"Archimedes' Principle" Buoyancy PPT Download

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"Archimedes' Principle" Buoyancy PPT Download

Part One: Preview Perception

1. Archimedes’ inspiration

1. The volume of an object immersed in a liquid is equal to the volume of the liquid displaced by the object in the liquid.

2. The size of the buoyancy force is related to the gravity of the object displacing the liquid.

2. Archimedes’ Principle

1. Content: An object immersed in a liquid experiences an upward buoyant force equal to the gravity of the liquid it displaces.

2. Formula: F float = G row.

3. Scope of application: suitable for liquids and gases.

Archimedes Principle PPT, Part 2: Interactive Classroom Understanding

Correctly understand Archimedes' principle

(1) The "object immersed in the liquid" mentioned in the principle includes two situations: "full immersion" and "partial immersion": first, the entire volume of the object is immersed in the liquid, that is, the object is immersed in the liquid; second, Part of the object is immersed in the liquid and the other part is exposed above the liquid surface.

(2) Formula: F float = G row = ρ liquid gV row.

(3) G row refers to the gravity of the liquid displaced by the object. F float = G row means that the buoyancy force on the object is equal to the gravity of the liquid displaced by the object.

(4) V row is the volume of liquid displaced by the object, not the volume of the object. Only when the object is immersed in the liquid, V row = V object; when only part of the object is immersed in the liquid, V row < V object .

(5) From F float = ρ liquid gV displacement, it can be seen that the size of the buoyancy force is only related to the density of the liquid and the volume of the liquid displaced by the object, and is related to the volume, density, shape, and position of the object in the liquid. It has nothing to do with factors such as the depth and whether it moves in the liquid.

(6) Archimedes’ principle also applies to gases, but the ρ liquid in the formula should be changed to ρ gas.

[Example] During the Antarctic scientific expedition, the Chinese scientific expedition team discovered a new meteorite distribution area in the Grove Mountains area of ​​Antarctica and found thousands of meteorites. The scientific expedition team members measured the density of the meteorite numbered "cz20100603": first, the meteorite was suspended under a spring dynamometer, and the reading of the spring dynamometer was 3.4 N; then the meteorite was immersed in water, and the spring dynamometer was read. The force gauge indicates 2.4 N. What is the density of the meteorite? (g is taken as 10 N/kg)

Tips: To determine the density of a meteorite, you must first find the mass and volume of the meteorite. The mass of the meteorite can be calculated from its gravity, and its volume can be calculated using the knowledge of buoyancy. Comprehensive use of F float = G-F and F float = G row = ρ liquid gV row is the key to solving this type of problem.

Archimedes Principle PPT, Part 3: Try Application

1. Explore the relationship between the buoyancy force and the gravity of the displaced liquid.

1. A student used a spring dynamometer, a measuring cylinder, water and stones to conduct an experiment to explore the relationship between buoyancy and the gravity of the liquid displaced by the object. Several scenarios in the experiment are as shown in the figure. From this it can be concluded:

(1) The buoyant force on the stone is ________N.

(2) The gravity of the water displaced by the stone is ________N.

(3) Conclusions that can be drawn from this research experiment: _____ (g is 10 N/kg).

2. Archimedes’ Principle

2. As shown in the picture, slowly press down the wooden block floating on the water. When the wooden block is completely immersed in the water, continue to press downward for a certain distance. During the whole process, the buoyancy force on the wooden block is ()

A. First become larger and then become smaller B. First become larger and then remain unchanged

C. No change at first and then get bigger D. Get smaller first and then get bigger

3. Place an object with a mass of 0.5 kg gently into an overflow cup filled with water. If 0.2 kg of water overflows, the buoyant force on the object is (g is 10 N/kg) ()

A.5 N B.0.5 N

C.2 N D.0.2 N

4. As shown in the picture is a water bicycle made by a classmate. She installed 8 airtight empty water buckets (each bucket has a volume of 0.02 m3) on an ordinary bicycle, and installed several plastic pieces on the rear wheel. When the student is riding a bicycle on the water at a constant speed, on average, about one-half of the volume of each bucket is immersed in the water, excluding the volume of water displaced by the wheels and plastic sheets. At this time, the buoyancy force on the water bicycle is about ______N. (g is taken as 10 N/kg)

5. There is a solid iron block with a volume of 1×10-4 m3, which is hung under a spring dynamometer and then immersed in water (the iron block does not touch the bottom of the container). The density of iron is 7.8×103 kg/m3, and g is 9.8 N/kg, find:

(1) The gravity of the iron block.

(2) The buoyancy force on the iron block.

(3) The indication of the spring dynamometer.

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For more information about the PPT courseware "Archimedes' Principle of Buoyancy", please click the Buoyancy ppt Archimedes Principle ppt tag.

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"Archimedes' Principle" Buoyancy PPT Part One Content: Learning Objectives Navigation Learning Objectives 1. Understand Archimedes' Principle. 2. Be able to use Archimedes' principle to calculate the buoyancy force on an object. Learning points: 1. Explore what factors are related to the size of the buoyancy force. 2.will...

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Update Time: 2024-10-05

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

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