4/30/09

Post date: May 01, 2009 5:13:57 PM

Bell Ringer: Explain (in words) what pressure is.

• • Oobleck presentations (projects due)

  • Physical Changes district assessment

  • How airplanes work:

    • Newton's Third Law

      • For every action, there is an equal and opposite reaction

      • Plane wings are shaped and angled to push the air downward. This means that the air, in turn, pushes the wings upward

    • The Bernouli Principle

      • The faster a fluid is moving, the lower its pressure is

      • Wings are shaped so air moving on top of the wing must move farther, and therefore faster, than the air under the wing. The creates low pressure on top of the wing and high pressure below the wing. The wing, like all objects, tends to get sucked from high pressure to low pressure (upward, in this case)\

• Paper Airplane Project

  • • Write step-by-step instructions for making a paper airplane.

    • Trade these instructions with another group

    • Use the instructions you receive to try to make the plane the other group did.

    • Make comments on their instructions as to which parts were clear, and which were confusing

    • Return their instructions, and get your own back.

    • Make the changes suggested

    • At the bottom of this sheet, answer these questions:

      1. What changes did you make to your instructions? How did this help make them more clear?

      2. Explain how Newton's 3rd Law and the Bernouli Principle affected the flight of your plane

    • We will have 2 competitions for extra credit; one for farthest distance, and one for longest time in the air.

    • Projects are due no later than Monday, May 4