Notes 11-1 Pressure. What Is Pressure? The amount of pressure you exert depends on the area over...
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Transcript of Notes 11-1 Pressure. What Is Pressure? The amount of pressure you exert depends on the area over...
![Page 1: Notes 11-1 Pressure. What Is Pressure? The amount of pressure you exert depends on the area over which you exert a force.](https://reader037.fdocuments.us/reader037/viewer/2022110103/56649f315503460f94c4bd01/html5/thumbnails/1.jpg)
Notes 11-1
Pressure
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What Is Pressure?
• The amount of pressure you exert depends on the area over which you exert a force.
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Calculating Pressure
Pressure = Force Area = Length x Width
Area
Units:
Force- Newton (N)Area-square meters (m2)Pressure- Pascal (Pa)
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Area • The area of a surface is the number of square units that it
covers. To find the area of a rectangle, multiply its length by its width. The area of the rectangle below is 2 cm X 3 cm, or 6 cm2.
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Area
• Practice Problem
• Which has a greater area: a rectangle that is 4 cm X 20 cm or a square that is 10 cm X 10 cm?
• The square has the greater area.• 4 cm X 20 cm = 80 cm2
• 10 cm X 10 cm = 100 cm2
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Fluids
• A material that can easily flow.
• Examples?• Liquids• Gases
• Tiny particles are constantly moving and colliding with surfaces, which exerts forces on the surfaces.
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Fluid Pressure• All of the forces exerted by the individual
particles in a fluid combine to make up the pressure exerted by the fluid.
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Air Pressure
• Right now, there is approximately 100 km of fluid on top of you…
• AIR!• The weight of the air exerts a force which
causes air pressure or atmospheric pressure.• Why are you not crushed by these fluids?• The forces are exerted from all directions so
they are balanced.
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Variations in Fluid Pressure• As your elevation
increases, atmospheric pressure decreases.
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Variations in Fluid Pressure
• Water pressure increases as depth increases.
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Measuring Pressure• You can measure atmospheric pressure with a
barometer• Meteorologists use barometers to measure
pressure to help forecast the weather• Decrease in pressure = storm