`AirplanesSandra E. Broomes              Sherman                                1000 W. 52nd Street                               Chicago IL 60609                               (312) 535-1757Objectives: Designed for Grades 2 & 3.  To develop and experiment with flying.  To understand basic principals of energy of motion.  To make and fly paper airplanes. Materials Needed:Materials listed are for groups of four.paper      penciltapepaper clipspop cans (empty)stringtoy helicopterballoon             Strategy:Take two sheets of paper the same size.  Crumple one of the papers into a ball. Hold the crumpled paper and the flat paper high above our head.  Drop them both at the same time.  The force of gravity pulls them both downward.  Which paper falls to the ground first?   What seems to keep the flat sheet from falling quickly? Draw a picture of a plane on the board.  Write the word lift above the plane.  We say the wings give a plane lift and makes a plane go up.  Gravity below, drag behind and thrust in front.  Ask the students what these words mean.  These four forces are always working on paper planes as well as real airplanes. Take a balloon blow it up and let it go.  This will show thrust which makes the balloon zoom across the room.  The students will experiment with blowing between the two empty pop cans.  We discuss the Bernoulli's  Principle. Each group will make a helicopter and fly it off the 3rd floor.  We will go on to make several different styles and designs of paper planes. Performance Assessment:Work in groups of four and discuss answers to the questions.  Write down results on how planes were made and how long they were able to fly.  Did their helicopter fly when launched?   Which way did it fly?   Students will have the actual paper helicopter and plane as the result of the experiment. `