"Understanding Pressure" Magical Pressure PPT Courseware

Description

"Understanding Pressure" Magical Pressure PPT Courseware

teaching objectives

Know what pressure is and the difference between pressure and gravity.

Know what factors are related to the effects of stress

Know what pressure is, its calculation formula and units.

Know how to increase and decrease pressure

Detection preview one:

1. What is pressure and what is its direction?

2. What is the difference between pressure and gravity?

Pressure - the force acting vertically on the surface of an object

observe

Think: What factors may be related to the effects of stress?

how to explore

Equipment provided: weights, small table, a plate of sand

Please tell me your experimental methods or steps

A: When the pressure is equal, change the contact area and observe the strength of the pressure effect in the two experiments.

B: When the contact areas are equal, change the pressure and observe the strength of the pressure effect in the two experiments.

Study 1:

The relationship between the effect of pressure and the amount of pressure

Because the effect of stress may be related to multiple factors, it is necessary to use the control variable method appropriately during the exploration process.

Conclusion: The effect of pressure is related to the amount of pressure

Exploration 2:

The relationship between the effect of pressure and the force-bearing area

in conclusion:

The effect of pressure is related to the force-bearing area

On-the-job training:

A person's gravity is about 600 N, and the area of ​​each foot contacting the ground is about 0.017m2. What is the approximate pressure on the ground when the person is standing?

Ask students to think about it: when people walk, the pressure on the ground is greater or less than when they stand?

Think about it: How big is 1Pa? Please read the pressure of some objects in Figure 8-4 on page 63 of the text.

Do it

1. Regarding pressure and pressure, which of the following statements is correct ( )

A. Pressure is caused by the gravity of an object

B. The direction of pressure is always vertical downwards

C. The smaller the pressure, the smaller the pressure

D. When the pressure is equal, the larger the stressed area, the smaller the pressure.

2. You are standing on flat ground. Please think of a way to double the pressure on the flat ground in the shortest possible time.

Class tracking feedback

1. Regarding pressure, which of the following statements is correct ( )

A. If the pressure is high, the pressure must be high.

B. If the stressed area is large, the pressure must be small.

C. If the force-bearing area per unit pressure is large, the pressure must be large.

D. If the pressure per unit stressed area is large, the pressure must be large.

2. As shown in the picture, press the pencil with two fingers to keep it still. Which of the following statements is correct ( )

A. The pressure on both fingers is the same, and the pressure on the left finger is greater.

B. The pressure on both fingers is the same, and the pressure on the left finger is greater.

C. The pressure on both fingers is the same, and the pressure on the right finger is greater.

D. The pressure on both fingers is the same, and the pressure on the right finger is greater.

Increase and decrease in pressure

1. Look at the picture and analyze the following examples

Ways to increase pressure and ways to decrease pressure:

increase pressure

1. When the stress area is constant, increase the pressure

2. When the pressure is constant, reduce the stress area

3. Increase the pressure and reduce the stress area at the same time

reduce pressure

1. When the pressure is constant, increase the stress area

2. When the stress area is constant, reduce the pressure

3. Reduce the pressure and increase the stress area at the same time

Operation

After class exercises

Preview

1. How is liquid pressure generated?

2. What are the characteristics of the internal pressure of liquid?

3. How to calculate the internal pressure of a liquid?

4. What are the characteristics of the connector?

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For more information about the "Magical Pressure Understanding Pressure" PPT courseware, please click the Magical Pressure PPT Understanding Pressure PPT tag.

"Understanding Pressure" Magical Pressure PPT Courseware 3:

"Understanding Pressure" Magical Pressure PPT Courseware 3 These examples are all related to the effects of pressure. What is stress? What factors are related to the effects of stress? 1. Pressure: The force of the phone pressing vertically on the table. The child pressing vertically on the ground..

"Understanding Pressure" Magical Pressure PPT Courseware 2:

"Understanding Pressure" Magical Pressure PPT Courseware 2 1. What is pressure? Carefully observe the following three pictures. Which force is studied in the pictures? What are the characteristics of the directions of each force? What effects do they have on the force-bearing objects? 1. The force of the ink bottle pressing on the table...

File Info

Update Time: 2024-07-05

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

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