The first and simplest triboelectricity is to prepare a plastic product such as a balloon or comb, generate static electricity through friction in animal hair, and use static electricity to absorb paper or other tiny light objects to reflect the experimental results.

The second chainsaw takes a bare wire and winds it around an arc-shaped bamboo piece. The two ends of the wire are connected with the positive and negative poles of the battery, and the resistance of the wire is high to generate heat, thus forming a simple electric saw, which can saw paper, foam and the like.

In the third low-pressure experiment, take a jar and a peeled boiled egg, light a paper bottle, and quickly cover the peeled boiled egg on the bottle mouth. After the paper is extinguished, cold water is poured outside the bottle, and the air pressure in the bottle is reduced, which is less than the external atmospheric pressure. Eggs are pressed into bottles under the action of atmospheric pressure.

Fourth, the magic toothpick.

Ingredients: toothpick, a basin of water, soap, sugar cube.

Operation: carefully put the toothpick on the water; Put the sugar cubes in the basin, away from the toothpicks. The toothpick will move in the direction of the sugar cube; Change a basin of water, carefully put the toothpick on the water, and now put the soap in the basin near the toothpick. Toothpicks will stay away from soap.

Principle: The sugar cube placed in the center of the basin will absorb some water, so there will be a small water flow in the direction of the sugar cube, and the toothpick will also move with the water flow. However, when you put soap into the basin, the surface tension at the edge of the basin is strong, so you will pull the toothpick out.