Keywords: compass small production primary school grade one

This article applies to: the first grade of primary school.

Composition source:

This diary is about the first grade of primary school. The title is "Small Production-Compass". Everyone is welcome to contribute.

Small production-compass

In the afternoon, Teacher Zhang informed one thing: "In order to participate in the Science and Technology Festival, every student is required to make a small science and technology production as much as possible." Then, the teacher told us a true story: a fifth-grade student in our school invented and made a "magic blackboard eraser", that is, a small bag was installed on the ordinary blackboard eraser, and the dust fell directly into the bag when cleaning the blackboard. It seems simple, but it has played a great role in reducing the harm of dust to teachers and classmates.

I worship that big brother too much, so what should I do? Science, still practical?

I was reviewing my math paper in the evening, and a question gave me a hint. The topic is this: The pig is playing in the forest, so he can't find his way home. All he knows is that his home is in the north of the forest. Please help him lead the way. Then I quickly found the pig's home according to the orientation law of the plane map, "up north and down south, left west and right east".

So, I decided to make a compass!

Props: cardboard, pins, sewing needles, magnets, scissors, double-sided adhesive, transparent adhesive, compasses and oil pens.

Step: 1. Draw a circle with the diameter of 120mm on the cardboard with the compass as the bottom plate and cut it out.

2. Insert a needle at the center point (prick your hand carefully) and pass through the bottom plate, so that the needle tip is exposed from the disk surface as the center axis.

3. Fix the sewing needle on the oil pen head as a pointer and make it rotate flexibly.

4. Rub the pointer repeatedly with a magnet to magnetize it.

5. Color one end of the pointer red and place it on the central axis.

6. The pointer will always point to the south.

Why? -It's made according to the magnetic principle. The earth we live in is a magnetic celestial body. There is a huge attractive magnetic field at two levels of the earth. Influenced by geomagnetism, the magnetic needle points to the south pole and the north pole respectively.

Note: When using, don't let the pointer touch the strong magnet, otherwise it will affect the correct pointing of the compass.

(Postscript): Because some steps can't be done well by ourselves, this small production was completed with the help of my mother and uncle. When making pointers, we always fail, some because the pointer is too heavy, some because the pointer is unbalanced ... but we didn't give up and couldn't try again once. We finally succeeded after trying six times.

Don't all scientists and inventors succeed after countless failures? So I firmly believe that as long as "there is confidence and action, there will be gains!"

(

Mom): Compass is one of the four great inventions in ancient China. It is of great use in daily life. My son made a compass by himself through a math problem. Although it is not an invention, it is also a scientific exploration. Small inventions and creations are all explored from life practice. Let children contact science through their own hands, and let them have a preliminary understanding of some scientific principles. When they see these amazing little works made by themselves, children will feel a sense of accomplishment and gradually become fascinated by these sciences, and they will try to guess why. Then, as parents, please don't rush to tell your children the answer, but patiently accompany them to think and explore together.

Of course, not every small experiment or production can be successful at once. You may often fail, but it doesn't matter. You don't have to take it too seriously and don't lose heart. Try a few times and you will succeed.

Whether Einstein, who put forward the theory of relativity, or Edison, the inventor, their interest in science was cultivated in the process of communicating with their parents. These seemingly simple scientific productions that can bring magical power in life can bring so many surprises. Then, let every parent-child interaction between parents and children, let children get close contact with scientific knowledge, which is fun and incredible, and let children fully feel the power of Einstein's "invisible and intangible"!