In the recent physics courses, the students have embarked on an interesting and challenging exploratory journey - they are diving deep into the knowledge related to buoyancy and pressure. This part of the content is not only an important knowledge point in the subject of physics but also closely connected to daily life. In order to give you a better understanding of your child's learning situation and help your child consolidate what they are learning at the same time, we have specially prepared this issue of the bulletin, hoping to join hands with you to assist your child in navigating the ocean of physical knowledge.

In the teaching section about buoyancy, starting from Archimedes' principle, we helped the students to understand that an object immersed in a liquid is subjected to an upward buoyant force, and the magnitude of the buoyant force is equal to the gravity of the liquid it displaces. Through the formula F=ρVg, the children are able to calculate the magnitude of the buoyant force. In addition, they also studied the floating and sinking conditions of objects. When the buoyant force is greater than gravity, the object floats upward; when the buoyant force is less than gravity, the object sinks; when the buoyant force is equal to gravity, the object suspends or floats.

In the part of pressure, we focused on learning about solid pressure, liquid pressure, and gas pressure. In solid pressure, we understood the influence of the force and the area of application on the magnitude of the pressure and mastered the pressure formula p = F/S. In terms of liquid pressure, we explored the characteristics of the pressure inside the liquid, such as the fact that there is pressure in all directions inside liquid and the pressure increases with the increase of depth, etc. We also learned to use the formula p=ρgh to calculate the liquid pressure. For gas pressure, by combining with the phenomena of atmospheric pressure in daily life, such as using a straw to suck a drink and a piston water pump, we let the students feel the existence and function of atmospheric pressure.

During the learning process of these two chapters, the students were very active in their thinking. They thought about diving and realised that if they want to dive very deep, they need special diving suits to resist the water pressure. They also discussed topics they were interested in, such as why hot air balloons can fly into the sky. These discussions enabled the abstract knowledge in books they have read to leave vivid images in their minds, helping them better understand and apply the course content.