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"Buoyancy" PPT courseware 5
Dead Sea
Why can't they drown? Is God protecting them?
analyze
According to the knowledge of two-force balance, in addition to being affected by ________, the boat (person) is also affected by the force of water on it (him). This force is called ________.
Example 1. An iron block is hung on a spring scale. When weighed in air, the reading of the spring scale is 32 N. When the whole thing was immersed in water and weighed, the reading was 12 Newtons. The buoyant force on the iron block is
Example 2: An aluminum block with a mass of 5 kg is suspended by a spring balance. When it is placed in alcohol, the reading of the spring balance is 30 N. Find the buoyant force of alcohol on the aluminum block
2. Factors affecting the size of buoyancy:
Notice:
The volume of an object displaced by liquid refers to the volume of the object immersed in the liquid. Not necessarily equal to the volume of the object.
in conclusion:
1. The buoyancy force on an object immersed in a liquid is related to the volume of liquid displaced by the object;
2. The buoyancy force on an object immersed in a liquid has nothing to do with the depth of the object in the liquid.
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