Once the teacher left us a special assignment-let's use waste materials to make a work with scientific and technological content.

I thought about it and decided to build a ship. When I got home, I found that the hull was abandoned foam plastic, with old toothpicks instead of steel nails, windows painted with blue water, and small red flags made of Jinlong fish oil labels. Everything conforms to the principle of waste utilization. A catamaran passenger ship was finally built.

I put the boat into the pool with great interest, but to my disappointment, it floated motionless on the water. How can I make it run? I have been thinking hard for a long time. Suddenly my eyes lit up. One day not long ago, I used some soap boxes. When the boat was playing in the bathtub, it suddenly found a soap box moving, but all the other soap boxes were floating there. I am curious. I picked it up and found a small piece of soap stuck under it. Thinking: Is this little piece of soap working? Yes, why not give it a try? I cut a piece of soap with a small knife and stuck it on the bottom of the boat, but I didn't see the boat move. Huh? What's the matter? Oh, maybe it's in the wrong place? I readjusted it several times, but it still didn't move. At this time, I am a little disheartened. Just as I was about to give up, I thought, forget it, "I have to think about it for months." Ninety-nine conclusions were wrong, but I was right the hundredth time. " Einstein's famous words echoed in my ears for a long time. Yes! How can you give up halfway? I pulled myself together and tried again and again. Finally, I dug a trough under the stern waterline and stuck a small piece of soap on it. When the ship enters the water again, wow! I saw it driving slowly straight ahead.

Looking at the moving boat, I muttered, "Why can soap make the boat move?" Hearing this, my father patiently explained, "This is because the surface tension of soap is greater than that of water." I suddenly realized.

Through this experiment, I understand that only by making bold attempts can I succeed.

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I hope my answer can help you, and I wish you progress in your study!