"Pressure of Liquids" Pressure PPT Courseware 3

Description

"Pressure of Liquids" Pressure PPT Courseware 3

learning target

1. Remember the rules of liquid pressure through experiments.

2. Learn to use a pressure gauge to measure pressure, and be able to reason and remember the formula for liquid pressure.

3. Be able to use the laws of liquid pressure to explain phenomena in life.

4. Know what a connector is and how the ship lock works.

Whose effect is the film protruding below?

If there is something like this on the side, will it stick out?

Will the protrusion become worse if more water is poured in? What does it mean?

step

Put the probe into a container of water to see if there is pressure inside the liquid. Keep the depth of the probe in the water constant, change the direction of the probe, and see if the pressure in the liquid at the same depth is equal in all directions.

Increase the depth of the probe in the water and see how the pressure inside the liquid is related to the depth.

Switch to salt water and see if the pressure inside the liquid is related to the density at the same depth.

2. Characteristics of liquid pressure

The liquid exerts pressure on the bottom and walls of the container

There is pressure inside the liquid in all directions

The pressure of a liquid increases with depth

At the same depth, the pressure of a liquid is equal in all directions

The pressure of different liquids is also related to density. When the depth is constant, the greater the density of the liquid, the greater the pressure.

Derivation of liquid pressure formula

The volume of the water column is V=Sh

The density of water is ρ

The mass of the water column is m=ρV

The pressure of the water column on the bottom area is F=G=mg =ρVg =ρShg

The pressure of the water column on its base area is

p=F/S=ρShg/S =ρgh

4. Connector

1. Definition: A container with an open upper end and a connected lower part is called a connector

2. Features: If there is only one kind of liquid in the connector, the liquids in each container of the connector will always remain equal when the liquid does not flow.

3. Application of connector - ship lock

The two-line five-level ship lock of the Three Gorges Dam is 6.4 kilometers long, with a height difference of 113 meters. Ships must climb as high as a 40-story building to pass through the lock. Its scale is unparalleled in the world and it is the largest ship lock in the world. The gates of the Three Gorges Ship Lock are very tall. Each gate of the first-level herringbone gate is nearly 40 meters high and more than 20 meters wide. If placed flat on the ground, it would be as big as two basketball courts.

In-class testing

1. Can a person dive infinitely deep in the water?

2. There are three people A, B, and C. The diastolic blood pressure and systolic blood pressure measured by the body are A: 13 kPa, 16 kPa; B: 9 kPa, 11 kPa; C: 8.5 kPa, 16 kPa. Ask if the blood pressure of these three people is normal?

3. In a five-story building in a certain place, the internal tap water is supplied from the water tank on the roof. When the taps on the first and fifth floors are opened to the same size, it is found that the water on the first floor is turbulent and the water on the fifth floor is gentle. This is because ( )

A. The water in the pipe on the first floor is shallow and the water in the pipe on the fifth floor is deep.

B. The pressure of the water on the first floor is strong, but the pressure of the water on the fifth floor is small.

C. Maybe the spout of the faucet on the fifth floor faces upwards.

D. The water level in the water tank is too low

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

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Update Time: 2024-10-02

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

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