In science last week my class and I made planes. It was my favorite science unit. In this picture we are testing out Foss Planes and finding the results. And one of the people in this picture is coming back from getting a new rubber band to test.



To make them we used small straws and large straws,and two Popsicle sticks. We had to sand both of the Popsicle sticks down on one end. Then we had to punch a hole in the straw we cut in half. After that we had to take the straw that we cut in half and stick it threw the medium straw. So at that point the plane would have two straws and on the top there would be one straw sticking threw the straw we cut in half. Next we took the two Popsicle sticks and made sure they were the same Length and that the sanded down part was even. Last we took the two Popsicle sticks and put them at the end of the cut in half straws. Then we stapled the Popsicle sticks together so that they were attached to the bottom of the straw also and then we were done making it. And last we had to put a propeller on the end of the sanded down Popsicle stick.

Now it was time to experiment. For the first experiment we had to use fishing string and tape that to one end of a chair using duke tape. Then we taped the other side of the string on to another chair and also used duke tape. On one end we had to take the tape off and stick the end of the string into the straw and put the tape back on the end. Then I had to get a rubber band to put on the end of the propeller piece and on the other end of the Popsicle stick. Then i twisted the propeller 30 times and held the plane to the very end of the chair and let go of the plane. The plane took off and stopped exactly at the other end without hitting the chair hard because if it hit the other chair hard you twisted it to many times. We tested with different types of rubber band. there was a thick green, blue, yellow, white, regular, and red. Then there was a thin green, blue, yellow, white, regular, and red rubber band. Me and my partners found that the thick yellow one worked for us best.

What I learned in this unit was that you can't change more then one variable at a time because you wont know what was making the experiment different.