"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 2

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"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 2

1. Fluid

Fluid gases and liquids are collectively called fluids

We have already learned that the pressure inside a liquid and atmospheric pressure are the pressures when the fluid is at rest.

What is the pressure when liquids and gases are in a flowing state?

Inquiry activity 1

Hold two pieces of paper in your hands, let the paper hang down naturally, and blow air downward between the two pieces of paper. Guess how the two pieces of paper will move.

What force brings the two pieces of paper together?

Conclusion 1: Gas pressure is related to gas flow rate. Where the gas flow rate is high, the pressure is small; conversely, where the flow rate is low, the pressure is high.

Exploration activity 2

Place an aluminum coin 2-3cm away from the edge of the table. Place a ruler or pen at a height of about 2cm about 10cm in front of the coin to set up a railing. Blow hard above the coin in a direction parallel to the table. , the coin may jump over the railing. Let's see who can make the coin jump the highest. What force makes the coin jump?

2. The relationship between fluid pressure and flow rate

1. Relationship: In gases and liquids, where the flow velocity is greater, the pressure is smaller.

Regarding the accident that occurred on the train platform, please make some reasonable suggestions to the relevant departments to prevent such accidents from happening.

1. Set up a safety line on the platform, and people must stand 1 meter away from the line.

2. Slow down in advance when the train enters the station

3. The train must sound its whistle when it enters the station.

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

A simple water heater used in rural areas. Place the hot water basin on the ground and connect it to the water pipe with a vertical pipe. When you open the faucet, the hot water will automatically come up and mix with the cold water. What comes out of the nozzle is the mixed water. Warm water. Do you know the reason?

Class exercises

I believe everyone has had this experience: when walking in the rain, we will hold an umbrella. When a strong wind blows, the umbrella will be sucked up. Why is this? Can you explain this phenomenon using what you learned today?

think

1. Observe the shape of the wings of birds and explain why birds do not fall when they spread their wings and glide in the air?

2. The pressure of gas and liquid is affected by the flow rate. What are the advantages and disadvantages in production and life? Please give an example

1. In autumn, the leaves turn yellow and fall on the ground. When a high-speed car passes by, the leaves on the roadside ( )

A. Suction towards the car from the roadside B. Not affected

C. Flying from the middle of the road to the side of the road D. Only flying upward

2. Aircraft wing shape ( )

A.Flat on top, convex on bottom B.Protruding on top, flat on bottom

C. The top and bottom are completely convex D. The top and bottom are completely flat

3． The essence of a tornado is a high-speed rotating airflow. It can "suck" objects or people and animals on the ground into the air. Tornadoes can "suck up" objects because ( )

A. The pressure inside a tornado is much less than the pressure outside

B． Tornadoes increase the buoyancy of air on objects

C. Tornadoes cause objects to experience less gravity

D． The superstitious "dragon" "grabs" objects into the air

4. On windy days, if we walk or ride against the wind on the way to school, when a strong wind blows, we cannot inhale air through our mouth or nose, but we can exhale outward. When the gust of wind passes, we resume normal breathing. yes( )

A When the wind is strong, the air pressure on the face increases, making it difficult for people to breathe.

B When the wind is strong, the air pressure on the face becomes smaller, making it difficult for people to inhale.

C has nothing to do with air pressure, it’s people’s lack of exercise

D When the wind is strong, the air pressure in front of the face is high, so it is easy to exhale outwards

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Update Time: 2024-11-16

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

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