First grade diary: small production - compass

Essay Title: Small Productions - Compass

Keywords: compass, small productions, first grade, elementary school

This essay is suitable for: first grade, elementary school

Source of Composition:

This diary entry is for the first grade of elementary school, and is titled: "Small Productions --Compass".

Small production - compass

In the afternoon, Mr. Zhang notified a thing: "In order to participate in the Science and Technology Festival activities, each student is required to try to do a small production of science and technology! ". Then, the teacher told us a real thing: a fifth-grade student in our school, invented and produced a "magic blackboard eraser", that is, in the ordinary blackboard eraser installed a small bag, in the erasing blackboard dust falls directly into the bag. Seemingly simple but played a great role in reducing the dust on the teacher and students harm.

I admire that big brother too much, so what do I make? Scientific, but also must be very practical?

In the evening, I was reviewing my math paper, and there was a question to give a hint, the title is like this: Piggy playing in the woods, play tired even can not find the way home, he only knows his home in the north of the woods, please help him point the way. And then I was according to the flat map of the law of orientation "north, south, left, west, right, east" quickly find the home of the pig.

So I decided to make a compass!

Props: cardboard, tacks, sewing needles, suction cups, scissors, double-sided tape, transparent tape, compass, grease pencil.

Steps: 1. Draw a circle with a diameter of 120mm on the cardboard as a base and cut it down.

2. Insert a large head pin at the center point (be careful of sticking your hand) and pierce through the base plate, exposing the tip of the pin to the surface of the plate for the center axis.

3. Fix the sewing needle on the grease pencil head as a pointer and make it flexible.

4. Magnetize the pointer by rubbing it repeatedly with a suction stone.

5. Paint one end of the pointer red and place it on the center shaft.

6. The pointer will then always point south.

Why? - - It is made according to the principles of magnetism, the earth we live on is a magnetic celestial body, the two levels of the earth have a magnetic field of great attraction, the magnetic needle is subjected to geomagnetism, pointing to the south pole and the north pole respectively.

Note: When in use, do not let the pointer touch the magnet with strong magnetism, otherwise it will affect the correct pointing of the compass. When we were making the pointer, we always failed, some because the pointer was too heavy, some because the pointer was not balanced ...... However, we did not give up, once failed to do it again, and finally succeeded after six tries.

All the scientists, inventors are not also after countless failures to achieve success? Therefore, I firmly believe that as long as "there is faith, there is action, there will be harvest!"

(

mom): The compass is one of the four great inventions of our country in ancient times, and it is of great use in daily life. My son triggered the idea of making his own compass through a math problem, which is not an invention, but it is still a scientific exploration.

Small inventions, small creations are from the practice of life, let the children through their own hands to contact science, and let the children to understand some of the initial scientific principles, see these amazing small works of their own production, the children will be very sense of achievement, and gradually for these scientific fascination, will try to guess why this is. So, please don't be in a hurry to tell your kids the answer, but be patient and think with them and explore together.

Of course, not every small experiments, small production can be successful, often may encounter failure, but it does not matter, do not take this too seriously, do not be discouraged, try a few more times will be able to succeed.

Whether it's Einstein, who proposed the theory of relativity, or Edison, the inventor, their interest in science is not cultivated in the process of communicating with their parents from a young age. These seemingly simple, but magical power of science production in life, can bring so many surprises. So, let every parent-child interaction between parents and children, so that children close to the knowledge of science, fun and incredible, so that children can fully feel what Einstein said that "can not be seen, but also can not be touched," the power of it!