"Archimedes' Principle" Buoyancy PPT courseware download

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"Archimedes' Principle" Buoyancy PPT courseware download

The first part of the content: Practice on classification of knowledge points

Knowledge Point 1 Archimedes’ Principle

1. In an experiment to "explore what factors may be related to buoyancy," a student filled a bucket with water and then pressed an empty beverage can into the water. The deeper an empty beverage can is pressed before being immersed, the buoyant force it receives will be _____, and the water that will overflow will be _____; this experimental phenomenon enlightens us: the size of the buoyant force may be related to the object _____________. In order to verify this conjecture, we can design experiments to measure the _____ and ____________ received by the object for comparison.

2. When a classmate was exploring "the relationship between the size of the buoyancy force and the gravity of the displaced liquid", a student conducted an experiment as shown in Figure 10-2-1. Complete the following exploration process as required:

(1) The gravity of the stone G=___N.

(2) After the stone is immersed in water, the indication of the dynamometer is G′ = _____N. From this, we can get the buoyancy force F float = _____N on the stone.

(3) The gravity force exerted on the water displaced by the stone is G=_____N.

(4) Comparing the sizes of F float and G row, we can find: F float ____G row.

(5) From the above experiment, it can be concluded that an object immersed in a liquid experiences an upward buoyant force, and the magnitude of the buoyant force is equal to the ______ it receives when it displaces the liquid. This is the famous _________ principle, expressed as _________.

3. To understand Archimedes' principle, which of the following statements is correct ( )

A． The buoyancy force experienced by an object immersed in a liquid is related to the volume of the object

B． The greater the depth of an object immersed in a liquid, the greater the buoyant force it will experience.

C. Archimedes' principle also applies to gases

D． The buoyancy force on an object immersed in a liquid is related to the shape of the object

Knowledge point 2 Calculation of buoyancy

4． In the story "Archimedes Solve the Mystery of the Crown", if the crown weighs 5 N when weighed in air and 4.7 N when weighed immersed in water, then the buoyant force on the crown when immersed in water is ______N , the water it displaces weighs _____N.

5. When a rock weighing 10 N is immersed in water, the mass of the water displaced is 400 g, the gravity of the water displaced by it is ___N, and the buoyancy force it experiences is ___N. (g is taken as 10 N/kg)

6. An aluminum block with a volume of 2 dm3 and a density of 2.7×103 kg/m3 is half immersed in water. The buoyant force on the aluminum block is ____N. (g is taken as 10 N/kg)

7. The mass of an iron block is 158 g. Question: (ρiron=7.9×103 kg/m3, g is 10 N/kg)

(1) What is the volume of the iron block?

(2) When the iron block is immersed in water, what is the buoyant force on the iron block?

Archimedes Principle PPT, Part 2: Comprehensive practice of regular methods

8. As shown in Figure 10-2-2, the bubbles spit out by the little goldfish in the fish tank gradually increase in volume as they rise in the water. The changes in the pressure and buoyancy of the bubbles are ()

A． The pressure becomes smaller, the buoyancy becomes smaller

B． The pressure becomes smaller and the buoyancy becomes larger

C. As the pressure increases, the buoyancy remains unchanged

D． Pressure remains unchanged, buoyancy remains unchanged

9. A, B, C, and D are four small balls with the same volume and shape but different materials. The situation after they are put into water and stand still is as shown in Figure 10-2-3. The one with the smallest buoyancy force among them is ( )

A． A B. Second

C. C D. Man

10． As shown in Figure 10-2-4, the cone is immersed in water. When the cone tip points up and down, the buoyancy force exerted on the cone ( )

A． Larger when the tip of the cone points upward

B． Larger when the tip of the cone is pointed downwards

C. same size

D． are the same size and equal to zero

11． When solid copper balls, iron balls, and aluminum balls with equal gravity (ρ copper > ρ iron > ρ aluminum) are immersed in water, the buoyant force they experience will be ( )

A． equal b. The copper ball is the largest

C. The aluminum ball is the largest D. The biggest iron ball

12. The mass ratio of objects A and B is 5:3, and the density ratio is 10:3. If they are both immersed in the same liquid, the ratio of the buoyant forces they receive is ()

A． 5:3 B． 10:3

C. 2:1 D. 1:2

13. As shown in Figure 10-2-5, an iron block weighing 10 N is tied with a light thin wire and immersed in water. When the iron block is at rest, the gravity of the water displaced by the iron block is 6 N. The buoyant force on the iron block is ____N , the pulling force of the thin wire on the iron block is ____N.

Archimedes Principle PPT, Part 3: Practical practice of high-frequency examination questions

17．2018·Yangzhou As shown in Figure 10-2-7, in order to verify Archimedes' principle, Xiao Ming put more than half of the bag of water in a plastic bag (the plastic bag is very light and thin) and measured it with a spring dynamometer. The amount of gravity exerted on a plastic bag containing water. Then slowly immerse the plastic bag in the water and observe that the dynamometer reading changes to ____, indicating that the greater the displacement of the plastic bag filled with water, the greater the buoyancy force it receives. Continue to slowly immerse the plastic bag in the water. When the __________________ phenomenon is observed, the spring force gauge reads zero, thus verifying Archimedes' principle. Xiaohua was going to fill the plastic bag with water to do the same experiment. During the operation, he found that the spring force gauge reading was zero before the plastic bag was completely immersed in the water. This was due to _______________.

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Update Time: 2024-11-19

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