1. Does anyone know of simple small productions with physics knowledge?
Small hole imaging (simple materials and production)
Materials: two paper tubes (phase set ) ) , translucent plastic paper, a piece of paper with a pinhole in the middle.
Method: Install a small hole imaging paper at the front end of the outer cylinder, and insert a translucent plastic paper (as a screen) into the window of the inner cylinder. Point the small hole at the scenery under the sun or light, then adjust the inner tube and you can observe the clear, reduced and inverted colorful scenery on the screen.
How to make a three-color painting: apply the three colors red, green and blue equally in three equal arcs on a round sheet of paper with a radius of about 10 cm (the three colors are divided into three equal parts (filling a circle), cut out a circular cardboardre slightly larger, and glue the pieces of tricolor circular paper to this cardboard. How to use: Shake the big wheel by hand, the big wheel drives the small wheel, and the small wheel rotates the three-color plate. When the tricolor plate spins very fast, the tricolor plate on the disk. turns white.
2. Small simple physical production
Original editor: lxh550376534
Simple physical production in middle school 1. Cup equipment: commonly used eggs, glue, some heavy materials Some objects and decorative items. Preparation: Make a small hole at the end of the egg, use a straw or other method to remove the egg white and yolk to form a fuller egg shell. Put a small weight in the egg, attach it to the bottom with glue and decorate the outside of the egg with decorations or paint as you like. Operation and phenomenon: press it from left to right, but backalways stubbornly in a vertical state. Explanation of the principle: The cup will not fall. On the one hand, its structure is light and heavy, and its center of gravity is very low. Additionally, when tilting to one side, the center of gravity and contact. The point on the table is not on the same vertical line, and gravity will make it fall to the original position, from the point of view of the lever principle, when the cup falls, it doesn't matter where the point is. 'support. gravity moment arm is shorter, moment = force * moment arm. If there is a moment, the cup will always return to its original position. In addition, the bottom is round and has low friction, making it easier for the cup to return to its original position. The roly-poly mind: As a human being, you also need to lower your “center of gravity.” Only when you encounter "external forces" can you be strong and "not fall"! 2. Objectivee the manufacture of a small steel construction site. Exercise practical abilities. 2. Deepen understanding of the principle of levers. Materials: Prepare rods, hanging hooks/plates, handles, and weights (anything with a slightly larger mass can be used). to be used). Production methods. Make one with a zero mark. For a 40cm long steel bar, drill two small holes at 1cm and 6cm near the thick end. Secure the piercing nails into the holes. Bend a hook with thick wire as a ladder hook and hang it from the first nail/or use a hanger plate to hang thicker wire from the second nail as a tie-down. Then use a thin wire to suspend a 0.25 kg weight. Lift the handle, hang the scale weight on the balance beam, and move the hanging position until the scale is balanced. At this time, the position where the weight of the ballnce is suspended is engraved inside the balance beam. This position is the fixing star and the zero point of the scale. The marked scale defines the mass at 0.5 kilograms, 1 kilogram and 1
3. Super simple physical system Made
Wind energy.
Material: 1 small electric propeller fan
Diode 1N4148.
Two sections of the Nanfu loading tram.
Disconnect the positive and negative wires from the battery clip of the small electric propeller fan and place it outside in a windy location to allow it to spin in the wind. At this time, use a multimeter to. measure the two wires connected to the motor and find out the positive and negative poles.
Add a diode to the positive terminal and connect the black ring to the positive terminal. The other end is connected to the positive terminal of the Nanfu battery clip.
Simply connect the negative electrode to the negative electrode de the Nanfu Battery.
This forms a wind energy production system. You can use wind power to generate electricity from discharged rechargeable batteries.
4. Request a small, extremely simple physics production for the second year of middle school
Cup equipment: commonly used eggs, glue, a few heavy objects, and a few decorative objects.
Preparation: Make a small hole at the end of the egg, use a straw or other method to remove the egg white and yolk to form a fuller egg shell. Put a small weight in the egg, attach it to the bottom with glue and decorate the outside of the egg with decorations or paint as you like.
Operation and phenomenon: Press it from left to right, but it always stubbornly returns to the vertical state. Explanation of the principle: The cup will not fall, on the one hand, because its structure is light in heightut and heavy at the bottom, and its center of gravity is very low plus, when it tilts to one side, the center of gravity and the contact point on the table top are not on the same wire to lead, and gravity will make it fall to the original position, from the point of view of the lever principle, when the cup falls, it doesn't matter. where the fulcrum is, although the moment arm of gravity is shorter, the moment arm = force * If there is a moment, the cup will always return to its original position.
