Production of physics in college

Introduction Materials for making a small box of unstoppable light in middle school physics: 1 wooden box measuring 28 cm × 20 cm × 6 cm with lid, 1 power cord, 1 transformer with an output voltage of 6.6 volts, small

Production of physics in college

The Unstoppable Light Box

Materials: 1 wooden box measuring 28 cm × 20 cm × 6 cm with lid, 1 power cord, 1 transformer with an output voltage of 6.6 volts, 1 small switch, 1 light source in parallel (the constant voltage of the bulb is 7 volts), 4 plane mirrors of 6 cm × 3.6 cm, 1 partition of 14.5 cm × 3.6 cm × 0.3cm, 1 piece of 16.5cm × 3.6cm × 0.3cm baffle, 18cm × 16.5cm × 1 piece of 0.3cm cover plate. , 8 small magnets, 1 light screen.

Manufacturing method: 1. As shown in Figure 4, open a hole in the middle of the left side of the wooden box to install the switch, and open another hole. to get through it. Pass the power cord through, make a top slit at the top, and make a 1 inch diameter round hole on the upper right side.

2. Attach the power cord, transformer, switch and parallel light source to the positions shown in figre and connect the lines. Then attach 4 flat mirrors (with a small magnet on each back) and partitions.

3. Insert the baffle from the top seam.

4. Attach a small magnet to each of the four corners of the lid. The magnets must match and attract each other behind the plane mirror.

5. Cover the lid and close the lid of the wooden box.

How to use: 1. Remove the baffle and open the cover.

2. Turn on the power, and it will be seen that the parallel light source emits a beam of light from the upper right circular hole (it can be picked up by the light screen).

3. Insert the baffle from the top seam. It can be seen that the light cannot be blocked.

Multipurpose lens

Making materials: a cylindrical glass bottle with a lid, water, paper with words

Production steps: put a cylindrical bottleglass, fill it with water, close the lid tightly, leave an air bubble in the bottle and place it horizontally on the table.

Phenomena: Place a piece of paper with words under the bottle. Through the water you can see the words enlarged, which can be used as a magnifying glass, through the bubbles you can see the words reduced; , which can be used as a concave lens. If the bubbles are in the middle of the bottle, it means the table top is level and can be used as a level tester.

As it goes up, it also goes down

Making materials: a long test tube with a rubber stopper, a short test tube (the small test tube must fit into the large test tube), an appropriate amount of fine sand, an appropriate amount of water and a small piece of plastic foam, glass glue, scissors or a knife

Production steps: 1. Cut 2 corks out offoam the plastic according to the small test tube, and pierce a small hole in the middle of one of them to let the fine sand pass through.

2. Put about 1/3 of the sand from the test tube into the small test tube, then apply a little glass glue to the perforated plug, insert it into the small test tube, and stick it firmly. Finally, apply a little glass glue to the other cap and plug the mouth of the small test tube.

3. Fill the large test tube with water, insert the small test tube into the large test tube, then tighten the rubber stopper on the large test tube.

Phenomena: Raise the large test tube and when the small test tube rises, you will see sand flowing through the small holes. If the sand is dyed red and the water is light green, the appearance will be better.

Homemade “Water Rocket”

Materials: Two 25L plastic drink bottles, a bicycle valve core (canbe made from scraps from an auto repair shop) Cut from an old tire, remove the screws and pads inside), comes with hoses and nuts, two sheets of hard plastic (x-ray film can be used) , a roll of transparent tape, a pump (or electric air pump), No.4 rubber A plug (with hole, the hole diameter is about 8mm) and an iron bracket.

Steps: 1. Making the rocket head: Leave one of the drink bottles as the rocket body, cut the mouth of the other bottle with a knife and cut out the bottle body about 9cm long from the For the rocket head, use scissors to cut the bottle mouth into a zigzag-shaped notch, press it to form a smooth rocket head as shown in Figure 1, burn it with fire to make it stick firmly, and then stick a layer of transparent tape on it.

2. Producton of side wings: Use plastic sheets to cut four side wings according to the size shown in Figure 2. In order to give the rocket better stability during flight, the side wings should be taller. hardness. If the plastic part is not hard enough, you can make it by gluing two or three parts together. After cutting the side wings, alternately fold the "glue claws" on both sides and glue them symmetrically to the underside. of the rocket with transparent tape.

