"Understanding some physical properties of matter" Materials around us PPT courseware 2

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"Understanding some physical properties of matter" Materials around us PPT courseware 2

Think: What is the material composition of each of the above objects? What properties do these substances have?

1. "Goujian Sword and Fucha Spear" are composed of alloys such as bronze and tin, mainly utilizing its hardness properties.

2. "Shanghai Jinmao Tower, the third largest building in the world and the largest in China," is a magnificent building. It uses glass, sound insulation panels, and hollow brick building materials. This material has transparent, sound insulation, and heat insulation properties.

3. The water jug ​​is made of ceramics. It is used to hold water and mainly utilizes its thermal insulation properties.

4. The filament is hot up to a thousand degrees and can be used continuously for a long time. The filament is composed of tungsten filament, which is mainly used for its conductivity and high melting point.

1. Magnetism of matter

2. Conductivity of matter

Conductor: An object that easily conducts electricity

Insulator: an object that does not conduct electricity easily

Semiconductor: An object between a conductor and an insulator

Germanium, silicon, gallium arsenide, etc. are all semiconductor materials

3. Thermal conductivity of matter

Objects that easily conduct heat are good conductors of heat

Objects that do not conduct heat easily are poor conductors of heat

practice

1. During the physical examination for the high school entrance examination, the doctor used white wine, white vinegar and water to let the students distinguish. This was based on the difference in their ________.

2. There are the following 6 substances: iron, milk, crystal, liquor, mercury, and biscuits. They can be divided into two categories:

One category includes _______________________,

It is characterized by ____________________.

Another category includes _______________,

It is characterized by ____________________.

Play games: listen to instructions and hold up signs. Give cards marked with six substances: nickel, copper, silicon, plastic, diamond, and seawater to the six students in the front row.

(1) Who can be attracted by a magnet?

(2) Who is a good conductor of heat?

(3) Who has the greatest hardness?

(4) Who is the conductor?

(5) Who is an insulator?

(6) What are the materials used to make semiconductors?

(7) Who is liquid?

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Update Time: 2024-07-07

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 1 industry PPT template

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