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There are several ways to calculate buoyancy in physics
1 weighing method
This method is suitable for the calculation of all kinds of buoyancy inquiry problems. It is often combined with spring dynamometer to solve the problem. The score is large and needs to be firmly grasped. However, the calculation formula is very simple: F floating = g object-f pulling (pulling force)
Expansion: measure the magnitude of the two forces separately, and then analyze them simultaneously
2. Cause of formation
This method only needs to master its principle, which is the cause of buoyancy. Generally, there is no calculation requirement in junior high school. Its formula is f floating = f upward - f downward (where the upward and downward force is relative to the submerged object) or F floating = f upward (this refers to the floating object). However, it should be noted in this article that if the bottom of the object is in close contact with the bottom of the container, there is no buoyancy
Archimedes method
Archimedes principle: when an object is completely or partially immersed in a liquid, it will be subject to upward buoyancy, the buoyancy is equal to the gravity it displaces this part of the liquid
This method is often used in calculation, and is generally used with equilibrium method. The formula is f floating = ρ liquid GV row
4 balance method
This method has been used in detail in the calculation of the buoyancy formula mentioned above. I just say that when floating or levitating, f is floating = G
5. Additional formula for calculating buoyancy (i.e. when the force is balanced)
G matter = m matter g = ρ matter V matter G
When floating and sinking (i.e. when the force is unbalanced)
V object = V row
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