A(n) __________ is any substance that can flow and take the __________ of the container that holds it
fluid;shape
Any __________, such as water, is a fluid; although a liquid changes shape when it flows, its __________ stays the same.
liquid;volume
Any __________, such as air, is a fluid.
gas
When gas flows, its __________ becomes the shape of its container.
volume
Gases have different __________ in different containers.
volumes
When gas flows, it fills the __________ of its new container.
shape
__________ is the amount of force per unit of area applied to an object's surface.
Pressure
All __________ apply pressure.
fluids
Pressure applied on an object by a fluid is related to the __________ of the fluid.
weight
Pressure can be calculated by dividing the __________ applied to a surface by the __________ over which the force is applied.
force;area
The unit used when pressure is measured is the __________(Pa).
pascal
Pressure is applied by a fluid to all __________ of n object in contact with the fluid.
surfaces
Pressure decreases when the surface area over which it is applied __________.
increases
Pressure increases when the surface area over which it is applies __________.
decreases
Pressure applied by a fluid __________ with depth.
increases
__________ pressure is the ratio of the weight of all the air above you to your surface area.
Atmospheric
Atmospheric pressure __________ as elevation increases becauses the __________ of the air above you is less.
decreases; pressure
The pressure on an underwater object depends somewhat on the weight of the __________ above the object, but mostly the weight of the __________ above the object.
column of air; column of water
For the same volume of two different fluids, the weight of the __________ fluid results in more pressure.
denser
Density is __________ divided by __________.
mass; volume
A common unit of density is __________.
g/cm3(cubed)
The density of a material is determined by the __________ of the atoms or molecules in the material and the __________ between them.
masses; distances
Solids are usually __________ than the liquids or gases.
denser
A(n) __________ is an upward force applied by a fluid on an object in the fluid.
buoyant force
The upward buoyant force on an object is balanced by the force of a __________.
a fluid gravity
When the buoyant force on an object in a fluid is equal to the total __________ of the object, the object will __________.
weight; float
A buoyant force acts on any object in a(n) __________, such as water, and in a(n) __________, such as air.
liquid; gas
Forces from water pressure on an object within a fluid are in __________ and __________ directions.
horizontal ;vertical
__________ forces on the object are equal on all sides of the object, but the __________ forces are not equal.
horizontal; vertical
The difference between the upward and downward forces from pressure on an object in a fluid is the __________.
buoyant force
The buoyant force on an object is always a(n) __________ direction.
upward
The buoyant force on an object in a fluid stays the same when the object goes __________ in the fluid.
deeper
__________ states that the weight of the fluid that an object displaces is equal to the buoyant force on the object.
Archimedes' principle
As more water is displaced by an object that is pushed under water, the buoyant force acting on the object __________.
increases
When an object weighs more than the weight of the water it displaces, the object __________.
sinks
When the weight of an object is equal to the weight of the water it displaces, the object __________.
floats
If an object has greater density than the fluid in which it is places, the object __________.
sinks
A metal boat __________ because the overall density of the metal and the __________ in the boat is less than the density of water.
floats; air
If a metal boat fills with water, then the density of the metal and the water within the boat becomes greater than the density of water outside of the boat, and the boat __________.
sinks
A helium balloon __________ in air because the density of the helium within the balloon is __________ then the density of air outside of the balloon,
floats; less
As the volume of helium in the balloon __________, the balloon's density __________ and the balloon falls to the ground.
decreases; increases
When you squeeze a ketchup bottle, you use a(n) __________ force.
fluid
When strong winds damage property during a storm, fluid forces can be __________.
dangerous
__________ states that when pressure is applied to a fluid in a(n) __________ container, the pressure increases by the same amount everywhere in the container.
Pascal's principle; closed
A piston uses a(n) __________ force in one area to apply a(n) __________ force in another area.
smaller; larger
The input work by the piston is __________ to the output work done by the piston.
equal to
If the force is larger on one part of a piston, then that part moves __________ than the part where the force is less.
less
A(n) __________ lift also uses Pascal's principle.
hydraulic
In a hydraulic lift, a(n) __________ tube connects to a(n) __________ tube that fits under a car.
narrow; winder
Applying a(n) __________ force to the __________ tube generates enough force to lift a car.
smaller; narrow
__________ states that the pressure of a fluid decreases when the speed of the fluid increases.
Bernoulli's principle
For example, when a hose is pinched, the speed of water through the pinched area __________ and the pressure is __________ than it is in the unpinched portions of the hose.
speeds up; less
When the wind is strong, the air pressure is __________ than it is still in air.
lower
When strong winds blow over a house, the air outside the house has a(n) __________ speed, and the air inside the house has __________ speed.
high; no or low
When this happens, the force of the air pressure pushing __________ on the roof is less than the force of the air pressure pushing __________.
down; up
When the upward force inside becomes __________ than the combined downward forces, including the force of __________, the roof can rise.
greater; gravity
When a soccer ball is kicked so it spins, the __________ of one side of the ball is greater than it is on the other side.
pressure
The side of the soccer ball that has __________ air pressure acting on it.
greater
Because of the pressure difference, the ball __________ toward the side that has __________ pressure.
curves; lower
__________ is a force that opposes the motion of an object through a(n) __________.
Drag force; fluid
As the speed of an object through a fluid __________, the drag force on the object increases
increases
Drag force also depends on the __________ and the shape of the object.
size
If two object move in the same direction, the object that has greater __________ toward the direction of motion has __________ drag force on it.
surface area; greater
A larger parachute will have __________ drag force on it than a smaller parachute has.
greater
The drag force when you move through air is __________ then it is when you move through water because the __________ of water is greater.
lower; density asdfghjkl