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Chapter 18
26 cards·by Justin Davis
What is Pressure?
The force exerted over an area on the surface of an object
Pressure decreases as the?
area over force increases
Pressure equals
force over area
N/m^2 is the unit of pressure called
pascal
A material that can easily flow
fluid
All of the forces exerted by the individual particles in a fluid combine to
make up the pressure exerted by the fluid
what produces air pressure
The weight of the air
atmospheric pressure does what above sea level
Decreases
atmospheric pressure does what below sea level
Increases
Water and other fluids exert an upward force called the? It only works on submerged objects
buoyant force
The buoyant force acts opposite to the ?
Force of gravity
What principle states that the buoyant force acting on a submerged object is equal to the
weight of the fluid the object has displaced
Archimedes' principle
What does density equal?
mass over volume
What of an object can help u determine if it will float or sink
its density
an object that is more dense then the fluid will
sink
an object that is less dense then the fluid will
rise to the surface
Why does a balloon of helium rise.
helium is less dense then air
When force is applied to a confined fluid, the change in pressure is transmitted-
equally to all parts
When force is applied to a confined fluid, the change in pressure is transmitted equally to all
parts is called?
Pascal principle
Uses liquids to transmit pressure in a confined fluid
Hydraulic System
A hydraulic system multiplies force by applying the force to a ?
small surface area
How does a hydraulic system work?
it applys a force to an enclosed fluid
a fluid flows from an area of-
high to low pressure
states that the faster a fluid moves, the less pressure the fluid exerts.
Bernoulli's principle
air moves faster______ the wing
above
An upward force.
lift