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Authoritative PPT Summary
"Archimedes' Principle" Buoyancy PPT Courseware 5
Scenario introduction
Do these objects experience the same buoyant force? What factors are related to the buoyant force?
collaborative inquiry
Experiment 1: What factors are related to the size of buoyancy?
Experimental conjecture:
Conjecture 1: Buoyancy may be related to the density of the liquid
Conjecture 2: Buoyancy may be related to the volume of the object
Conjecture 3: Buoyancy may be related to the depth of the object immersed in the liquid
Design experiment 1:
(1) Put the eggs into clean water and observe what happens.
In clear water, eggs sink.
(2) Add salt to clear water, change the density of the water, and observe the phenomenon that occurs.
After adding salt to the clear water, the density of the salt water increases, and the egg slowly floats up until it floats.
Experimental conclusion: Conjecture 1 is correct. The buoyancy force is related to the density of the liquid.
Design experiment 2:
Observation experiment:
⒈ Immerse the same object in the same liquid.
⒉ Are the readings of the two spring dynamometers the same? What are the differences?
⒊ What changes occur to the liquid level in the container?
⒋What did the experiment illustrate?
Experimental conclusion: The size of the buoyancy force is related to the volume of liquid displaced by the object.
Design experiment 3:
(1) Put the object into clean water and observe the reading F1 of the force gauge.
The force gauge reads F1 = 2N.
(2) Change the depth of the object in the water, and then observe the reading F2 of the force gauge.
The dynamometer reads F2 = 2 N.
(3) Compare the two readings F1 and F2.
Conclusion: The size of the buoyancy force has nothing to do with the depth of the object in the liquid.
Class summary
1. Factors affecting the size of buoyancy:
The buoyancy force experienced by an object in a liquid is not only related to the density of the liquid, but also related to the volume of the liquid displaced by the object, and has nothing to do with the depth of immersion in the liquid.
2. Archimedes’ principle:
The buoyant force on an object immersed in a liquid is equal to the gravitational force on the liquid displaced by the object.
Formula: F float = G row = ρ liquid g V row
In-class training
1. How does the buoyancy force on a table tennis ball change when it rises from the water to the surface?
2. Among the following statements about buoyancy, which one is correct ( )
A. The deeper an object is immersed in a liquid, the greater the buoyant force it experiences.
B. The larger the volume of the object, the greater the buoyancy force it will experience.
C. The smaller the gravity an object experiences, the greater the buoyant force it experiences.
D. The greater the gravity of the object displacing liquid, the greater the buoyancy force it receives.
3. Use a spring balance to weigh an iron block in the air. It weighs 20 N. When part of the iron block is immersed in water, the spring scale reads 16 N. At this time, the buoyant force on the iron block is _____N. If The iron block is completely immersed in water. The buoyant force on the iron block is 6 N. At this time, the reading of the spring balance is _____ N.
4. An object is hung on a spring dynamometer and its weight is 90N. When the object is immersed in water, the reading of the spring dynamometer is 50N. The buoyancy force experienced by the object when immersed in water is _____N; if When half the volume of the object is above the water, the buoyant force it experiences is ______N, and the reading of the spring dynamometer is: _____N.
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