"Relationship between Fluid Pressure and Flow Velocity" Pressure PPT download

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"Relationship between Fluid Pressure and Flow Velocity" Pressure PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The relationship between fluid pressure and flow rate

1. A certain city was hit by a heavy rainstorm. Severe waterlogging turned the city into a "water city". The phenomenon as shown in the picture appeared in many places. When people or objects approach the vortex, they may be "sucked" into the center of the vortex and flow into it. Sewers are very dangerous because where the fluid flow rate is high, the pressure is low.

2. As shown in the figure, A and B are the two openings at the upper end of the U-shaped container. There is an appropriate amount of water in the container. When a pipe is used to blow air quickly along the B opening, the water surface at the A opening will drop (select Fill in "rising", "falling" or "unchanged").

3. Hefei Metro Line 1 and Line 2 have been officially put into operation. In order to avoid accidents in which waiting passengers are "sucked" towards the train, protective walls are installed in the waiting area on the platform. This is because the car body of the train enters the station. Nearby(A)

A. The air flow speed increases and the pressure decreases

B. The air flow speed increases and the pressure increases

C. The air flow speed becomes smaller and the pressure becomes larger.

D. The air flow speed becomes smaller and the pressure becomes smaller.

4. As shown in the picture, Xiao Liang holds the funnel in his hand with the bell mouth facing downwards, holds the ping pong ball with the other hand, and lets the ball face the thin tube in the funnel. When he aims at the mouth of the funnel When blowing downward forcefully, I found that the table tennis ball did not fall after I let go. The correct analysis of the reason why the table tennis ball did not fall is (C)

A. When blowing, strong static electricity is generated to attract the table tennis ball.

B. Blowing air increases the buoyancy of the air on the table tennis ball.

C. The pressure of the gas above the ping pong ball is smaller than the pressure of the gas below the ping pong ball.

D. The pressure of the gas above the ping pong ball is greater than the pressure of the gas below the ping pong ball.

Knowledge point 2: The lift of the aircraft

5. The world's largest solar-powered aircraft has flown around the world. The aircraft can take off because the airflow speed passing through the lower surface of the wing is less than (optional "greater than" or "less than") the airflow speed passing through the upper surface of the wing.

6. When the helicopter rises vertically, the force that makes the helicopter rise is (C)

A. The force exerted by the helicopter on the propeller

B. The force of the propeller on the air

C. The force of air on the propeller

D. The force exerted by the propeller on the helicopter

PPT on the relationship between fluid pressure and flow rate, part 2: improvement of comprehensive capabilities

7. Have you ever seen this kind of rotating stone ball? When water is sprayed, the huge stone ball in the center of the "spring" can keep rolling. What's going on? If you observe carefully, you will find that the water flow speed and size of the water flow on both sides of the stone ball are different. The flow speed of the water on the left side is smaller than the flow speed of the water on the right side, so the pressure on the left side is greater than (optional " Greater than, "less than," or "equal to") The pressure of the water on the right side enables the stone ball to rotate continuously.

8. As shown in the picture, put a basin under the faucet, put a table tennis ball in the basin, turn on the faucet, and the water rushes down towards the table tennis ball, then the table tennis ball will not move (choose "yes" or "no") Being washed away by the water and leaving the bottom of the water column.

9. As shown in Figure A, when air is blown into the middle of the two papers, the paper will move closer to the middle. According to this rule, the device shown in Figure B can be made. When air is blown forcefully into the plastic tube B, the thin tube The liquid level in A will rise (select "rising", "falling" or "no movement").

10. A physics extracurricular group made an experimental device as shown in the picture. Open valve A and water flows into the pipe. When the water is stable, the liquid level in pipe a is equal to the liquid level in pipe b. Then open valve B and the water flows out. During the process, the liquid level height of pipe a is greater than (please fill in "greater than", "less than" or "equal to") the liquid level height of pipe b.

11. Which of the following cannot be explained by the "relationship between fluid pressure and flow velocity" (C)

A. The "loop ball" pulled by table tennis players

B. The "eagle" gliding in the air

C. The "hot air balloon" taking off

D. "Tornado" blowing on the ground

12. In windy weather, if we ride a bicycle against the wind and a strong wind blows, it will be difficult to inhale through the mouth or nose, but we can exhale outward; when the strong wind passes, we can resume normal breathing. The reason for the above phenomenon is (D)

A. It has nothing to do with air pressure, it has to do with people’s lack of exercise

B. When the wind is strong, the pressure inside the human body increases, making it difficult for people to inhale.

C. When the wind is strong, the air pressure in front of the face increases, making it difficult for people to breathe.

D. When the wind is strong, the air pressure in front of the face becomes smaller, so it is easier to exhale outwards

PPT on the relationship between fluid pressure and flow rate, part 3: Expansion of research and breakthroughs

17. At the same height near the ground or when the height difference is not significant, the relationship between air flow velocity v and pressure p can be expressed as 1/2ρ0v2+p=C (where C is a constant and ρ0 represents the air density). Place a coin of mass m on a horizontal table, and blow air in the direction shown by the arrow. The airflow passes through the upper part of the coin. Since there is no airflow passing under the coin, a pressure difference is generated, giving the coin an upward force.

(1) When the coin is blown up, the pressure difference between the upper and lower surfaces of the coin ΔF=mg;

(2) If the coin happens to be blown up when the air velocity above is v0, please write the expression for the surface area S of the coin: S= 2mg/(ρ_0 v_0^2) (expressed by ρ0, v0, m, g) .

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Update Time: 2024-11-11

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