I came home and took out the materials: a handkerchief, rope and two nuts. I started to do it: first tie a rope to one corner of the handkerchief (as do the other three corners), then tie four ropes and two nuts together, and finally unfold the handkerchief to see if it can bulge.

Try it? I held the parachute in a ball and threw it into the sky. I saw the handkerchief stop and the nuts fell off quickly because they were heavy. I put my hand down, my handkerchief suddenly unfolded and the falling speed of nuts slowed down. I saw the parachute drop. Wow! That's weird. How did this happen?

As far as I know, it is because of the principle of hot air rising. When the parachute rises to a certain extent, the ground gravity is equal to the rising power of hot air, so it hangs in the air, while the nut falls because its weight plus ground gravity exceeds the rising power of hot air, so it falls. Just as the nuts fell, the handkerchief was opened. Because the weight of the nuts and the gravity of the ground exceeded the rising force of the hot air, only a part of the hot air made the handkerchief open and the parachute slowly descended.

I looked at the reasons mentioned in the extracurricular books, and it turned out that there was only one guess I didn't say; When the parachute descends, the wind will blow in the opposite direction, so keep the handkerchief open.

I learned another knowledge today, but most of it was learned by asking questions to others and reading a lot (you should study hard at ordinary times and ask more questions to learn more knowledge! )。

Today's experiment taught me a little truth: no matter how heavy things are, they may fall later than light things.