For the ping-pong ball activity, it was quite interesting and fun as we had to think of ways to let the ping-pong ball float up as high as possible by using a balloon, two pieces of A4 papers, scissors, ping-pong ball and a roll of tape. After discussing with my teammates, we tried rolling up a piece of A4 size paper into a cylindrical shape and we blowed up the balloon. Next, we placed the opening of the balloon in to the bottom opening of the cylinder shape paper but it did not work as the air escaped from the gaps.
After that we tried another method, which was rolling the paper into a smaller roll and used tape to tape the opening of the balloon and the bottom opening of the paper together but the ping-pong ball did not float up. After trying out different methods, we gave some thoughts to it and we think that there might not be enough pressure to push the ping-pong ball up.
So we tried again, this time, we tried cutting the paper into a smaller piece and roll the paper up to a smaller roll and tape the balloon on it. After releasing the opening of the balloon, we squeeze the balloon to force the air to come out faster. This way, the air will have more pressure to reach the ping-pong ball faster and the smaller the area for the air to pass through, the more force the air needs to squeeze into the bottom opening of the paper and so it can create more thrust. By doing this, the ping-pong ball can fly higher. At last it worked. Although the ping-pong ball did not manage to fly very high but it managed to float in the air constantly and also quite stably. From this activity, I learnt that the size of the cylinder could affect the airflow causing the ping-pong ball to float higher and more stable.
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