Exploring the mystery of lever: on the scientific experiment course of "lever ruler balance" for fifth grade students

Want to know how a small hook can pry the lever? Under what circumstances is the lever labor-saving, laborious or neither labor-saving nor laborious? This Thursday morning, under the leadership of the science teacher, the fifth grade students of the primary school affiliated to Nanchong No. 11 middle school carried out an experimental activity full of fun to explore the "secret of leverage balance" by using the lever ruler, bracket and hook code. They turned into little engineers and personally opened the mystery of leverage!

Build leverage and find balance

At the beginning of the experiment, according to the teacher's guidance, the students carefully installed the lever ruler support, and adjusted the lever ruler to the horizontal position for balance, so as to prepare for the subsequent experiment. Watching the lever ruler stop steadily on the horizontal line, everyone is full of expectations for the next challenge.

Hands on experiment, record data

The real challenge begins! In the experiment, the students were required to hang a certain number of hook codes on the left 4cm of the fulcrum of the lever ruler, and then try the hook codes at different positions on the right to restore the horizontal balance of the lever. We tried with concentration: hang one at 4cm on the right? Hang 2? Try 8 cm? The classroom was full of whispers of discussion and precise operation. "Teacher, I found that the positions of the hooks on the right are different, and the number of hooks required is really different!" a student reported excitedly.

Practice brings true knowledge, science accompanies growth

Through hands-on operation, observation and data analysis, the students finally came to a clear conclusion about the relationship between leverage balance and labor saving. When summing up, the science teacher said happily: "this lever ruler experiment is very successful! The students not only have good hands-on operation ability, but also have strong data analysis ability. Through hands-on, observation, recording and thinking, they really understand the conditions of lever balance, and understand the principle of lever labor-saving and laborious. This is the charm of scientific inquiry - discovering rules in practice and gaining real knowledge in thinking!"

This lively and interesting experimental lesson makes the abstract lever principle within reach. I believe that the students not only gain knowledge, but also the enthusiasm and methods to explore the scientific world!