Forces in fluids (liquids and gases)SI unit of pressure is the Pascal 1 Pascal = 1 Newton/ 1 square...
Transcript of Forces in fluids (liquids and gases)SI unit of pressure is the Pascal 1 Pascal = 1 Newton/ 1 square...
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Forces in fluids (liquids and gases)
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Pressure
Force is related to pressure; BUT force is not equal to pressure.
Pressure = force/ area
Remember force is measured in Newtons (N)
Remember area is in square units (m2)
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SI unit of pressure is the Pascal
1 Pascal = 1 Newton/ 1 square meter
1 Pa= N/ m2
All of the forces exerted by the individual molecules in a fluid add together to make up the pressure exerted by the fluid.
Fluid= a liquid or a gas
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The more “stuff” over you the greater the pressure.
Water pressure increases as depth increases.
Air pressure decreases as elevation increases.
Remember weight is a force.
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Air pressure (at sea level)
14.7 pounds per square in; 14.7 Lbs./ in2
10.13 N/ cm2
10.13 N/ cm2 = Pa
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Buoyancy
The buoyant force acts in the upward direction, against gravity, so it makes the object feel lighter.
Since pressure is greater with depth, the buoyant force is greatest below the object. The net force is upward.
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Weight vs. buoyant force
Archimedes’ principle:
The buoyant force on an object is equal to the weight of the fluid displaced by the object.
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Buoyancy and Density
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Density
Density = mass/ volume
Mass is measured in grams.
Volume is measured in ml or cm3
Density = grams/ ml or grams/ cm3
http://ippex.pppl.gov/interactive/matter/denslab.html
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Pascal’s principle
When force is applied to a confined fluid (closed system), an increase in pressure is transmitted equally to all parts of the fluid.
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Pressure at A= 500 N/ 1m2
Pressure at car= /20m2
500N/ 1m2 = ?/20m2
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A little force/ small area =
A large force/ large area
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Bernoulli’s principle
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http://www.innerbody.com/htm/body.html
http://www.ims.uni-stuttgart.de/phonetik/EGG/page5a.htm
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Density
Density = mass/ volume
Mass is measured in grams.
Volume is measured in ml or cm3
Density = grams/ ml or grams/ cm3
http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=17
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