I made the skateboard-fan apparatus first. Then I attached fishing wire to the back of the skateboard and tied the other end of the wire to a plastic water bottle cut in half that was filled with pennies which was hung over the edge of a table. When I turned on the fan and it did not go forwards or backwards then I weighed that wire, half bottle, and pennies. That provided the pounds of pressure at 90 degrees and I did the math from those figures.
The results were superior. They worked just as planned. At 90 degrees, the skateboard lifted 3 ounces, or 33 pennies, at 60 degrees it lifted 2.6 ounces or 28 pennies, at 30 degrees it lifted 1.5 ounces or 16 pennies, and at 45 degrees it lifted 2.12 ounces, or 23 pennies. The multiplication is as follows, 3 x .707 =2.12 and 33 x .707 =c. 23, 3 x .866=2.6 and 33 x .866= c. 28, and 3 x .5=1.5 and 33 x .5=c. 16.
My experiment worked out how I thought it would and it also proved the Pythagorean Theory. My data supports my hypothesis because everything in my hypothesis corresponds to everything that turned out to be the results of the experiment. I can understand everything, except for that I still do not fully understand how at 45 degrees it can be .707 times 90 degrees, but since I proved it with math and in the actual experiment, it worked. To better my understanding, I could use the same skateboard-fan, but have a spring tied to the back of the skateboard and a wall, and do a very complicated math problem to figure out the force exerted.
This project is to prove the Pythagorean Theory and the lateral components of force by using common items such as a skateboard and a fan.
Science Fair Project done By Peter N. Fettis