School-level competition on how to make small inventions

Simple small technology production

1. Screen: art and crafts: scissors, colored pens, bamboo (bamboo strips are enough), transparent tape, utility knife, pencil, etc.

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A: Cut the bamboo into two toothpick-thick bamboo strips, and then cut them into 8CM lengths. The minimum number is 5. Of course, if you want a larger screen, you can increase the length and quantity of the bamboo strips.

B: Look for colorful cardboard such as wall calendars with landscape paintings. Of course, you can also draw your own. Cut into rectangular paper strips (drawing strips) 7CM long and 3CM wide. You need four pieces at most.

C: Splice four painting strips and five bamboo strips, add one painting strip between the two bamboo strips, and use transparent tape to complete.

D: Fold the semi-finished product along the junction of the bamboo strips and the painting strips to make the screen look like a folding fan. Then let it stay like this for a few minutes, then pull it open, and a three-dimensional screen will be ready. , you can also write some famous aphorisms on it! Very nice crafts!

2. Simple wind turbine physics plus art plus production: a can, a pair of scissors, a piece of tinplate, a piece of wood, a four-wheel drive motor, a bottle of super glue, some colored LED light bulbs (or light bulbs, Diode)

A: Use scissors to cut off about 1CM from the upper part of the can, and keep the remaining can body, that is, first make a "cup", and then draw three strips at equal intervals on the cup body, and then Keep these three strips and cut off the remaining parts to create a round base with three blades, like a propeller. Then use the tip of the scissors to drill a round hole in the middle of the base that is slightly smaller than the motor's central axis.

B: There is tinplate (ordinary iron sheet) to wrap the motor tightly, and then use nails to fix it on the wooden strips.

C: Use strong glue to fix the blades on the central axis of the motor to ensure the verticality, horizontality and windwardness of the blades.

D: Connect the two wires of the motor to the LED bulb, and ensure that the wire interface connection is normal (positive and negative, good contact)

E: Hold the wooden stick and run forward quickly. Or it can be installed on a bicycle, and the wind will push the blades to rotate, and then push the motor rotor to rotate. Then magnetic electricity will be generated, and the LED bulb will light up. If the wind is continuous and stable, then with a battery There is no difference. If the wind is strong and weak, the LED bulb will turn on and off. If you add a sensitive charger, you can store the current and then release the current more ideally

1 .Rubber band powered trolley: two rubber bands, 10 pairs of disposable chopsticks (including spares), one can, one pair of scissors, utility knife, 5CM wire, beverage bottle cap, super glue

A: Will Cut out the can body, and use the cut aluminum plate to get a propeller blade by painting and cutting, and drill a hole slightly smaller than the diameter of the iron wire in the middle of the propeller blade, secure the iron wire firmly to the hole, and then Tie a knot on the wire 1cm from the center of the blade (just twist the wire), then pass it through the beverage bottle cap, and then tie a knot after passing through it, so that the two knots will firmly trap the bottle cap. Die between them (knots), and then bend the remaining wire into a hook

B: Use two chopsticks to form an isosceles triangle on the table, with the two chopsticks as the waist, and connect the two chopsticks. The intersection point of the chopsticks is called the vertex, and the feet of the two chopsticks become the bottom points. Use strong glue to glue the vertices. Glue two chopsticks of half length to the bottom points of the two chopsticks, and then glue their vertices. Then think of a dihedral angle, and then use a chopstick to glue the two vertices

C: Install a wheel with a bearing on the bottom point of the isosceles triangle in the first round, and install a wheel on the vertex , then connect the elastic band at the top of the chopsticks at the top of half of the chopsticks, install the propeller blade with the bottle cap on the top of the half of the chopsticks, adjust the length to a similar length, and hang the elastic hook on the wire hook

< p>D: Wind up the rotating blade. After it is loosened, the car will run on its own!

2. Powerful shape.

Easier than above! 3 tires, a battery box, a motor, two wires, 2 pairs of chopsticks, a bearing (bicycle spokes are enough), super glue,

A: Glue another pair of chopsticks to one end of the chopsticks 1|3, showing the appearance of a vertical line, put the bearings on the two wheels and fix them on the short chopsticks, then use strong glue to stand the battery box in the middle of the long chopsticks, and lead out two wires

B: Insert the remaining wheel on the central axis of the motor at the other end of the long chopstick, and glue the motor to the other end of the long chopstick with strong glue, which is a simple three-wheeled chopstick racing car.

< p>C: Circuit connection: It is very simple. After connecting the battery, just connect the two wires directly to the two electronic pieces of the motor (just make sure the contact is good). If you find that the car is going backwards after connecting, then Just reverse the position of the wires!