"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 3

Description

"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 3

learning target:

1. Understand the relationship between fluid pressure and flow rate;

2. Understand how the lift of an airplane is generated;

3. Through observation, understand the phenomenon related to fluid pressure and flow rate; experience the force generated by the gas pressure difference.

1. Fluid

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

2. Fluid pressure: The pressure generated when a fluid flows is called fluid pressure.

2. Explore: the relationship between gas pressure and flow rate

Hold two pieces of paper in your hands and let them hang down naturally and parallel to each other. What phenomena can be observed when air is blown downward between two pieces of paper?

The paper moves closer to the center.

This shows what?

The greater the flow rate of the gas, the smaller the pressure.

Conclusion: In a gas, where the flow velocity is greater, the pressure is smaller.

Practical exercise 1

Leaves fall on the road. When a high-speed car drives over the road, the leaves will ( )

A. Flying from the middle of the road to the side of the road B. only upwards

C. Being sucked toward the car from the roadside D. not affected

Practical exercise 2

Have you ever had this experience: walking in the rain with an umbrella, and a strong wind blows, and 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 velocity above the umbrella is greater than below

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

D. The air velocity above the umbrella is slower than below

Practical exercise 3

3. When the range hood is working, due to the high flow rate and pressure of the gas at the rotating fan blades, the oil smoke is forced to the fan opening under the action of the surrounding atmospheric pressure.

Lay a solid foundation

1. The pressure of fluid is _____ where the flow velocity is high, and the pressure is _____ where the flow velocity is low.

2. If ships sailing at high speed get too close, the flow speed on the inside of the two ships _____ the flow speed on the outside, so the pressure on the inside _____ the pressure on the outside. Under the action of _____ force on the hulls, a collision accident will occur (optional) Fill in "greater than", "less than", "balanced" or "unbalanced").

3. The wings of the aircraft are made to be convex at the top and flat at the bottom. When flying, the airflow speed above the wing _____ the airflow speed below the wing. The air pressure above the wing _____ the air pressure below. The resulting upper and lower pressure difference is what the aircraft obtains. ____force.

Summary

1. Fluid

2. Fluid pressure rules

3. Reasons why the fluid flow rate becomes faster:

(1) Caused by external force, such as blowing air.

(2) Driven by external force. Such as the safety line of a train.

(3) A certain fluid has a high flow velocity in a location with a long distance in the same time, such as an airplane wing.

(4) A certain fluid has a high flow velocity through a location with a small cross-sectional area in the same time. For example, ships cannot sail side by side.

4. Methods of analyzing fluid phenomena: first clarify the flow velocity relationship, then analyze the pressure relationship, and finally derive the possible phenomena.

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"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 8 Learning Objectives 1. Understand the relationship between fluid pressure and flow velocity, and know how the lift of an aircraft is generated 2. Explore the relationship between fluid pressure and flow velocity through experiments, and cultivate students' preliminary analysis and summary Ability 3. Utilize...

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Update Time: 2024-06-23

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

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