"Wood" PPT courseware

Description

"Wood" PPT courseware

Part One Content: Learning Objectives:

1. Experience cooperation and communication in observation and experimental activities to explore the characteristics of wood.

2. Know that wood is a natural material and understand its properties and uses.

Self-study guide:

Observe the pictures and read the text to find the following questions on pages 40 and 41 of the textbook.

1. Application of wood in daily life

2. What are natural materials?

3. What are man-made materials?

Time: 3 minutes

"Wood" PPT courseware, part 2: raising questions

Students raise their own questions:

Does the wood have patterns and growth rings?

Can wood be burned?

Can wood conduct heat?

Does wood float or sink in water?

How soft and hard is the wood?

Can wood conduct electricity?

Design

Options include:

research questions

materials used

Research methods and processes

"Wood" PPT courseware, the third part: classroom experiment

Experimental exploration

Research Tips

During the experiment you should pay attention to:

1. Pay attention to safety and prevent injuries

2. Work together in groups, observe carefully, study and record at the same time.

3. Pay attention to the usage of the alcohol lamp: Use the external flame of the alcohol lamp (because the outer flame has the highest temperature). When extinguishing the alcohol lamp, cover it with the lamp cap.

Experimental results

Characteristics of wood

Wood has patterns (growth rings);

Wood is flammable;

Wood sinks and floats, the more it floats the less it sinks;

Wood has varying degrees of softness and hardness and is easy to carve;

Wood does not conduct heat easily;

Dry wood cannot conduct electricity, but wet wood can;

"Wood" PPT courseware, part 4: uses of wood

Make furniture (wardrobe, bed, dining table and chairs), build a house (beams, windows, doorways, etc.)

build a bridge

Lay rails as sleepers

decorative materials

Office supplies (desks, chairs)

Entertainment products (chess pieces, slides),

School supplies (pencils, paper products)

Some also have fragrances that can repel insects (such as camphor wood)

Some can make spices. For example, there is a ylang-ylang tree, which is called a "natural perfume tree"

Some can be used as Chinese medicinal materials. like ginkgo tree

It also has extremely high collection value. Such as golden nanmu, rosewood, plow wood

Wood is a natural material

What are natural materials?

Natural materials: (Grow naturally in nature and are large

Nature bestows treasures on mankind. ) such as: cotton, wood, bamboo,

Coal, petroleum and other non-synthetic materials.

What are man-made materials?

Man-made materials: (also called synthetic materials, they are materials artificially processed by chemical methods or polymerization of different natural substances.)

Such as plastic, artificial leather, artificial fiber and other synthetic materials.

"Wood" PPT courseware, part 5: cherish wood

1. Take good care of flowers, plants and trees; do not carve or write graffiti on trees.

2. Stop damage to trees when you see them.

3. Save paper in your daily study, because wood is the raw material for making paper.

4. Use something to replace wood. For example, wooden tables can be replaced with glass ones, thus saving wood...

Keywords: Qingdao edition fourth grade science PPT courseware free download, wood PPT download, .PPT format;

For more information about the "Wood" PPT courseware, please click on the "Wood ppt" tab.

"Wood" PPT download:

"Wood" PPT Download Part One: Warm Tips According to the content of your own research, determine the appropriate research methods and formulate a reasonable experimental plan. Choose experimental materials and tools. Conduct experimental research according to the plan and keep experimental records. be safe. ..

"Wood" PPT:

"Wood" PPT Part One: Exploring Questions Questions to be explored: 1. The texture of wood 2. Whether it can burn 3. The softness and hardness of wood 4. The sinking and floating in water 5. Can it conduct electricity 6. The heat conductivity of wood. .. ... ... "Wood" PPT, the second part of the content...

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Update Time: 2024-11-22

This template belongs to science courseware Qingdao Edition Fourth Grade Science Volume 1 industry PPT template

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