The activity was how to make a balloon car. We brought a lot of stuff like plastic bottle, bottle cap, rubber bands and plastic straw. Mr. Ben brought wood chopstick for us to use. When we make the recycle balloon car, we also thought about the mass, force, friction, and Newton’s third law. The first time, I got 140 cm far. After some fixing, my car went 40 cm further than the first time. The third time my car went 450 cm long. My car is the winner. I am the longest is the class. I think we can have better balloon. I also want to be a bit longer. If the we can make a balloon car, I want to make less mass of bottle. The next stem day, I want to have more challenge like recycle train.
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