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Terms in this set (47)
any material that can flow or take s the shape of its container
liquids (gases are also liquids)
what can particles in a fluid do?
move past each other easily
what happens when you pump up a bike tire?
the particles of air bump together and move past each other
the amount of force exerted per unit area of a surface
force divided by area equals
the si unit of pressure
the force of one newton exerted over an area of one square meter
why are gas bubbles round?
fluids exert pressure evenly in all directions, so it creates the circular shape of the bubble
pressure caused by the weight of the atmosphere
percentage of gases found within 10 km of earth's surface
force that holds the atmosphere in place
number of newtons pressing on every square centimeter of your body
as you travel deeper into the atmosphere, how is the atmospheric pressure affected?
why do your ears pop when you take off in an airplane?
the pressure inside your ears is greater
water pressure increases as
water and atmospheric pressure affect total pressure on objects that are
water pressure does not depend on
the amount of fluid present
water is about 1000 times more dense than
the amount of matter in a given volume, or mass per unit volume, is called
why does water exert more pressure than air
water is denser than air
the pressure at 500 m below the surface is about
the pressure at 8000 m below the surface is about
describe the pressure changes as you sip a drink through a straw
you remove air, so the pressur eis reduced
what happens when pressure is lower inside the lungs than outside
air flows into your lungs from high to low pressure
how do pressure differences affect the direction in which fluids flow
from high to low
how do pressure differences explain the destructive affects of a tornadoes winds?
the air pressure is higher outside the tornado than inside, so winds rush in making it like a giant vacuum
the upward force that fluids exert on all matter is called
in a fluid, buoyant force exists because the pressure at the _____ of an object is greater than the pressure at the top.
The buoyant force on an object in a fluid is an upward force equal to the weight of the fluid that the object takes the place of, or displaces
the weight of the displaced fluid determines the
buoyant force acting on the object
if the weight of the water the object displaces is equal to the weight of the object, the object...?
if the weight of the water an object displace is less than the weight of the object, the object...?
if the weight of the water an object displaces is greater than the weight of the object, the object...?
is buoyed up
when a rock sinks?
buoyant force is less than weight
when a duck is buoyed up?
buoyant force is greater than weight
when a fish is suspended in water?
buoyant force equals weight
how does the density of a rock affect its ability to float?
the rock is denser than water, it has more mass, so it sinks
why does an ice cube float in water?
it is less dense than water
how does a helium balloon float in air?
helium is a gas that is less dense than air
the volume of a regular solid can be determined by
multiplying together the lengths of its sides
the volume of an irregular solid equals
the volume of water it displaces when fully submerged
a ship's hollow shape increases its ______ and decreases its overall _______, allowing it to float
if a steel ship were not hollow, it would _____
what is the purpose of a submarine's ballast tanks?
as the water flows in, the submarine's mass increases, but its volume stays the same. The subs overall density increases so that it can dive beneath the surface
how is compressed air used in a sub?
blows water out of the tanks so the sub can rise
how does a fish's swim bladder increase its overall density?
it increases the fish's volume, which decreases its overall density
how do fish w/o swim bladders keep from sinking?
they swim constantly
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