In addition, the bottom is round and has low friction, making it easier for the cup to return to its original position. The roly-poly mind: As a human being, you also need to lower your “center of gravity.” Only when you encounter "external forces" can you be strong and "not fall"! Purpose of making a small steel construction site: 1. Exercise practical abilities 2. Deepen theunderstanding of the principle of levers. Materials: Prepare rods, hanging hooks/plates, handles, weights (anything with a slightly larger mass is acceptable). Method: Make a long rod with a zero mark. For a 40cm steelyard, drill two small holes at 1cm and 6cm near the thick end.
Fix the dowels in the holes. Bend a hook with thick wire as a ladder hook and hang it from the first nail/or use a hanger plate to hang thicker wire from the second nail as a tie-down.
Then use a thin wire to suspend a 0.25 kg weight. Lift the handle, hang the scale weight on the balance beam, and move the hanging position until the scale is balanced.
At this time, the position where the weight of the scale is suspended is engraved inside the balance beam. This position is the fixation star andthe zero point of the balance. Mark the scale. Hang objects with masses of 0.5 kg, 1 kg and 1.5 kg respectively on the hooks of the scale. Adjust the weight position of the scale so that the weight position of the steel scale is at 0.5kg, 1kg and 1.5kg. 1.5 kg scale. These few scales. The distance is equal.
According to this rule, you can find the positions of 2 kilogram, 2.5 kilogram and other scales on the scale beam, divide the distance between each 0.5 kilogram scale into 10 equal parts , and the distance between each part represents 0.05 kilograms. To expand the measuring range, in order to increase the weighing range of the steelyard, you can install another button (called second group). The position of the second button should be closer to the scale hook. Its position is determined as follows: between the first button and the hook of the scale Use a steel rope to fplace a slip knot on the scale rod as the second button; hang a weight with the maximum weighing capacity of the first button (such as 2.5 kg) on the scale hook; , and lift the rope (the rope must be able to lift at least 5 kg of weight). Move the scale weight away from the rope until the scale rod is balanced. If this position is too far from the lifting rope, you may move; the position of the lifting rope closer to the scale hook, and therefore the position of the scale weight is also closer to the scale hook. After the position, note these two positions, which are the second button position and the starting position; tip of the second button (for example 2.5 kg). Drill holes at the second button position and install ∏-shaped nails and push buttons.
Follow method 2 to find the scale positions of 3 kg, 3.5 kg, 4 kg, 4.5 kg, 5 kg, etc.., and then do scales every 0.1 kg intervals. * Calibration accuracy After the steelyard scale is calibrated, it can be calibrated with a standard scale to obtain the error range of the homemade steelyard.
Inertial demonstrator Material preparation: Shrapnel base holder Thin sheet Heavy object Production process: Fix the shrapnel on the base and observe the approximate vibration range after rotating it. Choose a suitable position to install the bracket so that the top of the bracket is within the vibration range of the shrapnel and has appropriate impact force.
Attach the rack and place sheets and heavy objects on the rack from bottom to top. Operation and phenomenon Place heavy objects and thin slices in order.
I turned the shrapnel over to drop the thin piece, and discovered that the heavy object could fall onto the support without being thrownler with the thin piece. Explanation of the principle: After being hit, the sheet suddenly changes its state of movement and flies away at high speed.
The heavy object was not touched. Ignoring the friction force of the thin plate on it, we consider that the heavy object is not affected by the force in the horizontal direction, so it does not change its movement. state in the horizontal direction and will not move. After the leaf flew away, the heavy object fell onto the stand due to the earth's gravity.
Ignoring the thickness of the sheet, the object can be considered to have no movement. Therefore, it can be said that the heavy object maintains its original state of motion and stops due to inertia.
Tips: In order to improve the success rate of the demonstration and make the phenomenon more obvious, you can refer to the following tips during the production process: * Elasticity of the shrapnel must be as good as possible. In this way, the friction time between the sheet and the object is short, and the horizontal micro-movement of the weight is reduced.
*The position between the shrapnel and the support must be carefully adjusted. If it is too far away, the impact speed given by the shards is not sufficient; if it is too close, you must prevent the shards from hitting heavy objects or supports.
*The contact surface between the weight and the shrapnel must be as smooth as possible. This can reduce friction,Reduce the horizontal micro-movement of weight.
