"Magical Lift" Buoyancy and Lift PPT Courseware

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"Magical Lift" Buoyancy and Lift PPT Courseware

1. Fluid and flow rate

Fluid: An object with fluidity is called a fluid, such as water and air.

When a fluid flows, what characteristics will appear in places with different flow rates?

A. Stubborn piece of paper

Blow air between two hanging pieces of paper:

(1) Put forward your conjecture

Before blowing, the two pieces of paper are stationary, indicating that the air pressure inside and outside the two pieces of paper is ______, and the pressure is also ______.

After blowing

Phenomenon:__________.

Explanation: The air pressure inside the paper is ______, and the pressure is also ______.

Conclusion: The faster the air (fluid) flows, the smaller the pressure it generates.

2. The relationship between fluid pressure and flow rate

Where the flow velocity is high, the pressure is ______.

Where the flow velocity is low, the pressure is ______.

The relationship between gas pressure and flow rate

Blow air along the top of the drooping paper

(1) Phenomenon: The paper will float upwards

(2) Compare the gas flow velocity above and below the paper strip

(3)Explain what you see

The gas flow velocity above the paper strip is high and the pressure is low;

The gas flow velocity below is small and the pressure is strong.

Apply what you learn

1. One of the reasons why smoke from rural stoves is discharged out of the house along the chimney is that the wind blows over the top of the chimney, causing the air flow speed there to ________ and the pressure to be ________, so the smoke is discharged out of the house along the chimney.

2. Make a simple sprayer

The reason why the ball cannot drop

The gas flow velocity above the ball is fast and the air pressure is low.

The gas flow below the ball is slow and the pressure is high.

1. Have you ever had this experience: walking in the rain with an umbrella, as shown in the picture: a gust of wind blew, and the umbrella surface was "sucked" and severely deformed. Which of the following explanations about this phenomenon 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 the speed below

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

2. This is a hot and cold water mixed shower. Please use the knowledge you have learned to explain it.

3. When a car drives quickly across the road, the leaves falling on the road will ( )

A. Flying from the roadside to the car

B. Flying from the road to the road

C. Flying upward

D. Not affected

If the plug at end D of a horizontal pipe is removed and water is poured into container R at the same time, when the water in the pipe flows, will the flow rate be the same in different places of the device?

Please think of the situation of a river. Which flow rate is greater when the water reaches the wide part of the river than where the river reaches the narrow part?

The flow velocity in thinner tubes is greater than the flow velocity in thicker tubes.

Conjecture: If liquids have the same rules as gases, when the water flows, what will happen to the height of the water surface in R and the water surfaces in tubes H, A, and C? Which one is higher?

The water surface in R is lower than H. The height of the water surface in tubes A and C is almost the same, while the water surface in tube B is the lowest. This shows that when the water in the horizontal pipe flows, the pressure of the water at point B is smaller, and the pressure at points A and C is greater than the pressure at point B.

Class summary:

1. Fluid:

2. Fluid pressure:

3. The relationship between fluid pressure and flow velocity was explored through experiments:

4. The lift of the aircraft:

From the pressure difference between the upper and lower surfaces of the wing.

Cause of lift

Where the flow velocity is high, the pressure is low;

Where the flow velocity is small, the pressure is strong.

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"Magical Lift" Buoyancy and Lift PPT Courseware 2:

"Magical Lift" Buoyancy and Lift PPT Courseware 2 1. The relationship between fluid pressure and flow rate Water, air, etc. are fluid, and they are collectively called fluids. When fluid moves, it will show a wonderful characteristic in places with different flow speeds. 1. Fluids: liquids and gases..

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Update Time: 2024-09-02

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 2 industry PPT template

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