"The Floating and Sinking Conditions and Applications of Objects" Buoyancy PPT Teaching Courseware

"The Floating and Sinking Conditions and Applications of Objects" Buoyancy PPT Teaching Courseware

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

Knowledge point 1 The floating and sinking conditions of objects

1. Conditions for the floating and sinking of objects: For an object immersed in a liquid, if F floats ____G objects, the object floats; if F floats ____G objects, the object sinks; if F floats ____G objects, the object can be suspended anywhere in the liquid.

2. Fill in the blanks and draw a force diagram based on the floating and sinking conditions of the object.

(1) Floating: F floating ____G objects, ρ liquid ____ρ objects, V discharge ____V objects.

(2) Floating (objects below the liquid surface): F floating ____G objects, ρ liquid ____ρ objects, V discharge ____V objects.

(3) Suspension: F floating ____G matter, ρ liquid ____ρ matter, V discharge ____V matter.

(4) Sinking (objects below the liquid surface): F floating ____G objects, ρ liquid ____ρ objects, V discharge ____V objects.

(5) Bottom: F floating ____G objects, ρ liquid ____ρ objects, V discharge ____V objects. (Please fill in ">", "<" or "=" for each of the above blanks)

3． During the May Day holiday, Xiao Ming and his family went to the "Dead Sea" outside the county. The so-called "Dead Sea" is actually a saltwater lake. When a person is immersed in water, the buoyant force on the person _____ the gravity on the person, so the person will naturally float upward; when the person floats on the water and is stationary, the buoyant force on the person ______ the gravity on the person .

4． When a solid iron ball with a mass of 50 g is placed in water, it will _____, because the buoyancy force on the iron ball _____ the gravity it receives; when the iron ball is put into mercury, the iron ball will eventually _____, because the iron ball's buoyancy force _____ Density_____The density of mercury.

5. Green peppers and tomatoes, both with a mass of 1 kg, float in the same basin of water. The relationship between the buoyancy forces they experience is ()

A. Green peppers are highly buoyant

B. Green peppers and tomatoes are equally buoyant

C. Tomatoes are highly buoyant

D. Insufficient conditions for comparison

6． Put a uniform solid object into a beaker filled with water. When the object is stationary, it is as shown in Figure 10-3-2. If the object is divided into two pieces of different sizes and still placed in a beaker filled with water, then ( )

A. Large pieces sink to the bottom of the cup and small pieces float on the surface

B. Big and small pieces all sink to the bottom of the cup

C. Big and small pieces are floating on the water

D. Large and small pieces are suspended in the water

7． Draw a diagram according to the requirements. Please draw a schematic diagram of the buoyancy force F and gravity G experienced by a block suspended in water in Figure 10-3-3.

Knowledge point 2 Application of floating and sinking conditions

8. The ship uses _____ method to increase the V row, thereby increasing the available _____; the size of the ship is represented by _______, which refers to the ______ of water displaced by the ship when it is filled with cargo according to the design requirements.

9. A ship with a displacement of 3000 t sails in a river. When fully loaded, the ship and its cargo weigh a total of ________N. The buoyancy force on the ship is ________N. (g is taken as 10 N/kg)

10． A submarine achieves diving and buoyancy by changing _________ by filling and draining the water tank. The buoyancy force it experiences when submerged is ______ (optional "change" or "unchanged").

11. The airbags of balloons and airships are filled with gases (such as hot air, hydrogen, helium, etc.) with density _____ air density, and use the _____ of air to lift off.

12. As shown in Figure 10-3-4, when using a density meter to measure the density of a liquid, the density of the density meter and the buoyancy force are ______. The greater the density of the liquid, the more ____ the volume of liquid it displaces. The position of the density meter The more ____ (optional "high" or "low").

