1 / 19

Under Pressure

Under Pressure. NC Science Olympiad Coaches Clinic October 3, 2009 Dr. David G. Haase Professor of Physics NC State University david_haase@ncsu.edu. Overview. Event Description General event rules Overview of the subject matter Resources Examples of questions or activities

tyrone
Download Presentation

Under Pressure

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Under Pressure NC Science Olympiad Coaches Clinic October 3, 2009 Dr. David G. Haase Professor of Physics NC State University david_haase@ncsu.edu NC Science Olympiad Coaches Clinic 2009

  2. Overview • Event Description • General event rules • Overview of the subject matter • Resources • Examples of questions or activities • Time for Questions NC Science Olympiad Coaches Clinic 2009

  3. Event Description • Students will demonstrate their knowledge and skill related to the physics of fluids. • Experimental tasks and questions including calculations NC Science Olympiad Coaches Clinic 2009

  4. Under Pressure • New event about the properties of liquids and gases • Not being used in Nationals • Replaces Physics Lab C • Division B (middle school) and Division C (high school) NC Science Olympiad Coaches Clinic 2009

  5. General Event Rules • Teams of two • 50 minutes • Combination of questions and activities • May bring non-programmable calculator and one (1) 8.5 x 11 in page of notes front and back. • Students must bring and wear goggles during the event. • No other resource materials or electronic devices allowed • Where appropriate, materials data will be supplied, e.g. the density of a certain solid. • No caustic or flammable liquids will be used in this event • Disclaimer: In all disputes the rules published on the NCSO web page are the controlling authority. NC Science Olympiad Coaches Clinic 2009

  6. Content Matter • Liquids and gases • Density = mass/volume • Floating and sinking NC Science Olympiad Coaches Clinic 2009

  7. Content Matter • Pressure P = Force/area • Atmospheric pressure • Pressure as a function of depth in a liquid P = ρ g h • Barometer NC Science Olympiad Coaches Clinic 2009

  8. Content Matter • Bernoulli’s Principle: P1 + (½)ρ v12+ ρ g h1 = P2 + (½)ρ v22+ ρ g h2 • Buoyancy • Buoyant Force Fbuoyant = ρVg • Archimedes principle NC Science Olympiad Coaches Clinic 2009

  9. Content Matter • Pascal’s Principle • Hydraulic and pneumatic devices NC Science Olympiad Coaches Clinic 2009

  10. Content Matter • Charles’s Law (law of volumes) • Boyle’s Law NC Science Olympiad Coaches Clinic 2009

  11. Content Matter • Surface tension • Capillary action • Thermal expansion in liquids (Why do icebergs float?) • Viscosity and viscous forces NC Science Olympiad Coaches Clinic 2009

  12. Resources • Physics: Principles and Problems http://highered.mcgraw-hill.com/sites/0078458137/ • Conceptual Physics by Paul Hewitthttp://www.conceptualphysics.com/ • MIT Open Courseware – Physics of Fluidshttp://ocw.mit.edu/OcwWeb/hs/physics/g/index.htm • High School Physics Labhttp://hsphysicslab.blogspot.com/ • The comPADRE Digital Libraryhttp://www.compadre.org/ • Physical Sciences Resource Centerhttp://www.compadre.org/psrc/ NC Science Olympiad Coaches Clinic 2009

  13. Fluid Activities • Measure the density and determine the composition of an unknown object using Archimedes method • Predict whether an object will sink or float • Measure the rate of air flow with a water manometer made with clear plastic tubing • Design and aluminum foil boat that can flow at a certain amount of mass • Calculate the amount of water displaced by a floating object NC Science Olympiad Coaches Clinic 2009

  14. Fluid Activities • Straw and potato • Demonstrate how to blow out a candle with Bernoulli effect • Measure the relative densities of two liquids • Predict the water pressure needed to fill a tank NC Science Olympiad Coaches Clinic 2009

  15. Fluid Activities • Estimate the weight of an automobile by measuring the tire tracks. • Lift an object by inflating a balloon • Measure or estimate the flow rate of liquid through a tube • Calculate the pressure on a submerged object • Measure the relative viscosity of two liquids • Measure the compression of a gas under changes in temperature or pressure NC Science Olympiad Coaches Clinic 2009

  16. Fluid Activities • Design a hot air balloon to lift a certain weight • Design a device to measure changes in pressure • Observe a fluid phenomena and explain its physical basis • Build a paper airplane or parachute NC Science Olympiad Coaches Clinic 2009

  17. Conclusion • Questions? • How can we help you prepare? • How are you going to coach your students for this event? • Session evaluation NC Science Olympiad Coaches Clinic 2009

  18. Questions or Comments? NC Science Olympiad Coaches Clinic 2009

  19. NC Science Olympiad Coaches Clinic 2009

More Related