"Archimedes' Principle" Buoyancy PPT Courseware 2

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"Archimedes' Principle" Buoyancy PPT Courseware 2

Archimedes' inspiration

More than two thousand years ago, the Greek scholar Archimedes wanted to measure the volume of a gold crown in order to determine whether it was pure gold. He thought hard for a long time but came up with no result. One day, when he stepped into a bathtub full of water to take a bath, he saw the water in the bathtub overflowing. He suddenly thought: Isn't the volume of an object immersed in liquid the same as the volume of liquid displaced by the object?

Think about it

Press the can into a beaker filled with water and feel the relationship between buoyancy and the displaced liquid.

Review: What factors are related to buoyancy?

The amount of buoyancy is related to the volume it is immersed in the liquid and the density of the liquid. The greater the volume immersed in the liquid and the greater the density of the liquid, the greater the buoyancy force.

1. Archimedes’ Principle

1. Content: The buoyant force on an object immersed in a liquid is equal to the weight of the liquid it displaces.

2. Mathematical expression: F float = G row

3． Derived formula for calculation: F float = G row = m row g = r liquid gV row

4． Scope of application: liquids and gases

2. Discussion on Archimedes’ Principle

1. Distinguish between: immersion, immersion, immersion, immersion;

2. F float = r liquid gV discharge r liquid - the density of the liquid;

V row - the volume of liquid displaced by the object;

3. F float = r liquid gV discharge — Determining formula

It shows that the size of buoyancy is only related to r liquid and V row.

The size of the buoyancy force has nothing to do with factors such as the shape and density of the object, the depth of immersion in the liquid, and whether the object moves in the liquid.

3. Analysis of examples

Example 1: The buoyancy force experienced by an object immersed in a liquid depends on ().

A. Volume of object and density of liquid

B. Density of the object and depth of the object immersed in the liquid

C. The volume of the object immersed in the liquid and the density of the liquid

D. Factors such as the mass, volume, depth and shape of the object immersed in the liquid

Example 2 An object with a volume of 300 cm3 floats on the water, and 2/3 of its volume is exposed out of the water. What is the buoyancy force it experiences___N. (g is taken as 10 N/kg)

【Analysis】

According to Archimedes' principle:

F float = G discharge = ρ liquid gV discharge

According to the meaning of the question, row V=V/3

F float = ρ liquid gV discharge = 1.0×103 kg/m3×10 N/kg×10-4 m3=1 N

Summary of this lesson

1. Archimedes' Principle Exploration Experiment

2. Mathematical expression of Archimedes' principle

3． Discussion on the formula of Archimedes' principle

4． Analysis and calculation using Archimedes' principle

Operation

1. The volume of the iron block is 100 cm3. When the iron block is completely immersed in water, the volume of water displaced is ____cm3, the weight of the water displaced is ____N, and the buoyancy force it receives is ____N. If it were completely immersed in alcohol, the buoyant force would be ____N. (g is taken as 10 N/kg)

2. When an object is hung under the spring dynamometer and immersed in water, the reading of the spring dynamometer is 1/3 of the reading of the spring dynamometer when the object is in the air. The density of this object is ( )

A. 1/3×103 kg/m3 B. 2/3×103 kg/m3

C. 3×103 kg/m3 D. 3/2×103 kg/m3

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Update Time: 2024-11-22

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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