Physics 105, Fall Term, 2009
Reading: Chapter 9.7
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1) A fluid includes both liquids and gases.
2) Fluids flow according to Bernoulli's Principle.
Although all fluids have viscosity, or internal friction which in part determines the flow of a fluid, most fluids can be accurately described using Bernoulli's Principle. Bernoulli's principle is really just a the law of conservation of energy in a different form. Rather than using total energy, Bernoulli's Principle is based on energy densities, or the amount of energy in a specific area.
Go to: http://home.earthlink.net/~mmc1919/venturi.html and scroll about half way down the website until you see the pipe applet. On the applet you can change the width of the pipe at four different spots. Additionally, you can see the graphs of the pressure, flow rate, area, and velocity for each part of the pipe directly below the applet. Make several different pipe shapes while noticing how each shape affects the graphs.
What happens to the flow rate when the width of the pipe is increased?
Increases flow rate Decreases flow rate Does not change flow rate
What happens to the pressure when the width of the pipe is increased?
Increases pressure Decreases pressure Does not change pressure
What happens to the velocity of the fluid when the width of the pipe is increased?
Increases velocity Decreases velocity Does not change velocity
Explain why velocity of a fluid is influenced by the cross-sectional area of the pipe as answered in the question above.
An aneurysm is a condition where a portion of an artery balloons out causing a larger cross-sectional area and thinner arterial wall. What affects will this have on the blood flow in the artery? (select all that apply)
Increases flow rate Decreases flow rate Increases pressure Decreases pressure Increases velocity Decreases velocity
Why is an aneurysm dangerous?
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Was there anything that you didn't understand in the reading assignment? What was confusing to you?
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