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Product Name: KX1945 Portable Balance

Product Code: KX1945
Size: 600*100*420mm
Weight: About 180g
Material: Wood + Plastic Components + Metal Hardware Components
Color: Wooden color
Battery Required: No
Packing: 200pcs
Box Specification: 600*450*550mm

Archimedes once said, "Give me a place to stand, and I will move the earth." In real life, although no one can actually move the earth, with the help of this lever, we can move a lot of weight. Let's see how levers can make work easier through the following experiment.

Experimental Objective: 1. To investigate the conditions and laws of lever balance.
2. Understand the relationship between a scale and a lever.

Principle Application: Principle of the Isosceles Lever

Have you seen a balance, which is essentially the same as a scale? It's used for weighing objects. However, electronic scales are now more accurate, so balances are less common in daily life. But when we study physics, we will encounter balances. Today, let's make a toy small balance by ourselves and take a look at the specific steps. You can also try it yourself. We can use this simple and ancient tool, the balance, to show children how the weights of objects are related. With some common household items, we can easily make a balance and learn how to compare objects, measure skills, and estimate skills.

Knowledge Principle:

Compared to attributes such as length and capacity, the judgment of weight is more subjective. Children find it difficult to see the relationships between objects. Some things are heavier simply because they look heavier.
The balance, a kind of measuring instrument. It is formed by the support point (axis) supporting the balance beam in the center of the beam to form two arms, each arm hanging a plate, one plate with a known mass object, the other plate with the object to be measured, the deflection of the pointer fixed on the beam without swaying and pointing to the central scale is the mass of the object to be weighed. The balance is an isosceles lever. The balance is a measuring instrument for measuring the mass of the object. It is made based on the principle of the lever, with a small plate on each end of the lever, one end with weights, the other end with the object to be weighed, and a pointer in the center of the lever. When the two ends are balanced, the masses on both ends are equal. Modern balances are more and more precise and sensitive, and there are more and more types. There are ordinary balances, analytical balances, constant analytical balances, micro-analytical balances, semi-micro-analytical balances.

The invention of the balance scale is very old. In the Nile Delta of Egypt, there is a kind of aquatic plant that is very similar to the reeds that grow in many water-rich areas of our country. By stripping the stem layer by layer and tearing it into thin slices, it can be used for writing. This thing is called papyrus. Many of the words in European languages that are related to paper evolved from the Latin word for papyrus. Books written on papyrus are called papyrus books, which have become important historical documents of ancient Egypt. The situation of ancient Egypt that we know now, especially the historical development of science and technology, is mostly derived from the records on papyrus. Of course, the characters on the papyrus are not modern characters, but a kind of pictographic characters, which have taken many experts to study to understand. According to the records of papyrus books, the Egyptians have been using the balance as early as more than 1500 years before Christ, and some people say that this time is even earlier, about 5000 years before Christ. Although the ancient Egyptian scales are very crude, they have already had the outline of modern scales, becoming the prototype of modern scales.

This balance is made by drilling a hole in the middle of a vertical stick and crossing a stick through it. On both ends of the stick, each is suspended with a rope and a plate. This balance has been used for a long time until about 500 BC, when the "pole balance" appeared in Rome. The pole balance maintains the balance of the weight of the object by moving the weight to the opposite end. In fact, it turns the fixed end of the balance (where the weights are placed) into a movable one. The advantage is that you only need one weight, whereas the weights for the balance need several. The pole balance is also suspended with a rope and a weight, except that one end can move. The basic form is the same as the balance.

People feel that it is very troublesome to use a rope to hang a plate during the process of using a balance and pole scale, and it is very inconvenient to use. Therefore, some people wanted to remove this annoying rope. In the mid-17th century, the French mathematician Robert Bar invented the swinging tray balance. The invention of the tray balance is considered a significant improvement on the ancient hanging balance. So far, the tray balance is still widely used. Compared with the tray balance in the 17th century, it has been greatly improved. The balance beam supports two scales at both ends. These two parts constitute the skeleton of the tray balance, reflecting the basic design principle of the tray balance. When the beam is balanced, the moment is equal, F1L1F2L2, F1m1g, F2m2g, L1L2, so m1gL1m2gL2, m1m2, which means that the mass of the object to be weighed can be determined based on the known mass of the known weights. 6 is the pointer, 7 is the scale, and the pointer is aligned with the center of the scale to indicate that both ends have reached balance. 4 is the beam scale, 8 is the beam, and 5 is the zero-adjustment nut. Along with the balance is a set of weights. It should be noted that the invention of the pan balance did not make the hanging balance disappear from history, on the contrary, the hanging balance is not only still in use by people, especially scientists, but is also continuously improved. Most of the precision balances widely used today are hanging balances, while pan balances are used more in daily production and life, and are mostly used in weighing with less stringent requirements in scientific experiments.

Zhejiang Jianyi Education Technology Co., Ltd.
Zhejiang Jianyi Education Technology Co., Ltd. (formerly Yifei Toy Factory)Established in 2007, the current brand "XING TEACHER" and "JIAN YI". Over the past 10 years, our company has made unremitting efforts to make the enterprise gradually mature; Our company is a member of the Ministry of Education Teaching Equipment Industry Association, a backbone enterprise of Zhejiang Province Teaching Equipment, and the company has been awarded the "Heavy Contract and Credit-Keeping" unit for three consecutive years by Jinhua City. In 2014, it was awarded the "Jinhua Teaching Instrument Industry Advanced Collective" by Zhejiang Province.
Zhejiang Jianyi Education Technology Co., Ltd. is a high-tech enterprise that integrates modern scientific research and development of educational equipment, curriculum design, teaching resource integration, and technical services. Zhejiang Jianyi Education Technology Co., Ltd., with high-tech products and modern educational equipment, has established itself in the education industry. Our products are sold all over the country and have been exported to Europe, America, Japan, and South Korea. After years of accumulation, the company has begun to take shape. In terms of technological innovation, the company has professional design personnel engaged in the research and development of complete sets of educational products and the upgrade of existing products; in production, management, and installation services, the company strictly implements the ISO9001 international quality assurance system standards; in marketing, the "Xinglaoshi" products have been entered into many provinces and cities in the country and enjoy a good reputation; for many years, it has provided high-quality, advanced, professional series of modern teaching equipment and professional equipment research and development custom services for the education industry. With excellent, high-quality professionals and perfect after-sales service quality, the company has established a good corporate image. The "Xinglaoshi" educational physics series, chemistry series, photovoltaic, wind energy, geography, biology, art, and other products have been successfully bid for many times in the education bureau tenders. Zhejiang Jianyi Education Technology Co., Ltd. will continue to adhere to the business philosophy of "quality is the best, service is the most diligent, and being honest in life," and adhere to the development policy of "Xinglaoshi" culture, brand, and career. To provide excellent equipment and high-quality services for school teaching and research.We are willing to work closely with new and old friends at home and abroad, join hands to move forward, and devote our utmost efforts to serving education and contributing to educational causes.

Before assembling, please check if the circuit is unblocked and all the components are complete. Ensure that all contact points are in good contact. During the assembly process, be careful not to get glue on your clothes or skin. Keep the parts out of reach of younger siblings to prevent accidental ingestion! Do not play with them on your head, to avoid the model falling and injuring you!