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Gravity
Terms in this set (53)
formula for pressure?
P=Force/Area
Whats the SI unit?
N/m2
SI unit of force...
N
SI unit of are...
m2 (m squared)
_______ decreses as the are over which a force is distributed ________
pressure, increases
all of the forces exerted by the individual particles in a fluid combine to make up the ______ exerted by fluid.
pressure
As elevation increases, atmospheric pressure ________
decreases
Water pressure increases as depth _____________
increases
equal to the force exerted on a surface divided by the total area over which the force is exerted
pressure
this unit of pressure is called
pascal
a material that can easily flow
fluid
the ______ force acts in the direction opposite to the force of gravity, so it makes an object feel lighter
buoyant
By comparing ______ you can predict whether an object will flow or sink
densities
What is the formula of density?
density = mass/volume
Water and other fluids exert an upward force
Buoyant Force
states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces
Archimedes' Principal
mass per unit volume
density
When ____ is applied to a confined fluid the change in pressure is transmitted ______ to all parts of the fluid
force, equally
When force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid.
Pascal's Principle
upward force
lift
Bernoulli's principle also explains how things _____
lift
that as the speed of a moving fluid increases , the pressure within the fluid decreases
Bernoulli's Principle
If you know the weight of a object that floats you know the object's ____
density?
valve provides water at nearly constant temperature to a shower or bathtub
balanced pressure
you can measure atmospheric pressure with an instrument called
Barometer
an object that floats in the water
positively buoyant
something that sinks to the bottom
negitiveily buoyant
a condition in which a physical body's average density is equal to the density of the fluid in which it is immersed.
neutral buoyant
states that the buoyant force acting on a submerged object is equal to the weight of the fluid of the object displaces.
Archimedes' principal
usées liquids to transmit pressure in a confined fluid
Hydraulic systems
formula for force
force=mass*acceleration
formula for acceleration
acceleration=(Fs-Is)/time
formula for momentum
P=mass*velocity
Formula for speed
speed=distance/time
What do you measure speed in?
m/s
Who was Archimedes?
-He was a
mathematician.
-He got into a bathtub and realized that when he got in the tub the water rises, he felt so accomplished that he ran down the street naked!
Who was Pascal?
-invented a calculator
-French mathematician and physicist
something that slows it down
drag
thrust
is the forward force required to move an aircraft through the air, overcoming drag
What happens to atmospheric pressure as you increase in elevation?
As you go further and further away from the surface, or higher in altitude, gravity becomes weaker and doesn't attract many molecules. In an area further away from Earth's surface, there are less air molecules for gravity to pull on. Therefore, the atmospheric pressure decreases as altitude increases.
What happens to water pressure as you increase in depth?
it also increases
How have we used Pascal's principle to our advantage in life?
brakes on a car
As one swims lower and lower in the ocean, what happens to the pressure around them?
increases
If the air pressure is so great outside our bodies, why don't we get crushed?
there is another air pressure pushing too
What allows a submarine to float? What allows it to sink?
pressure
What is the unit of pressure called?
newton
What is buoyancy?
A force acts in the directions opposite to the force of gravity, so it makes an object feel lighter.
In terms of altitude, what happens to air pressure as you go up?
pressure decreases
What type of substance does Pascal's principle deal with?
fluids
If an object floats, the volume of water that is displaces is equal to what?
No. If it SINKS the volume of water displaced is equal to the volume of the object.
Why does smoke rise up a chimney? Whose principal?
Convection causes the smoke from the fire in a fireplace to rise up the chimney instead of entering your home.
What does a barometer measure?
measures atmospheric pressure
air resistance is also called what?
drag
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