"Pressure" PPT courseware 9

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"Pressure" PPT courseware 9

review:

1. Force is the effect of ______ on _____. In the International System of Units, the unit of force is _________.

2. The schematic diagram of force is a method that uses a ________ line segment to express the ________, ________ and ________ of the force.

3. The effect of force: ____________________________.

4. The force exerted on objects near the ground due to the attraction of the earth is called ________, and its direction is always ________.

Taking advantage of this property, construction workers often use heavy hammer wires to check whether walls are __________.

5. In the relationship between the gravity and mass of an object, G=mg, G represents ______ and m represents ________. When the unit of m is kilogram, the unit of G is ______.

Self-study guidance

What is pressure?

What factors are related to the effects of stress?

What is pressure? Expression for pressure? unit?

How to increase and decrease pressure?

1. The concept of pressure:

The force of a child pressing vertically on the ground

The force of the thumbtack pressing vertically against the wall

The force exerted by the block vertically pressing on the incline

1 Definition: The force that presses vertically on the surface of an object is called pressure

2. Direction of pressure:

It is always perpendicular to the object surface (i.e. the contact surface) and pointed towards the pressed object.

Understand the relationship between gravity and pressure

1. The pressure on some objects is caused by gravity.

2. The pressure on some objects has nothing to do with gravity.

Pressure may or may not be related to gravity

On a horizontal plane, the pressure is equal to the force of gravity

3. Definition: The ratio of the pressure on an object to the force-bearing area

The formula for pressure:

Pressure = Pressure/Stressed Area

P=F/s

Units of pressure:

International unit: Pascal

Abbreviation: Pa

Symbol: Pa

Increase and decrease pressure

The way to increase the pressure is to increase the pressure or reduce the stress area; conversely, you can reduce the pressure or increase the stress area to reduce the pressure.

In daily life, how to increase or decrease the pressure according to needs?

5. Increase and decrease pressure

1. Increase pressure

When the stress area is constant, increase the pressure F

When the pressure is constant, reduce the stress area S

2. Reduce the pressure

When the stress area is constant, reduce the pressure F

When the pressure is constant, increase the stress area S

summary

1. The force acting vertically on the surface of an object is called pressure. The direction of pressure is always perpendicular to and toward the object being pressed.

2. Pressure: (in physics, pressure is used to express the effect of pressure)

1. Definition of pressure: The pressure exerted on an object per unit area is called pressure.

2. Pressure formula: P=F/S

3. Pressure unit:

In the International System of Units, the unit of force is Newton, the unit of area is meter 2, and the unit of pressure is Pascal, or Pa for short, represented by the symbol Pa.

3. Methods of increasing and decreasing pressure

1. Methods to increase pressure: (1) When the stressed area remains unchanged, increase the pressure and increase the pressure; (2) When the pressure remains unchanged, reduce the stressed area and increase the pressure.

2. Methods to reduce pressure: (1) When the stressed area remains unchanged, reduce the pressure to reduce the pressure; (2) When the pressure remains unchanged, increase the stressed area and reduce the pressure.

practise

1. Pressure is the force ________ pressing on the surface of an object. The effects of pressure are related to _____________ and _____________

2. The effect of pressure is expressed by ________. The unit of pressure is _______________, or ______ for short.

3. When the pressure is constant, we can use the method of increasing ______________ to reduce the pressure. When the stressed area is constant, we can use the method of ____________ to increase the pressure.

4. A rectangular brick is placed on the ground. Among the different placement methods, the one with the greatest pressure on the ground is ( )

A Place it flat B Place it sideways C Place it vertically D The three ways of placing it are the same size

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Update Time: 2024-10-01

This template belongs to Physics courseware Lu Jiao Edition Eighth Grade Physics Volume 2 industry PPT template

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