Call for Physics Mini Productions Suitable for high school level

Experiments that demonstrate the existence of atmospheric pressure.

Instrument: Two tubes with different diameters.

Steps: Fill the large test tube with water, insert the bottom of the small test tube into the water of the large test tube, and when it is inserted about halfway, quickly turn the two test tubes upside down, and as the water flows out, the small test tube will not fall off, but will rise.

This experiment was completed in less than a minute, how can you say that it took so long?!!

Put a coin in a water cup, move the coin so that the rim of the cup just blocks the coin, you keep your position still, let the other students slowly pour water into the water cup (be careful not to impulse the coin), as the water level rises, you will see the coin!

The refraction of light is used.

<> is a 12V self-flowing regulated power supply.

The regulation coefficient is quite good.

This regulator can only output up to 600 mA.

If necessary, add a heat sink to the IC.

I've been doing it since junior high school.

It depends on your qualifications.

One more. Charger production, <>

Use the principle of linear propagation of light and the reflection of light to make a diving goggle.

Dude, let's be more detailed.

Kong Ming lantern bar. That's what I do.

It's pretty simple, just a plastic bag or a plastic bag.

A pair of disposable chopsticks and a small candle.

Scissors will do the trick.

Water Rocket Pump a pump into a bottle of water and launch it when the pressure is high.

You can make an appliance for hitting the earth with an egg, it's as simple as sealing an egg fan with a plastic tube.

But it takes a lot of plastic tubes, and it's a little harder.

We've done it, and it's very creative.

A few days ago, I also helped someone write, the metal detector, the principle is Faraday's electromagnetic induction, and the phenomenon produced is called eddy current.

Find a regular solid iron block, use copper wire to wind a coil, connect AC (household 220V50Hz can be), ** the flow in the circle is the changing current, when close to the underground metal, the metal will induce eddy currents, and the magnetic field of the eddy currents will in turn affect the current in the coil, so that the alarm alarm. Oh yes, you'll also need a sensor to sense changes in current, an alarm, a stick, some wires, insulating tape, and a simple but fulfilling metal detector

1.Homemade flashlight.

The specific method of making it is to remove one end of the lid of a waste can (such as a Lulu beverage can) and knock the other end with a round hammer. Roll up two No. 1 batteries with thick corrugated cardboard and put them into the tank with the positive electrode facing up and the negative electrode facing down.

Find a suitable plastic lid (such as a magic big roll lid that can be fastened to Lulu cans) and dig a small circular hole in the lid** in such a size that the bulb is plugged in tightly. Insert the bulb base into the small hole. Take a piece of wire hunt and peel off the wire skin at both ends, wrap one end around the lamp base, and pierce a small hole through the side of the plastic cover with the other end.

Place the plastic lid over the can. Check that the bulb and battery are in close contact. At this point, the disposable flashlight is ready.

When using, use your thumb to press the wire threaded from the side wall on the weld that is not painted from the can, the flashlight will glow, and the thumb will jump off the wire, and the flashlight will go out, which is very convenient to use.

2.Homemade sun cooker.

Find a concave reflector bowl on a large flashlight, and use rigid styrofoam or wood to cut a cylinder about 4 cm long, with a diameter just enough to fit into the reflector. Drill a fine hole transversely at one end of the cylinder, insert a wire with a diameter equivalent to the diameter of the hole, and then fold the two ends of the exposed wire into 90°, leaving 5 cm each. Insert the cylinder into the hole in the reflector and insert the ends of the wire into a styrofoam or wooden baseplate.

Sharpen the two ends of a thin bamboo skewer, insert one end into the cylinder of the reflective bowl**, and insert a small piece of potato at the other end. Place the device in the sun so that the reflector is facing the sun, and then patiently adjust the length of the skewers so that the potatoes are in the right spotlight. It won't be long before the potatoes are roasted in the sunlight and give off their aroma.

Don't be so troublesome, a disposable paper cup.

A thin wire, it must be thin.

Some rosin. Tie the thin thread into many knots and make a big bump.

Make a small hole in the bottom of the paper cup, thread the thread through the mouth of the cup, and then there will be a big bump on the side of the bottom of the cup to the mouth of the cup.

Apply rosin to the thin line, hold the wall of the cup with one hand, and gently rub the thin line with the other hand, you will find that the thin line is vibrating, and then the bottom of the cup amplifies the sound.

Pip doorbell, look for the circuit diagram.

Make a simple altimeter.

It's actually a small barometer.

Find a clear glass bottle with a foam stopper with a small hole in the center.

A thin straw.

Half a bottle of water in the bottle with a straw inserted into the stopper.

The stopper should plug the bottle and the bottom end of the straw should be below the liquid level.

The whole device should ensure that there is no air leakage.

Blow electricity into the straw so that the liquid level in the tube is higher than the stopper.

Take this bottle upstairs.

Make a mark on the straw with a pen on each floor.

The height of the floor can be judged by the height of the liquid level in the straw.

You can make small motors, or you can make hand-cranked generators.

Is an electric fan OK? It's just making a small electric motor, which I've done before. It's simple.

There is a scenario that you see how...

Now vending machines are popular, which has brought great convenience to people's lives. However, with the increase of living materials, the cost of waste has also increased significantly, resulting in pollution. Can you design a machine that can automatically collect some special discard?

I envisage placing such a machine in some public place, and when people put waste into the designated entrance according to the sorting requirements, the machine will be able to do it automatically. Paid at the general market purchase price (e.g. 1 yuan per bottle) so that people will be more conscious of caring for the environment

You can refer to this idea, make a model, and demonstrate, to illustrate that some of the automation structures inside it can be solved with the help of parents or teachers and electricians.

Give me your email address and I'll send it to you.

I told you to make an improvised radio.