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"Buoyancy" Buoyancy PPT download
Part One Content: Basic Knowledge Key Points
Knowledge point 1 Buoyancy
1. A duck floating in the water receives a "vertical upward" buoyancy force. The object exerting this force is water.
2. As shown in the figure, the pressure of the liquid in all directions on the side of the cylinder is balanced with each other. The upward pressure of the liquid on the lower surface is greater than the downward pressure of the liquid on the upper surface. This is why objects immersed in the liquid are buoyant. .
3. In the following scenario, the object that is not subject to buoyancy is (C)
A. "Liaoning" sailing at sea
B. The "Jiaolong" diving in the sea
C. "Tiangong-1" that travels in space
D. Hot air balloon rising in the sky
4. Regarding the buoyancy force on an object, which of the following statements is correct (D)
A. Objects in the air are not affected by buoyancy
B. The iron ball sinking at the bottom of the water is not affected by buoyancy.
C. The buoyant force on an object is generated by water
D. Buoyancy is the pressure difference between a liquid or gas on the upper and lower surfaces of an object
Knowledge point 2: Factors that determine the size of buoyancy
6. When Xiao Ming was exploring "factors affecting buoyancy", he did the experiment as shown in the picture. Please answer the questions based on his experimental investigation:
(1) The gravity of the cuboid block is 4 N, and the buoyancy force in Figure c is 1 N;
(2) Comparing Figures b and c, it shows that the buoyancy force exerted on an object is related to the volume of liquid displaced by the object. The greater the volume of liquid displaced by the object, the greater the buoyant force the object experiences;
(3) Comparing Figures c and d, it shows that the buoyancy force experienced by an object after being submerged has nothing to do with the depth of the object;
(4) It can be seen from Figures d and e that the buoyancy force experienced by an object when immersed in a liquid is related to the density of the liquid (optional "relevant" or "irrelevant").
7. When a nuclear submarine is submerged in water, the buoyancy force it experiences will be (C) the further it dives.
A. Become bigger B. Become smaller
C. Unchanged D. Unable to determine
Buoyancy PPT, Part 2: Comprehensive Ability Improvement
8. A ship made of steel can float on the water because of the buoyancy force; if you put a piece of steel into the sea, it will sink. Is this piece of steel (optional "yes" or "no") affected by the buoyancy force? .
9. As shown in the figure, a wooden block weighing 10 N floats on the water. The upward pressure exerted on the wooden block by the water is 10 N, and the buoyancy force on the wooden block is 10 N.
10. As shown in the picture, take a Sprite bottle whose inner diameter is slightly smaller than the diameter of a table tennis ball, remove the bottom, place a table tennis ball at the mouth of the bottle, and then fill the bottle with water. You will find that water flows out of the mouth of the bottle, and the table tennis ball Not floating. If you block the mouth of the bottle with your fingers, you will soon see the table tennis ball floating up. This experiment illustrates the cause of buoyancy.
11. In the experiment of "exploring what factors are related to the buoyancy force" as shown in the picture, you can explore the relationship between the buoyancy force exerted by the object and the volume of liquid displaced by the object (A) in the picture
A.A and C B.A and B C.B and D D.C and D
12. After initially understanding buoyancy, Xiaogang gently put the egg into the water. The egg sank to the bottom of the cup. Then he tried adding salt to the cup and found that the egg would gradually float up. In response to this phenomenon, the students in the group raised the following scientific questions, among which the most valuable and easy-to-explore question is (D)
A. How does the buoyancy force on the egg change?
B. What is the relationship between the buoyancy force and gravity of a floating object?
C. What factors are related to the buoyancy force exerted on an object?
D. What is the relationship between the buoyancy force on an object and the density of the liquid?
13. There is water in the container as shown in the figure. The one that is not subject to buoyancy is (C)
A.Object A B.Object B
Part C.C Part D.D
14. As shown in the figure, Q is a copper part, the upper part is a cube with side length L=0.2 m, and the lower part is a cube with side length l=0.1 m. The lower surface of Q is bonded to the bottom of the container, and the water surface is exactly level with the upper surface of Q, then the buoyancy force on the part is (g is 10 N/kg) (C)
A.0 N B.20 N
C.60 N D.80 N
Buoyancy PPT, the third part: expansion, exploration and breakthrough
16. When studying the causes of buoyancy, Teacher Zhang conducted the following experiment: As shown in the figure, containers A and B form a connector. There is a square hole with an area of 80 cm2 in the middle of the bottom of container B. The density is 0.6 g/cm3, a cube wooden block with a side length of 10 cm is placed in container B, and the square hole at the bottom of the container is covered. Then 15 cm deep water is slowly poured into container B. It is found that the wooden block does not float and rests at B. Bottom of the container (g=10 N/kg).
(1) Find the magnitude and direction of the pressure of the water in container B on the wood block;
(2) In order for the buoyancy force on the wooden block to be equal to its gravity, how deep must the water in container A be from the bottom of container B?
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