"Pressure" PPT download

Description

"Pressure" PPT download

Part One: Review

1. What is pressure? What factors are related to the effects of stress?

A force acting perpendicularly to the surface of an object. Factors that affect its effect include: the size of the pressure and the size of the force-bearing area.

2. What is pressure?

Pressure is a physical quantity that quantitatively expresses _________. Its calculation formula is _________.

The meaning of 2×103 Pa is _________.

The pressure on an object per square meter of force area is 2×103 N.

3. Among the following statements about pressure, which one is correct ( )

A. The greater the pressure, the greater the pressure

B. The larger the stressed area, the smaller the pressure.

C. The greater the pressure per unit area, the greater the pressure.

D. The greater the gravity, the greater the pressure it generates

4. Three solid cylinders made of the same material have the same height. The masses of A, B, and C are 2 kg, 4 kg, and 8 kg respectively. If they are placed vertically on the horizontal ground, the pressure on the ground will be ( )

A. A is the biggest B. B is the biggest

C. C is the largest. D. All three are the same size.

Pressure PPT, Part 2 Content: Discussion:

1. What methods can be used to increase pressure? for example.

Answer: Increase the pressure and reduce the stress area.

2. What methods can be used to reduce pressure? for example.

Answer: Reduce the stress area and increase the pressure.

Observe and think

How can a tiny cicada insert its thin mouthparts into the thick bark of a tree?

Why is it easier to cut an orange with a sharp knife?

The blade is sharp, which reduces the force-bearing area. When the pressure is constant, the pressure on the orange can be increased, making it easier to cut the orange.

Pressure PPT, Part 3: Methods of increasing and decreasing pressure

1. Methods to increase pressure

1) The pressure remains unchanged and the stress area is reduced.

2) The force-bearing area remains unchanged and the pressure increases.

3) Increase the pressure and reduce the stress area

2. Methods to reduce pressure

1) The pressure remains unchanged and the stress area is increased.

2) The force-bearing area remains unchanged and the pressure is reduced.

3) Reduce pressure and increase stress area

Pressure PPT, Part 4: Practice

1. As shown in the figure, the density of a block is 5g/cm3, the length is 10cm, the width is 4cm, and the height is 5cm. What is the pressure of the block on the ground as shown in Figure 1?

2. If it is cut off in the middle, what is the pressure of each piece on the ground?

3. If it is placed on the horizontal ground as shown in Figure 2 on the right, what is its pressure on the ground?

4. When the bricks are placed flat, sideways or vertically on the ground, as shown in the figure, the pressure of the bricks on the ground is equal. When the bricks are _____, they have the greatest pressure on the ground. When the bricks are _____, they have the greatest pressure on the ground. The pressure is minimal.

5. In daily life, people who sit on sofas and wooden chairs for long periods of time do not feel pain easily because of ____. Can you tell the scientific reason why?

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, pressure PPT download, .PPT format;

For more information about the "Pressure" PPT courseware, please click the "Pressure PPT" tab.

"Comprehensive calculation and judgment about pressure and buoyancy" Buoyancy PPT:

"Comprehensive Calculation and Judgment of Pressure and Buoyancy" Buoyancy PPT 1.094 submarine is a new generation of submarine independently developed by our country. When it floats up from the deep sea without emerging from the water, it is subjected to ( ) A． Pressure decreases, buoyancy remains unchanged B. pressure..

"High School Entrance Examination Real Questions Link" Pressure PPT:

"High School Entrance Examination Real Questions Link" Pressure PPT Type 1 Pressure 1. 2018 Deyang There are many applications of physical knowledge in production and life. Which of the following statements is correct ( ) A. The purpose of making the schoolbag straps flat and wide is to reduce the pressure of the schoolbag on the human body. B. Snowboards are generally...

"Classified Comprehensive Training" Stress PPT:

"Classified Comprehensive Training" Pressure PPT Part One: Breakthrough of Core Key Points 1. Pressure 1. Pressure: The force acting on the surface of an object due to _____ occurring between objects is called pressure. The direction of the pressure is ______ with the force-bearing surface, and the point of action of the pressure is ____..

File Info

Update Time: 2024-07-02

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

Preview