*The support surface on the support must be sufficiently wider. Given the speed of the weight as it falls and the slight movement in the horizontal direction, if it is too narrow, the line of gravity of the weight may deviate from the support surface, causing the demonstration to fail.
Steam turbine equipment: iron box, tfine ube, small steering wheel, alcohol lamp, water. Production: Weld a thin tube to the can and cut a thin aluminum plate from the can to make a wheel with a diameter of about 5 cm.
Attach the small wheel to the thick wire and position it so that it can rotate around the frame. Fill the can with water and use an alcohol lamp to heat the bottom of the can.
Operation and phenomenon: Turn on the alcohol lamp to heat the water in the iron box, the water boils, and the water vapor continuously spurts from the nozzle, blowing the flywheel so that it turned. Explanation of the principle: A steam turbine is a heat engine that converts internal energy into mechanical energy.
In the whole process, the energy involved is converted into: The chemical energy of alcohol is converted into the internal energy of water and water vapor through combustion. High temperature water vaporure turns the flywheel, and the internal energy of the steam is converted into the internal energy of the flywheel.
5. How to do simple physical crafts
A cup that can walk by itself
Thinking: The cup has no legs, how does it go down -she from above
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Materials: A cup, a candle, a match, a glass, two books, water
Operation:
1. Use a glass plate and dip it in water
2. Place one end of the glass on the table and use some books to cushion the other end (the height is approximately 5 cm)
3. Take a glass and dip the rim in water. Place it upside down on the glass plate.
4. Use a lit candle to burn the bottom of the cup, and the glass will slowly go down on its own.
Explanation:
When the candle flame reaches the bottom of the cup, the air in the cup gradually heats up and expands,trying to get the mouth out of the cup though. is upside down, and there is another layer of water going. The mouth of the cup is closed and the hot air
cannot escape. You can only lift the cup a little, then it will slide down. under its own weight.
Rotating paper cup lamp
Reflection: Why does the light from the paper candle rotate?
Materials: 2 paper cups, 1 toothpick, 1 candle, 1 roll of adhesive tape, 1 rope, 1 pair of scissors
Operation:
1. Take a paper cup, cut a large square mouth at each symmetrical part of the cup body, and attach a candle to the bottom of the cup as the base of the lamp.
2. For another paper cup, cut out three or four rectangular fan leaves at approximately equidistant positions on the cup body. Thread a rope through the center of the bottom of the cup and secure it with a cure-tooth. to serve as a base for the lamp.
3. Glue the top and bottom of the two paper cups to secure them with tape.
4. Light the candle, pull the rope and see what happens.
Explanation:
1. When a candle burns, the tip of the flame points primarily upward.
2. The air will rise when heated, then flow along the fan blades of the paper cup above, causing rotation.
Create:
Can you turn the light in the paper cup of the candle in the opposite direction?
Note:
Pay attention to safety when lighting candles!
The function of wind power slewing bearing
The steps of making a weather vane are as follows:
1. Prepare the materials. Making a weathervane requires some basic materials, including a longer wooden or iron rodgue, a larger piece of paper, paint, tape or nails, string or thread, etc.
2. Draw a weather vane. Draw an arrow shape on the paper to represent the head of the weather vane. Draw a small triangle at the end of the arrow to represent the tail of the weather vane. Draw a few small lines on each side of the arrow to represent the wings of the weather vane. Secure the arrow and tail to a wooden or iron rod with tape or nails.
3. Decorative weathervane. Use paint to color the weather vane or add patterns to make it more beautiful and eye-catching. You can add some decorations, like small flags or ribbons, to the wooden or iron rods.
4. Install the weather vane. Choose an open area and insert a wooden or iron rod into the ground so that the weather vane can rotate freely. Use string or wire to attach the weather vane to adoes not have a wooden or iron rod to ensure stable rotation. If you need to use it indoors, you can choose a suitable bracket or hook to install the weather vane.
The functions of making a weathervane:
1. Measuring Wind Direction: The weather vane is a simple tool used to measure wind direction. By observing the direction of the weather vane, you can understand the wind direction at that time, which is very useful in fields such as weather forecasting, navigation, aviation and energy. In weather forecasting, accurate information about wind direction can help predict future weather changes; in navigation and aviation, wind direction information can help ships and aircraft better understand the heading and direction of flight; In the field of energy, information on wind direction canhelp wind power plants to improve; seize the direction of wind power and improve the efficiency of power generation.
