"Why Airplanes Can Go to the Sky" Pressure and Buoyancy PPT Courseware 2

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"Why Airplanes Can Go to the Sky" Pressure and Buoyancy PPT Courseware 2

Exploration activity one: paper blowing experiment

When you blow air between the two papers, the two papers are not blown apart but move closer to each other. Why? Who pressed the two pieces of paper together?

Exploration Activity 2: Table Tennis Balls That Can’t Be Blown Down

When you blow air down through the funnel with your mouth, the ping pong ball does not fall under the funnel. Why? Who supports table tennis?

I know:

*When air is blown between two papers, the air flow velocity in the middle of the two papers becomes larger, and the pressure in the middle is smaller than the pressure on the outside of the two papers. The pressure difference between the outside and the middle of the two papers brings the two papers closer together.

*When air is blown downward through the funnel, the air flow speed above the table tennis ball becomes faster and the pressure becomes smaller, which is less than the air pressure below the table tennis ball. The pressure difference between the upper and lower sides prevents the table tennis ball from falling.

Explore the lift of an airplane

question:

1. Why do planes weighing dozens of tons fly into the sky?

2. How is lift generated?

The oncoming wind is divided into two parts by the wing. Since the cross-sectional shape of the wing is asymmetrical up and down, the airflow above the wing travels longer in the same time, so the speed is greater than the airflow below.

Conclusion: The airflow on the upper and lower surfaces of the wing produces a pressure difference due to different flow speeds, which is the upward lift force.

I will do it:

1. As shown in Figure 1, when two ships are very close and traveling side by side, they will _______. This is because the flow speed of the water inside the two ships is _____ than the flow speed of the water outside the two ships, causing the water flow inside the two ships to The reason why the pressure _____ is higher than the pressure of the water outside (optional "big", "small" or "equal").

2. Open the tap and let the tap water flow through the glass tube as shown in Figure 13-16. At A, B, and C, the water flow rate is higher at ____, and the pressure is at _____ ( Optional "A", "B" or "C").

3. As shown in Figure 3, it is a schematic diagram of the principle of a sprayer. When the air flows rapidly through the small hole, the flow rate of the air near the small hole is larger, the pressure _____ the air pressure above the liquid level in the container, and the liquid flows along the thin tube. After it rises and flows out of the nozzle, it is impacted by the air flow and sprayed into mist.

After-school development:

Use a thin wire to lift an empty plastic beverage bottle and make it rotate around the axis of symmetry. The rotating plastic bottle drives the surrounding air to rotate around it. If you use a fan to blow air to it at this time, due to the rotation of the bottle, the wind speed on both sides will be different. As shown in the figure, according to the relationship between the fluid flow rate and the pressure, determine which direction the rotating beverage bottle should move. Try to draw a movement diagram with a pen in the picture.

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"Why Airplanes Can Go to the Sky" Pressure and Buoyancy PPT Courseware 4:

"Why Airplanes Can Go to the Sky" Pressure and Buoyancy PPT Courseware 4 1. Fluid: a general term for liquids and gases. Question: What is the relationship between fluid pressure and flow rate? Guess it. Guess 1: If the flow rate is small, the pressure will be small; if the flow rate is high, the pressure will be strong. Conjecture 2: The flow rate is small and the pressure is strong...

"Why Airplanes Can Go to the Sky" Pressure and Buoyancy PPT Courseware 3:

"Why Airplanes Can Go to the Sky" Pressure and Buoyancy PPT Courseware 3 The relationship between gas pressure and flow velocity Blow air between two drooping papers: (1) Phenomenon (2) Compare the gas flow velocity inside and outside the two papers (3) Put forward your conjecture What is the relationship between the pressure of flowing air and the flow rate?

"Why Airplanes Can Go to the Sky" Pressure and Buoyancy PPT Courseware:

"Why Airplanes Can Go to the Sky" PPT Courseware on Pressure and Buoyancy 1. Fluids Both gases and liquids are fluid and are collectively called fluids. Liquid has pressure. There is pressure in all directions. Liquidity. Gas has pressure. 2. The relationship between fluid pressure and flow rate 1. Liquid pressure...

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Update Time: 2024-09-10

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