"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 4

Description

"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 4

Activity 1

Place an aluminum coin 2-3cm away from the edge of the table. Use a ruler or pen about 1-2cm high to set up a railing about 10cm in front of the coin, and blow hard on the coin in a direction parallel to the table. Take a breath and see what happens?

Will the coin jump?

discuss

Guess: What is the relationship between gas pressure and flow rate?

Activity 2

As shown in the picture, if you blow on two pieces of paper held parallel to each other, what do you guess will happen? And then do it. Is it the same as your guess?

The relationship between gas pressure and flow rate

Demo:

As shown in the figure, a U-shaped tube contains a certain amount of water, and one end of it is connected to a three-way glass tube. When air is blown from one end of the glass tube, observe what happens. What does this phenomenon indicate?

Summary of this lesson

1. In gases and liquids, the location where the flow velocity is greater.

2. When the aircraft moves forward, for the wing, the air flow speed above the wing is,

pressure , while the air velocity and pressure below are

This creates pressure and creates upward lift.

1. After the rapid increase in railway speed in my country, the air flow speed and pressure between passengers on the platform and the train have also changed. In order to effectively prevent safety accidents, the safety line distance on the platform has been changed from 1m to 2m. Regarding the changes in air flow speed and pressure between the train and passengers, the correct judgment is ( )

A. The air velocity 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.

2. Xiao Ming puts a ping pong ball in the inverted funnel and holds the ping pong ball with his fingers. Then blow forcefully downward from the mouth of the funnel and remove your fingers, as shown in the picture, then the table tennis ball will ( )

A. It will not fall because the gas flow velocity and pressure above it increase.

B. It will not fall because the gas flow velocity above it increases and the pressure becomes smaller.

C. will fall because the gas flow velocity above it increases and the pressure increases.

D. will fall because the gas flow velocity above it increases and the pressure becomes smaller.

3. Have you ever had this experience: walking in the rain with an umbrella, as shown in the picture, when a strong wind blows, the umbrella surface may be "sucked" and severely deformed. Regarding this phenomenon and its explanation, which one of the following is correct ( )

A. The umbrella surface is "sucked" downwards

B. The air flow velocity above the umbrella is greater than below it

C. The air velocity above the umbrella is equal to that below

D. The air flow velocity above the umbrella is smaller than below

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Update Time: 2024-09-03

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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