2. Learning and Education Tool: Making a weather vane can be used as a learning and education tool. By making a weather vane with your own hands, you can better understand its structure and principles, and at the same time you can exercise your dexterity and innovative ability. In addition, weather vanes can also be used as a scientific experimental tool to measure and record wind direction at different times and locations, helping people better understand local climate and environmental changes.
3. Decoration and Artistic Expression: Weather vane making can also be used as a form of decoration and artistic expression. You can make your weather vane more beautiful and attractive by painting itpainted in different patterns and colors. At the same time, the weather vane can also be used as an independent artwork for exhibitions. Show and enjoy.
Hot-Dip Galvanized Integrated Screw Manufacturer
The slewing bearing is made up of any two parts that must rotate relative to each other and support simultaneously an axial force, a radial force and an overturning moment. . The basic element of mechanical force transmission. Its basic function is to use bolts to fix it on the upper and lower brackets of the mechanical equipment to transmit force and transmission to achieve relative rotation between the two parts of the mechanical equipment. Slewing bearings usually have mounting holes, internal or external gears, lubrication holes and sealing devices. They have the characteristics of a compact structure, a poids lightweight, good structural rigidity, smooth operation, high precision, safety and reliability.
Slewing bearings, like roller bearings, have rolling elements and rings with raceways. However, compared with ordinary bearings, they have many differences, mainly in the following aspects:
< p>① Size. of the slewing bearing is larger, its diameter is generally 0.4-10 meters, and some diameters can reach 40 meters.② Slewing bearings generally need to withstand loads from multiple aspects, not only axial force and radial force, but also large overturning moments. Therefore, a set of slewing bearings often functions like several sets of ordinary bearings.
③The operating speed of the slewing bearing is low, generally less than 50rpm. In many cases, the slewing bearing does not operate continuously, but only rotates back and forth at an angle equivalent to the so-called "slewing bearing".
④ There are big differences between slewing bearings and rolling bearings in terms of materials and manufacturing processes such as heat treatment.
⑤ Usually the slewing bearing is equipped with a ring gear for rotating drive and a dust-proof sealing device.
⑥The installation method is different. The slewing bearing is not mounted on the spindle and installed in the bearing housing like ordinary bearings, but is fixed on the upper and lower brackets with screws.
Slewing bearings are basic components of mechanical equipment and are widely used in various industries of the national economy. This product is widelyused in engineering machinery, port machinery, metallurgical machinery, mining machinery, petroleum machinery and chemicals. Machinery, medical equipment, naval machinery, light industrial machinery, environmental protection machinery, entertainment equipment, transportation machinery and military equipment and other industries. Nowadays, slewing bearings are increasingly used in energy-saving and environmentally friendly projects. For example, wind turbines require a variety of precision slewing bearings.
Can wind farms disrupt the climate?
1. Handan Guantong Fastener Manufacturing Co., Ltd.
Main. products: anchor bolts, bolts for wind power generation, embedded parts.
Address: Wuli Industrial Zone, Yongnian District, Handan City, Hebei Province.
2. Handan Yongnian District Weiyong Fastener Manufacturing Co., Ltd.
Main products: hot-dip galvanized bolts, hot-dip galvanized studs, U-shaped hoops, iron accessories, electrical fittings.
Address: Dongmingyang Industrial Zone, Yongnian District, Handan City, Hebei Province.
3. Yongnian County Pugetong Fasteners Store
Main products: machine screws; nuts; cotter pins, spring washers and square washers; hex; hex trim; electromechanical screws.
Address: Hebei Pu Feiyu Screw World, Yongnian County, Hebei Province.
4. Yongnian County Tiexi Yuze Fasteners Factory
Main products: anti-loosening anchor screw; ; bolts and nuts; flat washers;
Address: North of Dongmingyang Village, Yongnian County, Handan City, Hebei Province.
5. Hebei Chende Fastener Manufacturing Co., Ltd.
Main products: photovoltaic modules; U-shaped tie bars; Spiral Ground Stakes; hot-dip galvanized bolts; flat washers; Dacromet screw with spring washer.
Address: West of Beishikou Village, Linmingguan Town, Yongnian District, Handan City, Hebei Province.
Yes. It's a question of degree. Climate is a complex, long-lasting and sometimes extremely minor change. This will only happen when people's activities change. Isn't the current greenhouse effect a good example? Will car exhaust affect the climate? The same is true for wind power generation. Very good, and all windward sides are, the wind will stop blowing, the clouds and fog will not move, the precipitation will also change and the earth will be reshaped.