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

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

1. Fluid

Both gases and liquids are fluid and are collectively called fluids.

Liquids have pressure. There is pressure in all directions. Liquidity.

Gas has pressure

2. The relationship between fluid pressure and flow rate

1. The relationship between liquid pressure and flow rate

Analyze experimental phenomena

The same volume of liquid flows through different sections of the tube per second.

The flow velocity is small where the cross-sectional area is large, and the flow velocity is high where the cross-sectional area is small.

experiment analysis

When water flows, the thickness of the horizontal tubes is different, but the flow rate is the same. Therefore, the flow rate of water in the three horizontal tubes is different. The water velocity in the thick tube is small, and the water velocity in the thin tube is large. When water flows, the heights of water columns in small vertical pipes are different. According to the liquid pressure formula P = ρgh, that is to say, the pressure of water in each horizontal pipe is different. The pressure of water in thick pipes is strong, and the pressure of water in thin pipes is different. The pressure is low.

Experimental results

In a liquid, the pressure is smaller where the flow velocity is greater, and the pressure is greater where the flow velocity is smaller.

2. The relationship between gas pressure and flow rate

Observe and think

Do the following three experiments: blow hard and guess how coins, paper strips, and ping pong balls will move? Let’s give it a try, classmates.

think

In the above experiment, the coin "jumped" upward, the paper "floated" upward, and the ping-pong ball did not fall. During these processes, only air came into contact with it. Is it because the pressure above and below them is different? Are they moving upward? Next we continue to observe and experiment.

Experimental results

Through the above experiments, it can be seen that in gas, the pressure is smaller where the flow velocity is greater.

Summarize

In fluids, where the flow velocity is greater, the pressure is smaller, and where the flow velocity is smaller, the pressure is greater.

think about it

Use the relationship between gas pressure and flow velocity to explain experimental phenomena:

① When blowing, how does the gas flow through the object?

② What are the characteristics of the gas pressure around the object?

Class exercises

1. If the pressure is greater where the flow velocity is greater in gases and liquids, the situation that will not occur is ( ).

A. The cross-sectional shape of an airplane wing should be reversed

B． Two ships traveling side by side in the same direction will not collide

C. There is no need to set up safety lines on subway and train station platforms

D． No matter how hard you blow with the sprayer, you can't spray mist.

2. There is a safety line drawn on train stations and subway platforms. When the train passes quickly, people who cross this line will be in danger. This is because when the train is moving, the gas near the train is ________ and the pressure is ________, and the gas far away from the platform is ________ and the pressure is ________, and the strong air flow will __________.

3． Du Fu, a famous poet of the Tang Dynasty, wrote in "Song of Thatched House Broken by the Autumn Wind": "The high autumn wind roared in August and rolled up the three layers of thatch on my house." It said that the strong wind blew away the roof of the thatched house. Can you explain why the strong wind blew away the roof? Can the roof be lifted off?

Summary of this lesson

1. Fluid: Both gases and liquids are fluid and are collectively called fluids;

2. The relationship between fluid pressure and flow velocity: the pressure is small where the flow velocity is high, and the pressure is strong where the flow velocity is low;

3． Aircraft lift: The pressure difference between the upper and lower surfaces of the wing is the cause of lift;

4. hydrofoil

5. The relationship between fluid pressure and flow velocity.

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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 2:

"Why Planes Can Go to the Sky" Pressure and Buoyancy PPT Courseware 2 Exploration Activity 1: Paper Blowing Experiment When you blow air between two pieces of paper, the two pieces of paper are not blown apart but move closer to each other. Why? Who pressed the two pieces of paper together? Exploration Activity 2: What cannot be blown down...

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Update Time: 2024-11-23

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume 2 industry PPT template

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