"Pressure" PPT courseware 3

Description

"Pressure" PPT courseware 3

1. The concept of pressure:

The force of the cup pressing vertically against the ground

The force of the thumbtack pressing vertically against the wall

The force exerted by the block vertically pressing on the incline

The force that presses vertically on the surface of an object is called pressure and is represented by F.

Direction: vertical to the surface of the stressed object

Ask a question

What factors are related to the effect of stress?

guess

The effect of pressure may be related to the size of the pressure and the size of the force-bearing area of ​​the object.

Exploration 1

Control the force-bearing area to be constant, and study the relationship between the effect of pressure and the magnitude of the pressure.

Exploration 2

Control the pressure to be constant, and study the relationship between the effect of pressure and the force-bearing area.

get conclusion:

When the stress area is the same, the greater the pressure, the more obvious the effect of pressure; the smaller the pressure, the smaller the effect of pressure.

When the pressure is the same, the larger the stressed area, the smaller the effect of pressure; the smaller the stressed area, the more obvious the effect of pressure.

There is a certain limit to the ability of any object to withstand pressure. If it exceeds this limit, the object will be crushed. In order not to crush the object, it is necessary to reduce the pressure, and in some cases it is necessary to increase the pressure. Look at the picture below, discuss and answer the questions in the picture.

Can you summarize the methods of increasing and decreasing pressure through the example just now?

When the pressure F is increased and F is constant, decrease S

When S is constant, increase F

Decrease S and increase F at the same time

Reduce the pressure. When F is constant, increase S.

When S is constant, decrease F

Increase S and decrease F at the same time

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Update Time: 2024-11-16

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

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