"Classifying the Materials Around Us" Materials Around Us PPT Courseware 2

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"Classifying the Materials Around Us" Materials Around Us PPT Courseware 2

Some of the materials we use are natural materials, such as wood, clay, cotton, leather, etc. We can use these materials directly and make corresponding items according to their respective characteristics.

Some are man-made materials, such as plastics, bricks, ceramics and rubber. People process substances in nature to give them some of the properties we need, and then use them.

1. Characteristics of metal: (hard), (metallic luster), (ductile), (easy to conduct heat), (can conduct electricity), (poor water absorption), etc.

2. Characteristics of plastic: insulating, flexible, waterproof, flammable, corrosion-resistant, able to float on water, relatively light, does not decompose, is not easy to transfer heat, and can be reused

Compare the flexibility of metal strips, cardboard strips, wooden strips, and plastic strips:

Prepare metal strips, cardboard strips, wooden strips, and plastic strips of the same width and thickness, and place them side by side on the edge of the horizontal tabletop. Press one end with a heavy object, and the other end extends out of the tabletop by the same length, and hang it underneath. For objects of the same weight, it was found that the plastic strip bends the most, indicating that the plastic strip is the most flexible.

Characteristics of plastic: insulating, flexible, waterproof, flammable, corrosion-resistant, able to float on water, relatively light, does not decompose, is not easy to transfer heat, and can be reused

Description of the characteristics of bricks and tiles: The surface is relatively rough, has small holes, is relatively hard, and is mostly yellow-red.

Characteristics of ceramics: smooth surface, various colors, shiny, hard

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"Classifying the Materials Around Us" Materials around us PPT:

"Classifying the Materials Around Us" Materials Around Us PPT Part One Content: Classifying Them Based on the knowledge learned previously, take a look at what materials the items in the picture below are made of? Classify these items according to the materials used, writing at least...

"Classifying the Materials Around Us" Materials Around Us PPT Courseware 4:

"Classifying Materials Around Us" Materials Around Us PPT Courseware 4 Natural Materials: Materials that come directly from nature are called natural materials! Man-made materials: Some materials do not come from nature, but are processed natural materials, or the properties of natural materials are changed.

"Classifying the Materials Around Us" Materials Around Us PPT Courseware 3:

"Classification of Materials Around Us" Materials Around Us PPT Courseware 3 Materials and Environment Natural materials: refer to materials that are already available in nature and can be used directly without processing or basically without processing. Such as cotton, sand, stone, silk, coal, oil, iron ore, flax...

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Update Time: 2024-08-01

This template belongs to science courseware Third Grade Science Volume 1, Textbook Edition industry PPT template

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