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35 Cards in this Set
- Front
- Back
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what is a fluid?
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any material that can flow and take the shape of its container.
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what is pressure?
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amount of force exerted on a given area
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what is the SI unit for pressure?
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pascal (Pa)
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pressure= ?/?
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pressure= force/area
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what is atmosphere?
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layer of nitrogen, oxygen, and other gases that surrounds the Earth.
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what is atmospheric pressure?
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pressure caused by the weight of the atmosphere
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what is density?
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amount of matter in a certain volume
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pressure _________ as you descend through the atmosphere.
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increases
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pressuer depends on the _________ of the fluid
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depth
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water exerts _________ pressure than air.
(greater or lesser) |
greater
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what is pascal's principle?
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a change in pressure at any point in an enclosed fluid will be transmitted equally to all parts of the fluid
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what is a hydraulic device?
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a device that uses liquids to transmit pressure from on point to another
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what are three things that allow objects to fly?
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angle of attack, air pressure, diff in air pressure
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what is buoyant force?
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the upward force that fluids exert on all matter
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what is the principle that states the faster a fluid moves, the lower the pressure?
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bernoulli's principle
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what controls roll?
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aileron
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the side to side motion is known as...
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yaw
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what are the two factors for lift?
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wingshape and thrust
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what does displace mean?
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to take place of
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buoyant force(upward force) opposes _________(downward force)
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gravity
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if an object is more dense than water, it will _______.
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sink
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what is a swim bladder?
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keeps a fish, submarine, boat, etc., from sinking
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the fish's nervous system controls amount of gas in the blader according to a fish's __________
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depth
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what is lift?
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upward force
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what is thrust?
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forward force produced by a plane's engine
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what is drag?
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force that opposes or restricts motion in a fluid
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what is turbulence?
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an irregular or unpredictable flow o fluids
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how do moving particles of matter create pressure?
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they collide with one another an with the walls of their container
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fluid pressure increases as _______ increases
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depth
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if an object that has less density than the surrounding fluid will ________
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float
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the hydraulic brakes of a car transmit pressure through fluid. this is an example of ___________?
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pascal's principle
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the curve on top of a wing...
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causes air to travel farther in the same amount of time as the air below the wing, helps create lift, an creates a low-pressure zone above the wing
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which principle determines if an object will float or sink in water?
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archimedes' principle
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what principle determines how birds fly?
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bernoulli's principle
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What will happen if the buoyant force on an object is greater than the weight of the object?
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The object will be pushed out of the fluid (buoyed up).
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