3. Making the Compressor Cap: Use a utility knife to cut off the thicker end of the rubber cap. The diameter of the cup is 2.3 cm. Install the valve core, pipe and nut through the small hole. , and firmly push the rubber stopper into the bottle neck so that the exposed part outside the bottle neck does not exceed about 2mm ; use scissors to cut a hole approximately 12mm in diameter in the middle of the drinks bottle cap so that only. The valve core is exposed when the bottle cap is tightened, as shown in Figure 3 illustrated.

Launching method: put about 400L water into the bottle, plug the bottle mouth tightly with the rubber stopper, tighten the bottle cap, place the rocket head firmly at the bottom from the plastic bottle, then place the rocket upside down on the iron On the iron ring of the platform, as shown in Figure 4, the water rocket is now ready to launch. Connect the air pump to the valve core, turn on the switch and inflate the bottle at the same time, pay attention to the pressure gauge reading. Stop inflating when the air pressure increases to about 0.8 MPa. pliers to inflate and slowly loosen the bottle cap. Water in the bottlebreaks the rubber stopper and spurts out at high speed. Due to the game, the rocket flies into the sky.

Homemade magnifying glass

Materials: a small broken light bulb, an alcohol lamp, tweezers and a small piece of cardboard.

Steps: 1. Use tweezers to pick up a piece of glass from the small bulb, heat it on an alcohol lamp and let it burn in a small bead-shaped glass.

2. Cool the small pearl-shaped glass.

3. Punch a hole in the small cardboard that is similar to the size of the beads and insert the small glass beads into it.

4. If you look at the object through the beads, you can see the enlarged image. Make a homemade magnifying glass.

Homemade water barometer

Materials: 1 bottle, thin glass tube, appropriate amount of colored water (red ink) (in a beaker), rubber stopper.

Steps: 1. Fill the bottle with appropriate amount of ecolorful.

2. Draw a ladder on a thin glass tube open at both ends.

3. Insert the glass tube through the rubber stopper into the water.

4. Blow a small amount of gas from the upper end of the tube to make the gas pressure in the bottle higher than atmospheric pressure, and the water will flow down the glass. The glass tube rises above from the neck of the bottle (as shown in the picture).

5. Hold it from the bottom up and observe the changes in the height of the water column.

Note: The neck of the bottle should be tightly closed and there should be no air leaks. Do not hold the bottle directly with your hands to avoid heating the bottle and affecting the gas pressure inside the bottle.

Market lantern

Production materials: iron bracket, fine wire, colored paper, kraft paper, alcohol lamp.

Prod stepsuction: 1. Use kraft paper to make a windmill blade

2. Hook the center of the blade with a thin wire and hook the top end of the wire onto the wire. iron frame with fine wire

< p>3. Use colored paper to make a cylinder with the diameter of the windmill blades

4. Glue the cylindrical paper to the paper windmill.

Phenomena: Light the spirit lamp under the completed spinning lantern and you will see the spinning lantern spinning. If you draw animals on the paper, it will look better when turned over.

Shenyang Tianyang Wind Turbine Manufacturing Co., Ltd. According to Aiqicha's request, Shenyang Tianyang Wind Turbine Manufacturing Co., Ltd. has wind turbines. Shenyang Tianyang Wind Turbine Manufacturing Co., Ltd. is located at No. 131 Changqing Street, Changqing Street, Dongling District, Shenyang City, Liaoning. Shenyang Province Tianyang Wind Power Generation Machinery Manufacturing Co., Ltd. is a professional private enterprise which researches, develops and manufactures wind turbine generators, with a registered capital of 5 million yuan. The company is located in Shenyang, an industrial city in northeast China. The company's product specifications are complete, and it has developed wind turbines of 100 watts and 1 kilowatt, as well as wind photovoltaic complementary power generation systems with the same specifications as above, special motors for wind turbines of different specifications and models, etc. The new wind water lifting product uses wind energy as energy to directly lift groundwater by driving the piston. It has a simple structure, is easy to install and operate, is safe and reliable, and can start working with secondary wind. used for more than ten years under normal conditions of use. The company now hasconstituted a service system integrating design, manufacturing, installation, commissioning, marketing and after-sales service.

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