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Fluids Lecture: Density, Pressure & Archimedes Principle

Learn about fluid statics, Pascal's principle, and Archimedes principle. Discover how density, pressure, and buoyancy affect objects in fluids. Practice problems and prepare for the exam. Due on Thursday May 8th.

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Fluids Lecture: Density, Pressure & Archimedes Principle

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  1. Lecture 14.1 Fluids

  2. Does lead float?

  3. Schedule today • Fluid Statics • Density • Pascal's Principle • Archimedes Principle • Exam • Solutions • Curve

  4. HW #13 (Chapter 14) • Read Sections 14-1 to 14.5 • Problems: 14.4, 14.26, 14.35, 14.39, 14.59 • Due: Thursday May 8

  5. Density does not depend on the size of the object • Density is a measure of how much mass occupies a given volume.

  6. Densities of common substances

  7. The pressure in a fluid • Pressure in a fluid is force per unit area. The Pascal is the given SI unit for pressure. • 1 Pascal (Pa) = 1 N/m2 • 1 atmosphere = 1.01 x 105 Pa • about 15 PSI

  8. Pressure, depth, and Pascal’s Law

  9. Pressure • Pressure increases as you go down in a fluid (uniform density) • p = p0 + gh • Example: How deep in water is the pressure equal to twice the atmospheric pressure?

  10. Absolute Pressure

  11. Buoyancy and Archimedes Principle • The buoyant force is equal to the weight of the displaced fluid.

  12. Buoyancy and Archimedes Principle II

  13. Q14.3 A cylinder is completely filled with water. The top of the cylinder is sealed with a tight-fitting lid. If you push down on the lid with a pressure of 1000 Pa, the water pressure at the bottom of the cylinder A. increases by more than 1000 Pa. B. increases by 1000 Pa. C. increases by less than 1000 Pa. D. is unchanged. E. The answer depends on the height of the cylinder.

  14. Q14.2 Concept Question A block of ice (density 920 kg/m3) and a block of iron (density 7800 kg/m3) are both submerged in a fluid. Both blocks have the same volume. Which block experiences the greater buoyant force? A. the block of ice B. the block of iron C. Both experience the same buoyant force. D. The answer depends on the density of the fluid.

  15. Exam Scores

  16. Curved Exam Scores

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