Electrified Newspaper Thinking: Without glue, tape and other adhesives, the newspaper can be stuck on the wall and will not fall off. Do you know why? Materials: 1 pencil; 1 newspaper. Steps: 1. Unfold the newspaper and lay it flat on the wall. 2. After quickly rubbing the side of the pencil on the newspaper a few times, the newspaper will not fall off as if it is stuck to the wall. 3. Lift up a corner of the newspaper and then let go. The lifted corner will be sucked back by the wall. 4. Slowly peel the newspaper off the wall and listen for the sound of static electricity. Instructions: 1. Rub the pencil to electrify the newspaper. 2. The charged newspaper was sucked to the wall. 3. When the air in a house is dry (especially in the winter), if you peel newspapers off the walls, you'll hear a static crackling sound. Creation: Please give it a try. Is there any other item that can be stuck to the wall using static electricity without using adhesives? Thoughts on the separation of pepper and salt: I accidentally mixed the kitchen seasonings: pepper and salt together. What should I use? How to separate them? Materials: pepper, salt, plastic spoon, small plate Operation: 1. Mix salt and pepper together. 2. Use chopsticks to stir evenly. 3. Rub the plastic spoon on the clothes and place it on top of the salt and pepper. 4. The pepper adheres to the spoon first. 5. Move the plastic spoon downward slightly. 6. The salt will stick to the spoon. Explanation: The reason why pepper is electrostatically adsorbed earlier than salt is because its weight is lighter than salt. Create: Can you use this method to separate other mixed ingredients? Thinking about charged balloons: Under what circumstances will two balloons attract each other, and under what circumstances will they repel each other? Materials: 2 inflated balloons, 1 string, 1 piece of cardboard Operation: 1 Inflate the two balloons separately and place them between Knotted at the mouth. 2 Connect the two balloons with string. 3. Rub the balloon on your hair (or sweater). 4 Lift the middle part of the string, and the two balloons immediately separate. 5 Place cardboard between two balloons and the electricity on the balloons causes them to be attracted to the cardboard. Explanation: 1 The electricity on one balloon repels the electricity on the other balloon. 2 The electricity on the two balloons causes them to be attracted to the cardboard. Creation: Can you use other small experiments to show that the balloon is charged? Lovely watermark Thoughts: How are the beautiful patterns on rice paper made if they are not drawn? Materials: 1 washbasin, 1-2 pieces of rice paper, 1 chopstick, 1 cotton swab, 1 bottle of ink, water (about half a basin) Operation: 1. Pour half a basin of water into the basin and dip the ink into the basin. If you lightly touch the water with your chopsticks, you will see the ink expand into a circle on the water. 2. Take a cotton swab and rub it on your scalp two or three times. 3. Then lightly touch the center of the ink circular pattern to see what happens. 4. Gently cover the calligraphy paper on the water, and then slowly pick it up. What pattern is printed on the paper? Explanation: 1. When the cotton swab is touched, the ink will expand into an irregular circle shape. 2. The small amount of oil applied when the cotton swab is rubbed on the scalp will affect the force of water molecules pulling each other. 3. The watermark will appear in an irregular concentric circle shape. Create: Try other ways to change the shape of the ink on the water. The splitting and rejoining of water flow. Thinking: Why do multiple streams of water turn into one stream of water when you touch it with your hand? Materials: One tin can box, awl, water Operation: 1. Use a nail to drill 5 small holes in the bottom of the empty tin can box (the intervals between the small holes are only about 5 mm). 2. Fill the jar with water. The water will flow out from the 5 holes in 5 streams. 3. Use your thumb and index finger to twist the water flows together. 4. After taking your hands away, 5 strands of water will merge into one strand. 5. If you wipe the small hole on the can with your hand, the water will turn into 5 strands again. Explanation: The surface tension of water causes the water flow to divide and merge.