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"Understanding Pressure" Magical Pressure PPT Courseware 2
1. What is pressure?
Carefully observe the following three pictures. Which force is studied in the pictures? What are the characteristics of the directions of each force? What effects do they have on the force-bearing objects?
1. The force of the ink bottle pressing on the tabletop is perpendicular to the tabletop, causing the tabletop to bend (slightly).
2. The force of the finger pressing the nail bump is perpendicular to the nail bump surface, causing the nail bump surface to bend (slightly).
3. The force of the heavy object pressing the belt is perpendicular to the belt, causing the belt to bend.
4. Direction: can be in all directions;
But it must be perpendicular to the surface of the force-bearing object and pointed to the inside of the force-bearing object.
5. Action point: the surface of the force-bearing object.
6. Size: May or may not be related to gravity.
7. Unit: N
8. Symbol: F
[Example 1] The schematic diagram of each force as shown in the figure, which can correctly reflect the pressure of the object on the incline is ( )
[Example 2] Which of the following statements is correct ( )
A. The greater the gravity on an object, the greater the pressure it will produce.
B. Pressure can be related to gravity, or it can have nothing to do with gravity.
C. The direction of pressure is always vertical downwards
D. The effect of pressure is to deform the object under pressure
2. Explore the effects of stress
Ask a question:
What factors may be related to the effects of stress?
Conjectures and Assumptions:
Conjecture 1: The effect of pressure may be related to ( )____________;
Conjecture 2: The effect of pressure may be related to ( )____________;
3. What is pressure?
1. Definition of pressure:
The ratio of the pressure on the surface of an object to the force-bearing area is called pressure. Pressure is represented by P, which is a physical quantity used to express the effect of pressure.
2. Pressure calculation formula
Pressure = Pressure/Stressed Area
3. Unit of pressure: Pascal (Pa) (1Pa=1N/m2)
Physical meaning - 1N of pressure per square meter of area
4. How to increase or decrease the pressure?
Methods to increase pressure: If the pressure is constant, reduce the stress area; if the stress area is constant, increase the pressure.
Methods to reduce pressure: When the pressure is constant, increase the stress-bearing area; when the stress-bearing area is constant, reduce the pressure.
summary:
pressure
Definition: Force acting vertically on the surface of an object
Direction: perpendicular to the surface of the force-bearing object
The effect of pressure and the magnitude of pressure
The size of the pressure area
pressure
Physical meaning: a physical quantity that represents the effect of pressure
Definition: The pressure exerted by an object per unit area is called pressure
Formula: p=F/S
Unit: 1N/m2=1Pa
application:
How to increase pressure
increase pressure
Reduce pressure area
Ways to reduce pressure
Reduce stress
Increase pressure area
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"Understanding Pressure" Magical Pressure PPT Courseware 3:
"Understanding Pressure" Magical Pressure PPT Courseware 3 These examples are all related to the effects of pressure. What is stress? What factors are related to the effects of stress? 1. Pressure: The force of the phone pressing vertically on the table. The child pressing vertically on the ground..
"Understanding Pressure" magical pressure PPT courseware:
"Understanding Pressure" Magical Pressure PPT Courseware Teaching Objectives: Know what pressure is and the difference between pressure and gravity. Know what factors are related to the effect of pressure. Know what pressure is, its calculation formula and units. Know how to increase and decrease pressure...