1. Does anyone know of simple, simple productions with physics knowledge?
Pinhole Imaging (Simple Materials and Production)
Materials: Two paper tubes (nested inside each other), translucent plastic paper and a piece of paper with a pinhole in the middle.
Method: Install a small hole imaging paper on 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 approximately 10 cm (three Divide the three colors into three equal parts to fill un circle), then cut out a slightly larger round cardboard, and glue the tricolor round pieces of paper onto 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. Simple physical production
Original editor: lxh550376534
Simple physical production in middle school 1. Cup equipment: commonly used eggs, glue, some objects heavy and some 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 itleft to right, but always stubbornly return to the 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 "n"Don't fall"! 2. Objective of making 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). 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 that moment, the pposition where the balance weight is suspended is engraved inside the balance beam. This position is the fixing star and the zero point of the scale. mark the massFor 0.5 kg, 1 kg, 1
3. Super simple physical production
Wind power production.
Material: 1 small electric fan with propeller
Diode 1N4148.
The Nanfu Charging Tram has two sections.
Disconnect the positive and negative wires from the battery clip of the small electric propeller fan, place it outdoors in a windy place and let it spin in the wind at that time. , use a multimeter to measure the connection to the motor. Find the positive and negative poles of both wires.
Add a diode to the positive terminal and connect the black ring terminal to the positive terminal. The other end is connected to the positive terminal of the Nanfu battery clip.
Stupidjust connect the negative electrode to the negative electrode of 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.
Production: Make a small hole at the end of the egg, use a straw or any other method to remove the egg white and yolk to form a shell. 'egg more complete. 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 always stubbornly return to the vertical state. Explanation ofprinciple: The cup will not fall, on the one hand, because its structure is light at the top and heavy at the bottom, and its center of gravity is very low; moreover, when it tilts to one side, the center of gravity and the contact point on the table top are not on the same plumb 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 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"! Objective of the factorycation of a small steel construction site: 1. Exercise practical abilities 2. Deepen the understanding 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 1cm and 6cm from the thick end.
Secure 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 scale bracket, and move the hanging position until the scale is level.balance.
At this moment, the position where the weight ofthe scale is suspended is engraved inside the balance beam. This position is the fixing star and the zero point of the scale. 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 of the balance. These few The distance between the scales is uniform.
According to this rule, you can find the positions of the 2 kilogram, 2.5 kilogram and other scales on the balance beam, and divide the distance between each scale by 0.5 kilograms in 10. equal parts. The distance 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 hookthe scale. Its position is determined as follows: between the first button and the hook of the scale Use a steel rope to tie a slip knot on the rod of the scale as the second button hang a weight with the maximum weighing capacity of the first button (like 2.5 kg) on the hook of the scale; , 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 of the second button, note these two positions, which are the position of the second; button and the starting point of the second button (such as 2.5 kg). Drill holes at the position of the second button and install nails inshape of ∏ 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 a scale every 0.1 kg separately. * Calibration accuracy Once 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 support Thin sheet Heavy object Production process: Fix the shrapnel on the base and observe the approximate vibration range after it moved. 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 slicesfine in order.
Twist the shrapnel to make the thin piece fall and see that the heavy object can fall onto the support without flying away 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. Ignore the friction force of the thin plate on it. The heavy object is considered to be unaffected by the force in the horizontal direction. so the movement does not change in the horizontal direction, unable to 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 due to inertia, the heavy object maintains its original state of motion and stops in place.
Tips : In order to improveTo improve the success rate of the demonstration and make the phenomenon more obvious, you can refer to the following tips during the production process: *The elasticity of the shrapnel should 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 and reduce horizontal micro-movement of weight.
*The support surface on the support must be sufficiently wider. Considering the speed of the weight as it falls and the slightmovement 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, thin tube, small flywheel, spirit 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 out from the nozzle, blowing the flywheel to rotate. Explanation of the principle: A steam turbine is a heat engine that converts energyi.e. internal in 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 steam of water by burning water at high temperature. the steam turns the flywheel. The internal energy of the steam is converted into the mechanical energy of the flywheel.
5. How to make simple physical crafts
A cup that can walk by itself
Reflection: A cup has no legs. What does it look like? Come down from above
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, the other end is padded with some books (the height is about 5 cm)
3. Take a glass. , dip the rim of the glass in a littleof water and 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 burns at the bottom of the cup, the air in the cup gradually heats up and expands and needs to be expelled, but the rim of the cup is turned over and there is another layer. The water closes the mouth of the cup and the hot air
can't escape. He can only lift the cup a little, then it will slide under its own weight. .
Rotating lamp in the shape of a paper cup
Reflection: Why does the light of the paper candle rotate She ?
Materials: 2 paper cups, 1 toothpick, 1 candle, 1 roll of adhesive tape, 1 rope, 1 pair of scissors
< /p> < p> Operation:
1. Take a paper cup, cut out a large square mouth at each partsymmetrical to the body of the cup, 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 approximately equidistant from the body of the cup, thread a string through the center of the bottom of the cup. , and fix it with toothpicks, as the upper seat of 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 from the paper cup of the candle in the directionopposite?
Note:
Pay attention to safety when lighting candles!