"Pressure, Pressure and Pressure" PPT

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"Pressure" Pressure PPT (Lesson 1 Pressure and Pressure)

The first part of the content: Practice on classification of knowledge points

Knowledge point 1 Pressure

1. In Figure 9-1-1, the correct representation of pressure is ( )

2. Which of the following statements about pressure is correct ( )

A. The direction of pressure must be perpendicular to the contact surface between objects

B. The magnitude of the pressure must be equal to the gravity of the object

C. In any case, the amount of pressure has nothing to do with the gravity on the object.

D． The direction of pressure is always the same as the direction of gravity

3． As shown in Figure 9-1-2, an object weighs 10 N and a force of 30 N is used to press the object perpendicularly to the wall. The pressure on the wall is ( )

A. 10 N B. 20N

C. 30N D. 40N

Knowledge Point 2 Explore the factors that affect the effect of stress

4. As shown in Figure 9-1-3, use your fingers to hold a pencil that is sharpened at one end. The degree of depression on the two finger surfaces is ________ (please fill in "the same" or "not the same"), which means: _______________________________________________

______________________.

5. In the experiment of "exploring what factors are related to the effect of pressure", Xiao Ming used small tables, weights, sponge blocks and other equipment to design several experiments as shown in Figure 9-1-4.

(1) In the experiment, Xiao Ming compared the effect of pressure by observing the ________ of the sponge block.

(2) The conclusion that can be drawn by observing and comparing Figures A and B is: when the force-bearing area is constant, the larger _____, the more obvious the effect of pressure.

(3) To explore the relationship between the effect of pressure and the force-bearing area, we should compare the experiments of the two pictures of _______. The conclusion drawn is: _______________________________________.

(4) The research methods used in the experiment are ___________ and _______.

(5) In physics, ______ is used to express the effect of pressure.

Knowledge point 3 Pressure

6． The ratio of __________ and _________ to an object is called pressure, represented by the symbol _____. The formula for calculating pressure is ______, and the unit is _______.

7. A middle school student has a mass of 50 kg, and the contact area of ​​each foot with the horizontal ground is 200 cm2. When standing with both feet, his pressure on the ground is _____N, and his pressure on the ground is ________Pa. (g is taken as 10 N/kg)

8. As shown in Figure 9-1-5, when a green brick is placed on the horizontal ground in three ways: flat, side or vertical, its pressure on the ground will be ______ (optional "same" or "different" ); the pressure on the ground when the bricks are placed ____ is the smallest; if half of the bricks are cut in the vertical direction when placed vertically, the remaining half will exert pressure on the ground ______ (optional "get smaller", "get bigger" or "constant").

Pressure PPT, part 2: Comprehensive training with regular methods

9. As shown in Figure 9-1-6, on level snow, Fangfang wearing a sled has a total mass of 70 kg and does not sink into the snow; while Xiao Ming wearing sneakers has a total mass of 50 kg but sinks deeply into the snow. Which of the following statements is correct ( )

A. Fangfang’s pressure on the snow is less than Xiaoming’s

B. Fangfang’s pressure on the snow is the same as Xiaoming’s

C. Fangfang’s pressure per unit area of ​​snow is smaller than Xiao Ming’s

D． The force-bearing area and pressure are both different. It is impossible to compare who exerts greater pressure on the snow.

10. Which of the following statements about pressure and pressure is correct ( )

A. The greater the pressure, the greater the pressure generated must be

B. The larger the pressure area, the greater the pressure generated.

C. The greater the gravity on an object, the greater the pressure it produces

D． The pressure remains unchanged, the smaller the pressure area, the greater the pressure

11． Shaolin Kung Fu is famous all over the world, and the unique skill of "Two Finger Zen" is amazing. During the performance, the human body stands upside down, using only the middle and index fingers to support the weight of the whole body. At this time, the pressure between the two fingers on the ground is closest to ( )

A. 3×102 Pa

B. 3×104 Pa

C. 3×106 Pa

D. 3×108 Pa

12. An elephant has a mass of 6×103 kg. The area of ​​each foot is 600 cm2. The gravity it experiences is _______N. The pressure on the ground when its four feet touch the ground is ________Pa. If an elephant lifts one leg, its pressure on the ground will be _____ (choose "get bigger", "get smaller" or "unchanged"). (g is taken as 10 N/kg)

13. As shown in Figure 9-1-7, a student uses a spring dynamometer to pull a wooden block placed on a horizontal table to slide in a straight line at a constant speed. When the front end of the wooden block leaves the table and is halfway out of the table, the spring dynamometer Indicate _____, the pressure of the wood block on the tabletop _____, the pressure of the wood block on the tabletop _____. (Please choose "get bigger", "get smaller" or "unchange")

14. Przewalski's horse is a nationally protected animal. Members of my country's animal protection organization once discovered some footprints left by Przewalski's horses on the sand when drinking water, with a depth of 1.2 cm (all four hooves on the ground). Through experiments, it was determined that the pressure required for the sand to sink to the same depth is 9×104 Pa. From this, it is estimated that the mass of an adult Przewalski's horse is approximately 360 kg.

(1)The purpose of reaching the same depth when conducting experiments on sand is ____________________________.

(2) The pressure of an adult Przewalski's horse on the sand is about ______N, and the area of ​​one hoofprint is about _____cm2. (g is taken as 10 N/kg)

Pressure PPT, the third part: practical practice of high-frequency test questions

16．2018·Wuhan As shown in Figure 9-1-9, in the experiment of "exploring the factors affecting the effect of pressure", the following statement is correct ( )

①In the two experiments A and B, the pressure exerted by the small table on the sponge was equal.

②The effect of the small table on the sponge pressure in Picture A is more obvious than that in Picture B

③Two experiments, A and B, show that the effect of pressure is related to the size of the pressure.

④In order to complete the entire experiment, you can remove the weights in Figure B and compare the experimental phenomena you see with those in Figure A

A. ①② B． ①②④

C. ①③④ D. ②③④

17．2018·Yueyang Excerpt As shown in Figure 9-1-10, a rectangular cube with a uniform texture weighing 7 N is placed on a horizontal table. Its contact area with the table is 0.01 m2, so its pressure on the table is _____Pa.

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"Pressure" Pressure PPT (Application of Pressure in Lesson 2):

"Pressure" Pressure PPT (Application of Pressure in Lesson 2) Part One: Classification Practice of Knowledge Points Knowledge Point 1 Methods of increasing and decreasing pressure 1. Among the four examples shown in Figure 9-1-11, the one that increases pressure is () 2. A blind trail is a way for blind people to walk..

"Pressure" Pressure PPT download:

"Pressure" Pressure PPT Download Part One Content: Knowledge Points Basic Knowledge Point 1 Pressure 1. A block with a mass of 10 kg is placed on the horizontal ground. Its contact area with the ground is 100 cm2, then its pressure on the ground is 1104 Pa(g=10 N/kg). 2.About...

"Pressure" Pressure PPT:

"Pressure" Pressure PPT Part One Content: Preview Perception 1. Explore the influencing factors of pressure effect 1. Exploration method: Control variable method. 2. Research conclusion: It is related to the size of the pressure and the stress area. (1) The force-bearing area is fixed. The greater the pressure, the greater the effect.

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Update Time: 2024-09-30

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