Lever rule and support

Scientific Enlightenment:

Archimedes once said, "Give me a lever long enough and I shall move the world." In reality, 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. 

Science Project:

1Recognizing the experimental equipment: small butterfly shaft, weights, nuts, small weights, fine copper wire, plastic wire, balance scale, hook, body, base, large column.   

2,Install the large pillar on the base, and then install the plumb and level on the large pillar, and the lever assembly is completed.   

3Place different numbers of weights on different positions of the balance scale, observe and record the state of the lever, what have you discovered about the law??

4，用三根塑料线头分别穿过小碟上的三个小孔挂住小蝶，（把铜线对折剪短）分别用铜丝把挂钩和三根塑料线保持相等的距离扎接，挂在天平两端的小孔内，用小OShim ring balance adjustment.   

5Place small weights and scales on both sides of the balance, making sure the balance remains level. Then, place different weights and different numbers of scales on both sides to maintain balance. What principle does this balance illustrate? In our experiment, we discovered that Please provide the Chinese text you want to translate, and I will translate it into English for you.If the weight of the measured small object and the balance do not match, the balance will tilt. If the balance is balanced, it means that the weight of the weights on the scale is equal to the weight of the measured small object.

Hint: When conducting an experiment, different weights are hung at different positions on the scale.Please provide the Chinese text you want to translate, and I will translate it into English for you.Made under the correct guidance of the teacher.

Knowledge Expansion:

    The principle of leverage is also known as the "lever balance condition." In order for a lever to be in balance, the size of the two forces acting on the lever (the effort point, the pivot point, and the resistance point) is inversely proportional to the length of their respective levers. The force of the power multiplied by the length of the power arm.="阻力 × 阻力臂"，用代数式表示为 "F = m × l"，其中 F 是阻力，m 是阻力臂，l 是阻力臂的长度。F1"·" 是一个特殊的字符，通常用于网页设计中，表示一个空格。在中文中，它通常表示一个空格，但在英文中，它通常表示一个空格。l1=F2"·" 是一个特殊的字符，通常用于网页设计中，表示一个空格。在中文中，它通常表示一个空格，但在英文中，它通常表示一个空格。12。在公式中，F1representing powerl1Representing the power arm,F2Resistance12Representing the resistance arm. From the above formula, it can be seen.To achieve balance with a lever, the force arm is a multiple of the resistance arm, and the force is one-fifth of the resistance.

Balance: A type of scale. It is formed by supporting the balance beam at the center of the axis to form two arms. Each arm is hung with a plate, one of which contains a known weight of the object, and the other contains the object to be weighed. When the pointer on the beam does not sway and points to the center scale, the deflection indicates the weight of the object to be weighed. The balance is a commonly used instrument in the laboratory. The balance is a scale, an instrument for measuring the mass of objects. It is made based on the principle of the lever, with a small plate on each end of the lever, one end for the weights, and the other for the objects to be weighed. The center of the lever is equipped with a pointer, and when the two ends are balanced, the mass (weight) on both ends is equal. These principles are well-known to those who have studied physics, and modern balances are becoming more and more precise and sensitive, with an increasing variety. We all know that there are ordinary balances, analytical balances, constant analytical balances, microscopic analytical balances, semi-microscopic analytical balances, and so on.

Scientific Inquiry:

1Observe carefully, and think about what applications of the lever principle are in our lives. Give examples.

2"What is leverage?

3Understanding the relationship between a scale and a lever: Experimental focus:

4The conditions and laws of lever balance.