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Fluids

Fluids. BELLWORK – in NOTES What does it mean to be fluid?. TN Standards. CLE.3202.1.8 – Investigate relationships among the pressure, temperature, and volume of gases / liquids CLE.3202.Inq.3 – Use appropriate tools and technology to collect precise and accurate data

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Fluids

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  1. Fluids BELLWORK – in NOTES What does it mean to be fluid?

  2. TN Standards CLE.3202.1.8 – Investigate relationships among the pressure, temperature, and volume of gases / liquids CLE.3202.Inq.3 – Use appropriate tools and technology to collect precise and accurate data CLE.3202.Inq.6 – Communicate and defend scientific findings

  3. NOTES

  4. Fluids • Liquids and gases are considered fluids • Their particles move easily • across each other • Around each other • They flow ( like water flowing down a stream )

  5. Fluids • Fluids vary at the rate with which they flow • Fluids move faster through small areas than through larger areas, if the overall flow rate remains constant. • Bernoulli Effect • Fluid pressure decreases as speed Increases

  6. Viscosity • Viscosity is the resistance of a gas or liquid to flow • Thicker fluid is more viscous • Depends on particle attraction • Honey vs Lemonade?

  7. Common Examples of Fluids • 2 o’clock groups – PARTNERS • Take Notebooks • In Notes, list 10 common fluids you can think of • 5 should be a gas • 5 should be a liquid

  8. Common Examples of Fluids • Gas: oxygen, nitrogen, carbon dioxide, carbon monoxide, helium • Liquids: mercury, water, honey, lemonade, olive oil

  9. Properties of Gases • Expand to fill their containers • Spread out easily and mix with each other • Have low densities and are compressible • Mostly empty space ( unlike solids & liquids )

  10. PhET Simulation – Lab Groups • THIS WILL BE GRADED AS A LAB GRADE • Each student turns in their own paper

  11. PhET Simulation – Study Groups • Go to station & log into labtop • PhET website ( google “PhET” – 1st link ) • Search “Fluids” • Choose “Fluid Pressure and Flow” • Run simulation

  12. Label Paper • “Fluid Pressure and Flow Simulation”

  13. Pressure tab • Start with “Pressure” tab • Fill up the “hole” ( choose 1st image on upper left ) • Drag pressure gauges to the bottom, middle, and top • 1] Write down “Full container of water” and each those three pressure readings • Example: “Top – 101.4 kPa”

  14. Pressure tab 2] Do the pressure readings increase or decrease as you go from the water surface to the bottom of the hole? 3] Explain why. Relate to the equation for PRESSURE

  15. Flow tab • Go to the “Flow” tab 4] What is the initial Flow Rate ( upper left )? • Use yellow handles on pipe to make the middle section more narrow 5] What happens to the flow of particles in the narrow section? 6] Explain why ( look in today’s notes ). USE PRESSURE GAUGES ( 1 IN THE NARROW & 1 IN THE WIDE PART ) LAST THING – decrease flow rate to ~2000 L/s and observe

  16. Exit Pass –Water Tower • DO WITH LAB QUESTIONS • Go to “Water Tower” tab • 7] QUESTION: as the tower is filled up, how should the pressure change at the bottom of tank ( increase or decrease )? • Try it out and see – drag a pressure gauge to bottom of tank, then turn the water on at top

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