Materials required: stiff paper, a scale, paste, thread, scissors and an electric fan.
Make three card board tubes as shown below. 1. is a cylindrical tube. 2. is a square tube. 3. is a tube having the shape of dropping water. Tie up the three tubes separately on a common beam, or support. Let them hang where there is breeze; or use an electric fan. Which shape gets pushed very much and which is less? The flat surface gets pushed very much, the cylindrical tube gets pushed a little less, and the third one is the lea: t. You will notice that air resistance is very much reduced if the shapes has curved surfa­ces. That is why modern cars and locomotives, especially race cars and aero planes have got coni­cal cal and smooth curved surfaces. They have less air resistance and therefore they can move with a great speed.

TAG: air resistance, cylindrical tube, flat surface, Science Fair Experiment, Science Fair Idea, Science Fair Project, science fair projects, square tube, stiff paper