| Category | Format | Size |
|---|---|---|
| Shanghai Science Edition 8th Grade Physics | pptx | 6 MB |
"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 7
Description
"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 7
fluid
1. What is a fluid?
Both liquids and gases are fluid and are collectively called fluids.
2. The pressure when a fluid flows is called fluid pressure.
scientific inquiry activities
(1) Ask the question: What is the relationship between fluid pressure and flow rate?
(2) Conjectures and assumptions
Conjecture ①: The faster liquid and gas flow, the greater its pressure.
Conjecture ②: The faster the liquid and gas flow, the smaller its pressure.
Conjecture ③: Fluid pressure has nothing to do with flow rate
inquiry process
1. Blow into two pieces of paper held parallel to each other. What phenomenon will you find? Why?
Phenomenon: Two pieces of paper are close to each other
Reason: When air is blown, the air inside the paper strip flows quickly and the pressure becomes smaller; the air outside the paper strip flows slowly and the pressure becomes larger, and the two paper strips are pressed together.
2. Place a table tennis ball between two chopsticks and blow air into the middle with a straw. What phenomenon can you see?
in conclusion:
Gas: The pressure is low where the flow velocity is high, and the pressure is high where the flow velocity is low.
3. Put the two pre-folded boats into the water tank, and then use mineral bottles as water pipes to flush the water in the middle of the boats. Observe how the two boats move?
in conclusion:
Liquid: The pressure is low where the flow velocity is high, and the pressure is high where the flow velocity is low.
The relationship between fluid pressure and flow rate:
The fluid has a pressure of _____ where the flow rate is _____,
The pressure _____ where the flow rate _____.
What causes an airplane to gain lift?
The flow velocity at the top is fast and the pressure is small
The flow speed below is slow and the pressure is strong
The wing is made of _____. When sailing, the speed of the airflow above the wing _____ the speed of the airflow below. The air pressure above the wing _____ the air pressure below. The resulting upward pressure difference is the _____ force obtained by the aircraft.
Fighter: Using the "lift obtained by the wings" to take off
Helicopter: Take off using the "interaction force and the relationship between flow velocity and pressure".
Rocket: Taking advantage of "forces are mutual" to take off
Hot air balloon: using "buoyancy" to take off
explain phenomenon
Put one end of the paper close to your lower lip and blow air hard on the top of the paper. Why does the paper float?
When air is blown, the flow velocity of the air above the paper strip is greater than the flow speed below it, and the pressure above the paper strip is smaller than the pressure below it. The pressure difference between the top and bottom of the paper strip causes the paper strip to float.
Why doesn't the ping pong ball fall down when you blow into the funnel?
When blowing air into the funnel, the gas flow rate is fast and the air pressure is low above the ball, while the gas flow rate and pressure are high below the ball. The pressure difference between the top and bottom of the ball prevents the ball from falling.
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For more information about the PPT courseware "The relationship between pressure, fluid pressure and flow rate", please click the "Pressure ppt relationship between fluid pressure and flow rate" ppt tag.
"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT courseware 8:
"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...
"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 6:
"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 6 The Relationship between Fluid Pressure and Flow Velocity 1. Fluid: Both liquids and gases are fluid and are collectively called fluids. 2. Fluid pressure: The pressure when a fluid flows is called fluid pressure. The pressure of flowing air depends on the flow rate...
"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 5:
"The Relationship between Fluid Pressure and Flow Velocity" Pressure PPT Courseware 5 Teaching Objectives 1. Knowledge and Skills Understand the relationship between fluid pressure and flow velocity. Understand how lift is generated in an airplane. Understand the phenomena related to the pressure and flow rate of fluids in daily life. 2. Process and method...
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Update Time: 2024-07-29
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