What are the handicraft scientific and technological works of primary school students?

Simple trebuchet making method for primary school students' handcrafted scientific and technological works;

Materials and tools: 6 pencils, rubber bands, mineral water bottles, knives and plasticine (optional).

1. Make the base of the trebuchet. Tie three pencils together, and the rubber band should be located one inch below the ferrule (metal part) on each pencil.

Inches.

2. Tie two pencils together with a gray rubber band and push the other pencil on top of the first two pencils.

3. Start manufacturing the launching arm. Arrange the two pencils side by side first, and then put the third pencil, which should overlap the other two pencils by about 2 inches.

Use two rubber bands to ensure a firm connection.

4. Cut off the bottom of the mineral water bottle, about 2 inches deep, and make a basket of the trebuchet.

5. Cut two holes on both sides of the basket near the base so that the pencil on the launching arm can pass through.

6. Slide the basket into the pencil protruding from the launching arm, and then tie a thick rubber band tightly at the top of the pencil. This will prevent the basket.

The function of sliding when shooting.

7. Plaster can be pasted on the basket in contact with the pencil, which helps to strengthen the basket. This is not a mandatory step.

8. Stick a rubber band about 2 inches thick at the bottom of the pencil in the middle of the base, and tie the bottom of the launching arm to the thick rubber we just made.

Below the ribs, so that the launching arm points directly above.

9. When launching, first spread the legs of the trebuchet by pushing the pencil in the middle of the base between the other two legs of the base. stretch out one's hand(s)

Place it around the base so that the palm is in contact with the middle leg, the thumb is in contact with one leg, and the finger is in contact with the other leg. Pull back empty-handed

Move the launch arm and release it. Remember to put the pellets in the basket.