For a few days now, our class has been learning about aircrafts and forces of flight. For the first part of the project, we build two paper airplanes. This was fun and I tried two different ideas. One of them didn’t fly well, and one of them flew amazingly. It was pretty short, cut through the air very well, and it didn’t have much lift, but not much gravity, so it was very fast. Its push was great, and there was little drag. It was pretty simple to make, and I definitely recommend. I think I will have long thin wings for my wood plane, and a very pointy nose because it helps it cut through the air.

The past few days, we have been learning about physical properties, and how they affect different objects. I chose to watch “How Mirrors are Made”, and I was very interested in the results. Mirrors tend to be fragile but strong at the same time, and here are some reasons for that.

1. The mirror has a lot of tensile strength, if you pull it, it won’t break easily.

2. On the other hand, it doesn’t have a lot of compressive strength, if you press down on it.

3. It isn’t ductile, it doesn’t stretch.

4. It isn’t very malleable, it would just shatter with compression.

5. Not resilient, very hard and doesn’t bend or anything

6. Can’t be molded at all

7. Can’t be formed.

8. Mirrors can rust or get dirty so you can’t see a clean reflection anymore.

9. Makes a clicking sound when struck

 

With these clues, we know that the mirror isn’t very flexible altogether. And thats what I learned!