Keywords: ejection magic primary school grade three

This article is suitable for: the third grade of primary school.

Composition source:

This 400-word composition is about the third grade of primary school. The title is "Magical Ejector Model-A Short Paper on Science and Technology". Everyone is welcome to contribute enthusiastically.

Magical ejection plane model

-Scientific papers

I made an exquisite and magical ejection plane some time ago, which is very interesting and I like it very much.

That day, my father and I came to make a model ejection plane. The materials used are: a hard plastic, a cardboard, glue, scissors, a board, a rubber band and two screws. I first cut the cardboard into the shape of an airplane, then cut off two wings and put them together, and it became an airplane model. I use scissors to cut a hook on the top of the hard plastic piece, insert it in the bottom of the plane, stick it well, and the plane is ready. Dad helped me nail two screws on the top of the board, and then tied them with both ends of a rubber band, so that the plane could eject. Finally, I drew my eyes and mouth on the plane with crayons, and it was done. It sounds simple, but it is actually very troublesome to do. Looking at the model catapult plane I made, I had a triumphant smile on my face.

I can't wait to try it. Hey, that's funny! I hung the hook on the hard plastic on the rubber band and then hung it on the ejection hook of the plane with the rubber band for ejection flight. When ejecting, I want to hold the board tightly with one hand and pull the fuselage of the ejection plane with the other hand to make it fully open, so that the ejection plane can get the maximum speed, so that the plane can eject, which is very fun.

But I don't know the mystery-why can the plane pop up? I looked it up on the internet, only to know that from a physical point of view, this is a process in which elastic potential energy is transformed into kinetic energy. The plane was ejected by the elasticity of the rubber band.

This small production of science and technology really made me feel that my scientific thinking, practical ability and innovative ideas have really improved. What makes me happy is that I feel the joy of learning and the joy of success!