1, self-made solar water heater. In this small scientific and technological work, primary school students will make a simple solar water heater with an old plastic bottle and some other materials. First, they need to collect some materials, including an empty plastic bottle, some aluminum foil, some tape and an old towel. Then, they need to wrap aluminum foil on the plastic bottle and fix it with tape.

They need to make a small hole in the bottom of the plastic bottle to let water in. Then, they need to put a towel on the other side of the aluminum foil to absorb and store heat. Finally, they need to put the equipment in the sun and let it absorb heat. When the water temperature rises, they can open the hole at the bottom of the bottle and let the hot water flow out. This small scientific and technological work can help primary school students understand how solar energy works and how to use solar energy to heat objects.

2. Homemade windmills. In this small scientific and technological work, primary school students will make a simple windmill with some paper cups and straws. First, they need to collect some materials, including some paper cups and straws. Then, they need to draw a fan on each paper cup and cut four small holes with scissors. Next, they need to insert straws into the holes of each paper cup and fix them with tape.

They can put the windmill in a windy place and make it rotate. This small scientific and technological work can help primary school students understand the power of wind and how to use wind energy to drive objects.

3. homemade water rockets. In this small scientific and technological work, primary school students will make a simple water rocket with a big plastic bottle and some other materials. First, they need to collect some materials, including a large plastic bottle, some adhesive tapes and a valve core. Then, they need to insert the valve core into the bottom of the plastic bottle and fix it with tape.

They need to fill the device with water, then squeeze the plastic bottle hard and let the water enter the rocket engine through the valve core. Finally, they can let go and let the rocket take off. This small scientific and technological work can help primary school students understand how rockets work and how to use water to drive rockets.

4. homemade electric car. In this small scientific and technological work, primary school students will use some batteries, wires and small motors to make a simple electric car. First, they need to collect some materials, including some batteries, wires, a small motor, some wood and wheels. Then, they need to connect the batteries with wires to form a circuit.

They need to fix the small motor on a piece of wood and connect it with wheels. Finally, they can connect this circuit to a small car and let it run. This small scientific and technological work can help primary school students understand the power of electricity and how to use it to drive objects.

Matters needing attention in making small scientific and technological works:

1, Safety first: Small scientific and technological works involve wires, batteries, motors and other electrical components, so safety is the primary consideration. Pupils should be careful not to let the two poles of the battery directly contact the skin, and the wires connected to the motor should not touch the metal parts to avoid electric shock accidents.

2. Sufficient preparation: Pupils should prepare all necessary materials and tools, such as scissors, tape, batteries, wires, motors, etc., before starting production. At the same time, they should also know the purpose and operation method of each material and tool to avoid making mistakes in the production process.

3. Patience and meticulousness: The production of small scientific and technological works needs patience and meticulousness, and every step needs to be carefully completed. Pupils should listen carefully to the teacher's explanation, watch the demonstration carefully, follow the steps strictly, and don't rush for success, so as not to affect the quality of the works.

4. Exploration and innovation: The production of small scientific and technological works requires not only primary school students to master basic scientific knowledge, but also their imagination and creativity. Therefore, in the production process, primary school students should actively think, explore and innovate, and try different methods and ideas to achieve the best results.