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Authoritative PPT Summary
"Pressure of Liquids" Pressure PPT Courseware 5
I believe everyone can do it:
1. Understand the existence of pressure inside the liquid and the direction of the pressure inside the liquid.
2. Understand the factors related to the size of liquid pressure
3. Master the liquid pressure formula and its application
4. Understand the practical application of liquid pressure - connectors, and understand the various connectors in daily life.
Review the past and learn the new
1. What is pressure? What are the effects of stress?
2. What physical quantity does pressure represent? How to define?
doubt
1. Why are the cross-sections of dams narrow at the top and wide at the bottom, trapezoidal in shape?
2. Why do deep-sea fish die after being caught?
3. Why are the deep-sea diving suits worn by divers thicker than shallow-sea diving suits?
2. Experimental Research: Factors Affecting the Internal Pressure of Liquids
Ask the question: What are the factors that affect the internal pressure of a liquid?
Conjectures and Assumptions:
Make plans and design experiments:
Conduct experiments and collect data:
Analyze the data and summarize the conclusions:
Exploration experiment 1
Study the characteristics of liquid pressure at different depths underwater.
Experimental steps: Fix the metal box at a certain depth underwater, change the orientation of the rubber membrane, record the height difference of the liquid level in the U-shaped tube when the rubber is facing up, down and sideways, change the depth of the metal box underwater and do two more experiments. Second-rate.
Exploration experiment 2
Study the relationship between the internal pressure of a liquid and its density.
Experimental steps: Keep the depth of the metal box in the liquid constant, put the metal box into three liquids (salt water, water and alcohol), record the height difference of the U-shaped tube, and change the depth twice.
Summarize:
There is pressure in all directions inside the liquid; at the same depth, the pressure in all directions is _____. As the depth increases, the pressure of the liquid _____; the pressure of the liquid is also related to the density of the liquid. When the depth is the same, the greater the density of the liquid, Pressure _____.
Class summary
1. Characteristics of liquid pressure.
2. Calculation of liquid pressure.
3. Connector
Class exercises:
1. As shown in Figure 13-5, the water in the bottle flows out from small holes A and B, which means that the liquid exerts pressure on the _____ of the container. The water shot out from hole B sprays faster, which means that the pressure of the liquid increases with the pressure of the container. Increases as _____ increases.
2. As shown in Figure 13-6, a container contains a certain amount of water and is placed stationary on an incline. The relationship between the pressures PA, PB, and PC at points A, B, and C at the bottom of the container is: _____.
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