Table tennis capable of long jump.
Thinking: Ping-pong is put in a goblet. How to blow to make the ball jump out of the goblet?
Materials: 2 goblets, table tennis 1 piece.
Operation:
1 Place two goblets side by side.
Put the ping-pong ball in the first cup.
Blow from different angles to see what table tennis is like: blow on the side of the ball; Blow into the ball.
Explanation:
1. Blow the air to the side of the ball, so that it is not easy for table tennis to jump into the second cup (or jump out).
2. Blow on the top of the ball, the pressure on the top will be reduced, and the table tennis will float. Keep blowing and jump to the second cup.
Creation: A new method can also make table tennis jump into the next cup.
A bottle that blows bubbles.
Thinking: Do you know how bottles blow bubbles?
Materials: 1 beverage bottle, 1 cup of hot and cold water, one cup of colored water, 1 large plate, 1 piece of plasticine, and several straws.
Operation:
1 Connect the straws one by one to form a long tube (the connection port is sealed with adhesive tape).
Put the straw in the bottle, seal the bottle with plasticine, and then put the bottle on the plate.
3 Bend the straw so that the other end of the straw enters the glass filled with colored water.
Pour hot water on the bottle wall, and the straw in the cup will emit many bubbles.
Pour cold water on the bottle wall.
The water in the cup will flow into the bottle through the straw.
Explanation:
1 Because the plastic bottle is very thin, heat can enter the air inside the bottle through the bottle wall.
The air in the bottle will expand when heated.
Bubbles in water are air squeezed out of a bottle when air expands.
The air in the bottle contracts when it is cold.
When the air in the bottle contracts, water occupies the remaining space.
Creation: Do you know the best way to open the bottle cap when it is too tight?
A cup that can walk by itself
Thinking: A cup has no legs. How did it come down from above?
Materials: a cup, candles, matches, glasses, two books, water.
Operation:
1. Use a glass plate and soak it in water.
One end of the glass is placed on the table, and the other end is padded with some books (about 5 cm high).
3. Take a glass, dip some water in the mouth of the glass and buckle it upside down on the glass plate.
4. Burn the bottom of the glass with a lighted candle, and the glass will come down slowly by itself.
Explanation:
When the bottom of the beaker is lit by candlelight, the air in the cup will gradually expand and be squeezed out. However, the cup mouth is upside down, and a layer of water seals the cup mouth and heats the air.
I can't run out, so I can only lift the cup a little and slide down under my own weight.
Paper cup rotating lamp
Thinking: Why do candles, paper cups and lamps turn?
Materials: 2 paper cups, 1 toothpick, 1 candle, 1 roll tape, 1 rope, 1 scissors.
Operation:
1. Take a paper cup, cut a square big mouth at the symmetrical position of the cup body, and fix a candle at the bottom of the cup as the base of the lamp.
2. The other paper cup is cut into three or four rectangular cups with fan blades at about the same distance from the cup body, and can walk by itself.
Thinking: A cup has no legs. How did it come down from above?
Materials: a cup, candles, matches, glasses, two books, water.
Operation:
1. Use a glass plate and soak it in water.
One end of the glass is placed on the table, and the other end is padded with some books (about 5 cm high).
3. Take a glass, dip some water in the mouth of the glass and buckle it upside down on the glass plate.
4. Burn the bottom of the glass with a lighted candle, and the glass will come down slowly by itself.
Explanation:
When the bottom of the beaker is lit by candlelight, the air in the cup will gradually expand and be squeezed out. However, the cup mouth is upside down, and a layer of water seals the cup mouth and heats the air.
I can't run out, so I can only lift the cup a little and slide down under my own weight.
Paper cup rotating lamp
Thinking: Why do candles, paper cups and lamps turn?
Materials: 2 paper cups, 1 toothpick, 1 candle, 1 roll tape, 1 rope, 1 scissors.
Operation:
1. Take a paper cup, cut a square big mouth at the symmetrical position of the cup body, and fix a candle at the bottom of the cup as the base of the lamp.
2. For another paper cup, three or four rectangular fan blades are cut at about the same distance from the cup body, and a rope is sleeved in the center of the cup bottom and fixed with a toothpick stick as the upper seat of the lamp.
3. Stick and fix the two paper cups up and down with adhesive tape.
4. Light the candle, pull up the rope and see what will happen.
Explanation:
1, when the candle burns, the tip of the flame is mostly upward.
2. When the air is heated, it will rise, and then flow along the fan mouth of the upper paper cup, thus causing the phenomenon of rotation.
Create:
Can you turn the candle, paper cup and lamp upside down?
note:
Pay attention to the safety of candles when burning!
Flying plastic bag
Thinking: Why do plastic bags fly in the sky when there is no wind?
Material: plastic bag (light), hair dryer 1.
Operation:
1. Open the plastic bag and turn it upside down. Put the hair dryer in a plastic bag and turn on the hot gas switch.
2. After a few seconds, turn off the hair dryer and take it away.
Let go of your hand and the plastic bag will float.
Explanation:
1. The hot air is light and the plastic bag rises upwards.
Heat energy makes objects fly, because hot air is rising. When the air is heated and rises, the hot air moves upward by convection. The heat emitted by the heater also warms the whole room by convection. Create:
Can you try making a simple hot air balloon?
air quality
Thinking: Do you know that air also has quality? How to prove that air also has quality?
Material: 1 scale, 2 balloons with the same weight, pump.
Operation:
1. Put two balloons at both ends of the balance, and the balance will remain balanced.
Pick up another balloon, inflate it, and then tie its mouth tightly.
3. Put the inflated balloon at one end of the balance and the uninflated balloon at the other end of the balance, and observe the changes of the balance.
Explanation:
1. Before inflation, the two balloons have the same mass, so they are in balance.
2. The inflated balloon increases the air quality in the balloon, so the balance is biased towards one end of the inflated balloon.
3. If it is a scale with a pointer, the air quality can be measured.
Creation: Can air quality be measured in other ways?
cloud formation
Thinking: Do you know how clouds form in the sky?
Materials: 1 cup of cold water, 1 scissors or awl, 1 box of matches, 1 straw, 1 piece of plasticine, glass bottle (the lid can be rotated).
Operation:
1 Poke a hole in the bottle cap, insert a straw in the hole and seal the periphery of the straw with plasticine.
Pour some cold water into the bottle, shake it well, and then pour out the water.
3 near the bottle mouth, light a match.
Blow out the match, throw the smoking match into the bottle and let the smoke enter the bottle.
5 Tighten the bottle cap quickly and blow hard into the bottle through the straw.
6 stop blowing, block the straw with your hand and keep the air in the bottle.
Loosen the straw, and when the air rushes out of the bottle, a cloud is generated in the bottle.
Explanation:
1. Blow into the bottle to increase the pressure.
2. After loosening the straw, the air pressure drops and the air becomes cold.
3. The water vapor in the bottle adheres to the dust particles in the smoke and condenses into tiny water droplets, many of which form clouds.
Creation: Can you make clouds in other ways?
Note: Be careful not to burn your hands with matches.
Light and rainbow