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Authoritative PPT Summary
"Archimedes' Principle" Buoyancy PPT Courseware 4
learning target
1. Through experiments, explore the factors related to the size of buoyancy;
2. Understand Archimedes' principle and be able to perform simple calculations using F float = G displacement.
Do these objects experience the same buoyant force? What factors are related to the buoyant force?
guess……
When a ship sails from a river to the sea, its draft changes
Put eggs into water, then add salt to change the density of the liquid. What will happen?
When lifting water from a well, the more the bucket is filled with water above the surface of the water, the greater the force required to lift the bucket. What are your guesses?
The amount of buoyancy may be related to the volume of liquid displaced or to the depth to which the object is immersed in the liquid.
Explore the factors that affect buoyancy
How will the reading of the spring force gauge change when the same object is immersed in different volumes of water?
Will the reading of the spring force gauge change when the same object is immersed in liquid at different depths?
Is it the same conclusion as yours?
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.
Explore the relationship between the buoyant force on an object immersed in water and the gravity of the liquid it displaces
in conclusion:
The buoyant force on an object immersed in a liquid is equal to the gravity of the liquid displaced by the object. This is the famous Archimedes' principle.
Formula: F float = G row = m row g = p liquid V row g
Note: Archimedes' principle applies not only to liquids but also to gases.
Class exercises
1. Wood blocks and iron blocks of the same volume are both immersed in water. The iron block will sink and the wood block will float. Therefore, the buoyancy force on the block is greater when submerged. ( )
2. A wooden block floating in alcohol displaces 30 grams of alcohol. If it floats in water, it can displace ( ) grams of water.
3. The wooden block at the bottom of the water will float up after you let go. Before it surfaces, the buoyancy force it receives ( ) (select "get bigger", "get smaller" or "unchanged").
4. A piece of wood with a volume of 100 cm3 has a volume of 40 cm3 above the water. Does the wood block experience buoyancy? If so, how big is the buoyancy?
(g=10 N/kg)
Solution: subject to buoyancy
According to Archimedes' principle, we can get
F float = G row = ρ liquid V row g
=ρwater (100 cm3-40 cm3) g
=1×103 kg/m3×6×10-5 m3×10 N/kg
=0.6 N.
Class summary
1. Buoyancy
Factors that determine the size of buoyancy: the density of the liquid and the volume of liquid displaced by the object
Measuring buoyancy by weighing method: Fbuoyancy=G-F′
2. Methods of exploring experiments: analogy method, control variable method
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