"Archimedes' Principle" Buoyancy PPT Courseware 8

Description

"Archimedes' Principle" Buoyancy PPT Courseware 8

1. Review

1: What is buoyancy?

Design experiment: As shown in the figure, use a spring dynamometer, a block, a thin wire, a beaker, water and other equipment to compare the readings of the spring dynamometer when the block is in air and water.

step:

(1) Determine the gravity of the object in air.

(2) Immerse the block in water and weigh its gravity.

think:

Are the gravity measured twice the same? Why?

2. 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 liquid displaced by the object

Conjecture 1: Buoyancy may be related to liquid density

design experiment:

⑴Put an object into clear water and observe the indication of the spring dynamometer G1=——

⑵Put the object into the copper sulfate solution and observe the indication of the spring dynamometer G2=——

Phenomenon: It is found that G2 is smaller than G1

Analysis: The density of copper sulfate solution is greater than that of water, so the buoyancy is greater

Experimental conclusion: The size of the buoyancy force is related to the density of the liquid.

Conjecture 2: The size of the buoyancy force may be related to the volume of liquid displaced by the object

design experiment:

Slowly press the can into the beaker filled with water by hand, experience the buoyancy and its changes, and observe the amount of water overflowing in the plate.

Phenomenon: The larger the volume of the can immersed in water, the more water will be discharged.

Analysis: The larger the volume of the object immersed in the liquid, the greater the volume of the displaced liquid, and the greater the buoyancy force on the object.

Experimental conclusion: The size of the buoyancy force is related to the volume of liquid displaced by the object.

Experimental exploration: the size of buoyancy

Ask the question: What is the relationship between the magnitude of the buoyant force and the force of gravity that displaces the liquid?

Experimental equipment: stones, overflow cup, small bucket, spring dynamometer, water

Experimental steps:

(1) Use a spring dynamometer to first measure the gravity G of the stone.

(2) Measure the reading F of the spring force gauge when the stone is immersed in the liquid.

(3) Calculate the buoyancy force Fbuoyancy=G-F=?

(4) Measure the gravity G1 of the empty keg

(5) Measure the total gravity G2 of the keg and the drained water

(6) Calculate the gravity of the displaced water G=G1-G2=?

Class exercises

1. In the debate between the big fish and the small fish as shown in the picture, the ____ fish’s statement is correct. This is because the two fish are immersed in the same liquid, and the buoyancy force they receive is related to __________.

2. A 2N object is hung on a spring dynamometer. When the hook code is immersed in water, the reading of the spring dynamometer is 1.2N. The buoyancy force of the hook code by the water is ________N

3. A wooden block floats on the water surface. It is known that its volume is 0.005m3, and two-fifths of it is above the water surface. Find the buoyant force on the wooden block?

(ρwater=1.0×103kg/m3, g=10N/kg)

summary

1. Factors affecting the size of buoyancy: The size of 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.

2. Archimedes' principle: The buoyancy force on an object immersed in a liquid is equal to the gravity of the liquid displaced by the object.

Formula: F float = G row = ρ liquid g V row

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Update Time: 2024-11-19

This template belongs to Physics courseware Lu Jiao Edition Eighth Grade Physics Volume 2 industry PPT template

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