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PRESSURE=FORCE
AREA
measured in Pascals=1N/m2
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states that as the speed of a moving fluid increases the pressure within the fluid decreases
Ex: planes lift because of the pressure difference above and below the wing
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states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces
Ex: a big ship will float once it displaces a volume of water |
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states when force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid
EX: Hydraulic System |
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CAN A FLUID EASILY CHANGE SHAPE ? |
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yes, a fluid is a material that can easily flow; therefore, a fluid can change shape. ex: water, oil, air, helium |
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| WHAT HAPPENS TO WATER PRESSURE AS DEPTH INCREASES ? |
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as depth increases,water pressure increases
ex: ears feel pessure the deeper you dive in the water |
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WHAT HAPPENS TO ATMOSPHERIC PRESSURE AS ELEVATION INCREASES ? |
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as elevation increases, atmospeheric pressure decreases. ex: ears pop in an airplane |
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| WHY DO FLUIDS EXERT PRESSURE ? |
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| because they are made up of tiny moving molecules that exert force. |
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| AN OBJECT THAT IS MORE DENSE THAN WATER WILL ? |
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| AN OBJECT THAT IS LESS DENSE THAN WATER WILL ? |
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| The SI UNIT of PRESSURE is ? |
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| WHY DOES AN OBJECT UNDER WATER FEEL LIGHTER THAN IT DOES IN AIR ? |
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it is being pushed upward by buoyant force Ex: Holding a person in the water versus holding that person on land |
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| substance that can easily flow and changes shape easily |
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| instrument used to measure atmospheric pressure |
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| system that multiplies force by transmitting pressure from a small surface area through a confined fluid to a larger surface area |
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a unit of pressure equal to 1 newton per square meter
or
1N/m2 |
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| What is buoyant force and why does it make things feel lighter in the water? |
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| BF is a force that acts in the opposite direction to the force of gravity, so it makes an object feel lighter. |
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| pressure is equal to the force exerted on a surface divided by the total area over which the force is exerted |
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What is atmospheric (air) pressure and what is it measured with?
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Atmospheric or Air pressure is the pressure of the gases in the atmosphere exerts on the earths surface.
It is measured with a barometer |
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| What happens to air pressure at high elevations? |
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| Air pressure is less becasue there is less air above |
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| The density of an onjecy would be changed by changing the onjects volume or its? |
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