PPT on the floating and sinking conditions of objects and their application, part two: comprehensive practice of regular methods

13. There is an egg floating on the water. If you add some salt to the water, when it is at rest, the buoyant force it will experience will be ()

A. Get bigger b. become smaller

C. unchanged D． Unable to judge

14. In a container filled with water, an object with a mass of 20 g is placed, and 15 g of water overflows from the container. The floating and sinking situation of the object in the water is ()

A. sink b. float up

C. Float D. levitate

15. As shown in Figure 10-3-5, the volumes of the hydrogen balloon and the air balloon are the same. The buoyancy force on the hydrogen balloon is F hydrogen, and the buoyancy force on the air ball is F air. The correct one of the following statements is ()

A. F hydrogen>F empty B. F hydrogen = F empty

C. F hydrogen

16． Five "water lines", also known as "load lines", are painted on the sides of ocean-going ships, as shown in Figure 10-3-6. The one marked with "W" is the North Atlantic load line, marked with "S" is the Indian Ocean load line. When the ship sails from the North Atlantic to the Indian Ocean, the relationship between the buoyancy force on the ship and the seawater density ρ1 of the North Atlantic and the seawater density ρ2 of the Indian Ocean is ( )

A. The buoyancy increases, ρ1=ρ2

B. The buoyancy force decreases, ρ1=ρ2

C. The buoyancy remains unchanged, ρ1>ρ2

D. The buoyancy remains unchanged, ρ1<ρ2

17. The instrument for measuring the density of liquid is called a density meter. Insert it into the liquid to be measured, and after it is still, read the scale value at the liquid level directly (as shown in Figure 10-3-7A). The beakers in Figures B and C contain the same homemade simple density meter. It is made by winding some copper wire on one end of a wooden rod. The beakers contain different liquids. The density meter stands vertically in the liquid. The phenomenon in the picture can be judged ( )

A. The density meter experiences greater buoyancy in the liquid in beaker B.

B. The density meter experiences greater buoyancy in the liquid in the beaker.

C. The density of the liquid in beaker B is greater

D. The liquid in the C beaker is denser

The floating and sinking conditions of objects and their application PPT, the third part: practical practice of high-frequency examination questions

20．2018·Kunming In order for the red-billed gulls that come to Kunming to spend the winter not to be hungry, they must be fed with gull food every year. In the past, part of the gull food that was put into the water quickly sank into the water because the seagulls could not eat it in time, which not only wasted food but also polluted the water body. In 2017, a manufacturer "expanded" gull grain so that it could float on the water for a long time after being put into water, and seagulls could almost eat it. Puffed gull grain can float on the water because of its ( )

A. The mass becomes larger B. Smaller size

C. The density becomes larger D. Density becomes smaller

21．2018·Silver As shown in Figure 10-3-10, the table tennis ball floats on the water. Please draw a schematic diagram of the gravity G and buoyancy force F on the table tennis ball.

Keywords: Free download of PPT courseware for eighth-grade physics volume 2 of the People's Education Press, PPT download of floating and sinking conditions and applications of objects, buoyancy PPT download, .PPT format;

For more information about the "Floating and Sinking Conditions and Applications of Buoyant Objects" PPT courseware, please click on the "Floating and Sinking Conditions and Applications of Buoyant PPT Objects" PPT tag.

"Conditions and Applications of Floating and Sinking Objects" Buoyancy PPT (Lesson 2):

"Floating and Sinking Conditions and Applications of Objects" Buoyancy PPT (Lesson 2) Part One: Basic Knowledge Points Knowledge Point 1 Ship 1. Ships use the hollow method to increase the available buoyancy, which is the application of floating conditions. The displacement of a ship is 1103 t. Then this ship...

"Conditions and Applications of Floating and Sinking Objects" Buoyancy PPT (Lesson 1):

"Conditions and Applications of Floating and Sinking of Objects" Buoyancy PPT (Lesson 1) Part One: Knowledge Points Basic Knowledge Point 1 The relationship between the floating and sinking of objects and buoyancy 1. A 50 kg man lies on the Dead Sea and reads a book. The buoyant force he experiences is 500 N (g is taken as 10 N/kg). 2..

Download "Floating and Sinking Conditions and Applications of Objects" Buoyancy PPT:

"The Floating and Sinking Conditions and Applications of Objects" Buoyancy PPT Download Part One Content: Preview Perception 1. The Floating and Sinking Conditions of Objects Floating and sinking types F float and G Relationship between liquid and object Floating (as shown in Figure A) F floating G Liquid sinking (as shown in Figure A) B) F float G liquid suspension (as shown in Figure C) F..