"Pressure" Pressure PPT download

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"Pressure" Pressure PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Pressure

1. A block with a mass of 10 kg is placed on a horizontal ground. Its contact area with the ground is 100 cm2, so its pressure on the ground is 1×104 Pa (g=10 N/kg).

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

A. The direction of pressure is always vertical downwards

B. The direction of pressure is always perpendicular to the support surface

C. The greater the gravity of the object, the greater the pressure on the support surface.

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

3. The pressure on the ground when a student is standing is 2×104 Pa, which means (C)

A. The pressure on the ground of 1 m2 is 2×104 Pa

B. A pressure of 1 N acts on the ground with an area of ​​2×104 m2

C. The pressure on the ground of 1 m2 is 2×104 N

D. The student’s pressure on the ground is 2×104 N

Knowledge point 2: How to reduce or increase pressure

4. Bulldozers have wide tracks to reduce pressure by increasing the stress-bearing area; axes have narrow blades to increase pressure.

5. The attentive Zheng Mingfei found that his father wanted to sharpen the kitchen knife that had been used at home for a while. This was to reduce the "stress-bearing area" and thereby increase the "pressure".

6. Among the following examples, the one that increases pressure is (D)

A. Lay sleepers under the rails

B. Skiing with skis

C. The schoolbag straps are made wider

D. The head of the iron nail is made very sharp

Pressure PPT, Part 2: Improvement of Comprehensive Ability

8. The air bag is a commonly used equipment in earthquake rescue operations. It is known that the pressure of a certain type of air bag is 6.8×105 Pa. When the contact area between the heavy object and the air bag is 2 m2, the pressure of the air bag is The pressure is 1.36×106 N.

9. With the popularity of some variety shows, the acupressure board, a prop that appeared in the show, has also become popular. Its surface is regularly covered with acupressure protrusions. People wearing soft-soled shoes or walking barefoot on it can fitness. Compared with people walking on a flat road, the pressure exerted by the protrusions on the soles of the feet remains unchanged, and the pressure becomes greater (choose "increase", "become smaller" or "unchanged").

10. As shown in the figure, when a bottle that is not filled with water stands upright on a horizontal table, the pressure of the bottle on the table is p1, and the pressure of the water on the bottom of the bottle is F1; when it is inverted, the pressure of the bottle on the table is p2. The pressure of water on the bottle cap is F2, then p1 is less than p2 and F1 is greater than F2 (please fill in "greater than", "less than" or "equal to").

11. Place a brick vertically on the horizontal ground in three ways. The ratio of the contact areas between the three different surfaces and the ground is 1:3:5, then the ratio of its pressure on the ground is (D)

A.1:1:1 B.1:3:5

C.5∶3:1 D.15∶5:3

12. If there are two pairs of footprints of the same depth and different sizes on the beach, then (D)

A. People with large footprints exert strong pressure on the beach

B. People with small footprints put more pressure on the beach

C. People with big and small footprints exert the same pressure on the beach

D. People with big and small footprints exert the same pressure on the beach

Pressure PPT, the third part: Expansion, exploration and breakthrough

20. As shown in the picture, in the experiment to explore "what factors are related to the effect of pressure", Xiao Cong filled the discarded mineral water bottles with water and placed them upright and upside down on the sponge to conduct the experiment.

(1) Analyzing experiments, it can be concluded that when the pressure is constant, the smaller the force-bearing area, the more obvious the effect of pressure;

(2) The methods used in this experiment to study physical problems include AD;

A. Control variable method B. Experimental reasoning method

C. Analogy method D. Conversion method

(3) Using existing equipment, Xiao Cong wants to explore the relationship between the effect of pressure and the amount of pressure. What should he do? Pour out part of the water in the inverted mineral water bottle, then stand it upside down on a sponge, and compare the two times before and after. The degree of depression in the sponge.

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Update Time: 2024-11-18

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

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