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Authoritative PPT Summary
"Buoyancy" PPT courseware 7
buoyancy
1. All objects immersed in liquid experience an upward buoyant force.
2. Direction of buoyancy: vertically upward
3. The size of buoyancy: F float = G-F pull’
(G is equal to the pulling force of the object in the air)
practise
1. A metal block is hung on a spring dynamometer. When it is in the air, it reads 27N. When it is immersed in water, it reads 17N. What is the buoyant force it receives?
Solution: F float = G-F pull = 27N-17N = 10N
Answer: The buoyancy force it experiences is 10N
Please use your brain and think about it
1. How will you measure the buoyancy force on an object during the experiment?
2. How would you measure the gravity of liquid displaced by an object?
3. What data need to be recorded during the experiment? How to design an experimental form?
Please give it a try
1. An object is completely immersed in water. The gravity of displacing water is 20N. What is the buoyant force on this object?
Solution: F float = G row = 20N
Answer: The buoyant force on this object is 20N
An object is completely immersed in water. The mass of the water displaced is 2kg. What is the buoyant force on the object?
Solution: F float = G row = m row g
=2Kg×9.8N/Kg=19.6N
Answer: The buoyant force on this object is 19.6N
summary:
1. All objects immersed in liquid experience an upward buoyant force.
2. Direction of buoyancy: vertically upward
3. The size of buoyancy: F float = G-F pull
4. Archimedes’ principle
(1) Content:
(2) Formula: F float = G row = m row g = ρ liquid gV row
test you
1. Hold a wooden block and a stone in each hand, immerse them both in the water, and release your hands at the same time. The small wooden block floats up, the big stone sinks, and _________ receives buoyancy.
2. A student gently placed a metal block with a mass of 300g into a container filled with water, and 80g of water overflowed. The buoyancy force of the water on the metal block is _____N.
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