocity increases
thrust the pushing or pulling force exerted by the engine of an aircraft or rocket
drag 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
Pascal’s Principle the principle that states that a fluid in equilibrium contained in a vessel exerts a pressure of equal intensity in all directions
inertia he tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object
momentum a quantity defined as the product of the mass and velocity of an object
Solids particles are packed closely together and are not free to move. Solids have a definite shape and volume
Liquids particles are loosley packed together they bump and slide past one another. Liquids have no shape but a definite volume
Gases particles a very spread out and constantly moving. Gases have no fixed shape or volume.
Matter Anything that takes up space is called matter. The Physical part of the universe.
Phase change a change from one state (solid or liquid or gas) to another without a change in chemical composition
Created by: kgreen4
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