Required materials: a piece of plastic cloth, a pair of scissors, a thin thread of appropriate length, a small clip or other heavy objects that can be bound.

First, cut the plastic paper into squares.

Second, cut four fine threads of suitable length.

Third, tie the thin thread to the four corners of the plastic paper.

Fourth, the effect of binding is as follows.

5. Pinch four thin strips together and tie a knot at the bottom.

Sixth, cut off the extra thread.

7. Then fix the clip on the bottom of the thin thread.

Eight, put the plastic paper together.

Nine, such a parachute is completed.

Precautions:

1, when making a parachute, it is best to be square, so that it is easy to find the center point.

The length of the rope depends on the size of the umbrella cover. Usually the diagonal length of the umbrella cover is appropriate.

Tie a rope at the four corners and hang a heavy object on the rope. Fold the umbrella to reduce air resistance.

Tie the rope to the four corners of the handkerchief. Grab the handkerchief from the middle and pull the four ropes together. They should be the same length. Tie the ends of four ropes to a heavy object and tie a knot. Fold the handkerchief from the top to the heavy end, and wrap the rope around the rolled handkerchief, so that the open umbrella is subject to greater air resistance.

In this way, the handkerchief becomes a small bag. Throw this small bag into the air. When the thrown bag reaches the top, it begins to fall. At this time, the parachute will open and the object will land slowly.

When the packet is thrown upward, the air resistance is very small. After the parachute was opened, the air resistance suddenly increased, which slowed down the falling speed.

Knowledge expansion:

This experiment shows that air resistance is related to the surface area of an object. The greater the surface area of an object, the greater the resistance.