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Jan Cathey Siegel High School catheyj@rcs.k12.tn.us. Standards. Developer Page. Developer Page. Assessment White Board Presentation of Answer to Challenge Question. Lawnchair Larry.

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  1. Jan Cathey Siegel High School catheyj@rcs.k12.tn.us Standards Developer Page

  2. Developer Page Assessment • White Board Presentation of Answer to Challenge Question.

  3. Lawnchair Larry Lawrence Richard Walters, nicknamed Lawnchair Larry or the Lawn Chair Pilot, (April 19, 1949 – October 6, 1993) was an American adventurer. He took flight on July 2, 1982 in a homemade aircraft, dubbed Inspiration I, that he had fashioned out of a Sears patio chair and 45 helium-filled weather balloons. He rose to an altitude of 16,000 feet (3 miles) and floated from his point of origin in San Pedro, California into federal airspace near Long Beach airport. The account of his flight was widely reported in newspapers. The feat is noted as an urban legend, albeit one based on actual events http://en.wikipedia.org/wiki/Larry_Walters Photo: http://www.truthorfiction.com/rumors/l/lawnchairlarry.htm

  4. Photo: http://www.truthorfiction.com/rumors/l/lawnchairlarry.htm Walters surprised an airline pilot, who radioed the control tower that he had just passed a guy in a lawn chair with a gun. The weapon was to shoot balloons and descend. Walters paid a $1,500 penalty for violating air traffic rules. http://www.katu.com/home/video/8399237.html

  5. Darwin Award Lawn Chair Larry 1982 Honorable MentionConfirmed True by Darwin Lawn Chair Larry  1982 Honorable MentionConfirmed True by Darwin http://darwinawards.com/stupid/stupid1998-11.html

  6. Oregon Man Takes Lawn Chair up to 13,000 feet http://www.katu.com/home/video/8399237.html DO NOT DO THIS AT HOME!!!

  7. Draw a Force Diagram of Larry floating at 16,000 ft. (Ignore the Wind)

  8. Draw a Force Diagram of Larry floating at 16,000 ft. (Ignore the Wind) Buoyant Force LARRY Weight of Larry and Balloons (mg)

  9. Buoyant Force is defined as the upward force on an object from the fluid. Buoyant Force What causes the Buoyant Force? LARRY Weight of Larry and Balloons (mg)

  10. The upward forces from pressure against the bottom of a submerged object are greater than the downward forces against the top. Difference in pressure (force) between the top and bottom is buoyant force Pressure greater at lower depths

  11. How does the volume of liquid displaced compare to the volume of the stone?

  12. Buoyant force is equal to the weight of the body of fluid whose volume equals the volume of the original submerged object – Archimedes’ principle Buoyant Force = Weight of displaced Fluid Weight of Fluid = (Mass of Fluid)(g) g = 9.8 m/s2 or 9.8 N/kg Mass = (Volume)(Density) Buoyant Force = (Volume)(Density)(g) If you know the Buoyant Force, you can calculate either the Volume or Density of the surrounding Fluid!

  13. Group Challenge!!! Find the Density of a Balloon without using any devices to measure volume.

  14. Find the Density of the Balloon Instructions Find the Density of the Balloon. The Balloon is a 20 cm air filled balloon on a stick (purchased from Krogers). Here are the available materials: a bucket of water, papertowels, pulleys, pulley clamps, a ringstand, string, a large mass set and a triple beam balance.

  15. Find the Density of the Balloon. Hints Measure the mass of the balloon first. Find a way to calculate the volume of the balloon. Use a Force Diagram to help you see the relationship between the forces involved. Build your pulley system before you add water to the bucket. You might need to use a density table.

  16. White Board Presentation must include • Force Diagram • Data • Calculations • Results • Comparison between density of your balloon and the density of air at room temperature.

  17. Teacher Page (Possible solutions) • Student can use paper towels to absorb the displaced water from a completely filled bucket and measure the mass of the displaced water to calculate the volume of the of the balloon. • Students can design a pulley system that pulls the balloon under the water but keeps the masses out of the water to find the buoyant force on the submerged balloon. They can use the buoyant force to calculate the volume of the balloon.

  18. How to set up a possible pulley system Balloon Pulley Mass String bucket Use ring stand and clamps to support pulley system

  19. Podcast Possibility • http://yourneighborhoodstage.libsyn.com/index.php?search_string=Lawnchair&Submit=Search&search=1 • http://www.markbarry.com/

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