What I have done in this Ping Pong Ball exercise was to think of the idea and practice it out with the help of my group mates.
At first, when teacher told us to blow the Ping Pong ball as high as possible using one balloon, a pair of scissors, a roll of scotch tape and two pieces of A4 paper, what came to my mind is to have the aid of the trust from the balloon to push the Ping Pong ball up.
Depending on this idea, one of my group mates began to blow the balloon. But how to use it to blow the ping pong ball was the problem. And I thought we should use a cylinder to connect the ball and the balloon and to make the air concentrated thereby deliver the air from the balloon to the ball. Then I and my group mates began to roll up the paper and tape it. We put the ball on the top of the cylinder and adjoined the cylinder with the mouth of the balloon. We tried once, when we let go the mouth of balloon, we found that the ping pong ball could not fly very high, we felt very frustrated. But teacher’s suggestion reminded us to make the cylinder shorter. We made another shorter cylinder and tried again, then it was more successful and the ball was quite stable in the air.
I realized that shorter cylinder could make the ball fly high. Because there would be less friction and the less air would be lost in the cylinder.
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