"Integration of this Chapter" Pressure PPT

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"Integration of this Chapter" Pressure PPT

High School Entrance Examination Focus Experience

1. (2018 Hunan Changde High School Entrance Examination) Among the four animal organs shown in the picture, the one with the function of reducing pressure is ()

The woodpecker's beak is very pointed, and when the pressure is constant, it increases the pressure by reducing the force-bearing area, so A does not meet the meaning of the question; the camel's paws are very large, and when the pressure is constant, it increases the force-bearing area. Reduce the pressure, which makes it easier for camels to walk in the desert, so B is consistent with the meaning of the question; crocodile teeth are very sharp, and when the pressure is constant, the pressure is increased by reducing the force-bearing area, so C is not consistent with the meaning of the question; The mouthparts of mosquitoes are pointed and they increase the pressure by reducing the force-bearing area when the pressure is constant, so D does not meet the meaning of the question.

2. (2018·Shandong Linyi High School Entrance Examination) Which of the following four pictures is correct ()

3. (2018·Shandong Yantai High School Entrance Examination) The picture on the right is an automatic water supply device designed by Xiao Ming for the bonsai at home. He filled a plastic bottle with water and placed it upside down in the bonsai. The mouth of the bottle was just submerged in water, so that the water level in the bonsai Can maintain a certain height. The reason why all the water in the plastic bottle will not drain out immediately is ()

A. Due to the effect of buoyancy

B. Affected by external atmospheric pressure

C. Due to the supporting force of the bonsai plate

D. The mouth of the bottle is too small, making it difficult for water to flow out.

Standard atmospheric pressure can support a water column of about 10.13 m high. The water surface in the bottle can be higher than the water surface in the basin and will not flow out. It is precisely because the water in the bonsai is connected with the atmosphere. It is the atmospheric pressure that supports the water in the bottle and will not flow out.

4. (2017·Zhejiang Quzhou High School Entrance Examination) Xiao Ke designed a balloon that does not need to be tied with a rope. As shown in the picture, first put the balloon into a glass bottle, then tighten the ball mouth on the mouth of the glass bottle, and draw air from the exhaust port. Inflate and observe that the balloon becomes larger; after stopping pumping, immediately seal the exhaust port with a rubber sleeve. At this time, the balloon can remain inflated without being tied with a rope. Assume that the air pressures in the balloon before and after pumping are p1 and p2 respectively, and the air pressures in the bottle are p3 and p4 respectively, then which of the following relationships is correct ()

A.p1

C.p3

5. (2017·Shandong Dongying High School Entrance Examination) Small "whirlwinds" often appear on campus. When the "whirlwind" passes by, the speed of the airflow in the center of the vortex is _______ (select "big" or "small"), and the gas pressure inside the vortex is ______ , it is easy to "suck" the paper scraps on the ground into the air.

6. (2017 Shanxi High School Entrance Examination) Xiao Ming added water to his mother’s transparent teapot and placed it on the table, as shown in the picture. When her mother saw it, she asked, "Why did you only add half a pot of water?" Xiao Ming said, "I'm worried that if I add a little more, the water will overflow from the thin spout." Her mother said, "Try adding some water and see. "So after repeatedly adding water several times, Xiao Ming understood: the spout and body of the teapot form _______, and the water surface in the spout and body has the characteristics of __________, so there is no need to worry about overflowing if you add a little water. .

Analysis: The spout and body of the teapot form a connector. When the water inside does not flow, the water surface of the spout and the water surface of the body remain level.

Answer Connector Height is always the same

Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, integrated PPT download for this chapter, pressure PPT download, .PPT format;

For more information about the PPT courseware "Integrating Pressure in This Chapter", please click the Integrating PPT in This Chapter and Pressure PPT tab.

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Update Time: 2024-07-31

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

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